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Welcome to MathMeetings.net! This is a list for research mathematics conferences, workshops, summer schools, etc. Anyone at all is welcome to add announcements.

## Know of a meeting not listed here? Add it now!

#### Updates 2017-10

- Secure connections (https) now activated and all traffic is automatically redirected to use https. Thanks to Let's Encrypt for providing the certificate!
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- New json and xml interfaces for access by other software.

Additional update notes are available in the git repository (GitHub).

# Upcoming Meetings

## September 2018

### TRR195 "Symbolic tools in mathematics and their application" annual meeting

Meeting Type: conference

Contact: Hannah Markwig

### Description

The TRR 195 is a Collaborative Research Center of type Transregio established by the German Research Foundation DFG. It focuses on algorithmic and experimental methods in its five core research areas: group and representation theory; algebraic geometry, commutative and non-commutative algebra; tropical and polyhedral geometry; number theory; random matrix theory and free probability.

In addition to talks by the members of the TRR195, the conference will feature main talks by

Nils Bruin, Alicia Dickenstein, Derek Holt, Ion Nechita, Bernd Sturmfels.

## January 2019

### Birational Geometry and Moduli Spaces

Meeting Type: research program

Contact: see conference website

### Description

Birational Geometry and Moduli Spaces are two important areas of Algebraic Geometry that have recently witnessed a flurry of activity and substantial progress on many fundamental open questions. In this program we aim to bring together key researchers in these and related areas to highlight the recent exciting progress and to explore future avenues of research.

This program will focus on the following themes: Geometry and Derived Categories, Birational Algebraic Geometry, Moduli Spaces of Stable Varieties, Geometry in Characteristic p>0, and Applications of Algebraic Geometry: Elliptic Fibrations of Calabi-Yau Varieties in Geometry, Arithmetic and the Physics of String Theory

### Derived Algebraic Geometry

Meeting Type: research program

Contact: see conference website

### Description

Derived algebraic geometry is an extension of algebraic geometry that provides a convenient framework for directly treating non-generic geometric situations (such as non-transverse intersections in intersection theory), in lieu of the more traditional perturbative approaches (such as the “moving” lemma). This direct approach, in addition to being conceptually satisfying, has the distinct advantage of preserving the symmetries of the situation, which makes it much more applicable. In particular, in recent years, such techniques have found applications in diverse areas of mathematics, ranging from arithmetic geometry, mathematical physics, geometric representation theory, and homotopy theory. This semester long program will be dedicated to exploring these directions further, and finding new connections.

### Thematic month: Complex geometry

Meeting Type: conference

Contact: Erwan Rousseau, Andreas Höring

### Description

The last years have seen important developments in the understanding of the geometry of complex algebraic varieties, and more generally Kählerian varieties. This session will aim at gathering experts at an international scale on very active areas of research : birational geometry and Hodge theory, singular metrics, hyperbolicity, surfaces of general type. This will be an opportunity to encourage young researchers to get involved in these promising developments.

## February 2019

### Free Computational Mathematics

Meeting Type: conference

Contact: see conference website

### Description

The last decades have witnessed the emergence of a full ecosystem of open source software for (pure) mathematics, developed by overlapping international communities of researchers, teachers, engineers and amateurs. This ranges from specialized libraries (e.g. MPIR, LINBOX) to thematic systems (e.g. GAP, PARI, SINGULAR, xcas) to general purpose systems (e.g. Mathemagix, SAGE), via online databases (e.g. the OEIS, MATHHUB, or the LMFDB). This is part of the greater trend for Open and Reproducible Science, and is supported by the advancement of cross-discipline tools like the interactive computing environment JUPYTER. The involved communities are strong in Europe – specially so in France.

The main goal of this conference is community building and training :

- Bringing together the various communities of users and developers of the ecosystem of (open source) (pure) mathematics software.
- Give newcomers as well as experts an overview of this ecosystem : what the existing software systems are, what they can compute or solve, how they are developed and by whom, what the success stories and difficulties are.
- Train newcomers as well as experts on using this ecosystem to solve their own problems.
- Share perspectives and best practices, build a joint vision, and seek venues for tighter cooperation.
- Encourage participants to get involved, especially women and more junior researchers, in particular by showcasing role models.

This conference will also be the closing event of OpenDreamKit, an H2020 European E-Infrastructure project lead by the organizers, and the occasion to present its outcomes.

Following a long trend of highly productive workshops within the various communities (e.g. the SAGE Days series), this conference will consist of :

- five or six keynote talks delivering a variety of perspectives on the ecosystem.
- Hands-on tutorials run by experts of the various systems.
- Plenty of free time for interactions and collaborative work, self-organized through regular project planning sessions and progress reports

### Winter School on Enumerative Geometry and Modular Forms

Meeting Type: Winter School

Contact: see conference website

### Description

### Elliptic curves: arithmetic and computation

Meeting Type: CIMPA school

Contact: Valerio Talamanca

### Description

The aim of this is school to introduce the participants to the arithmetic and computational aspects of the theory of elliptic curves. Elliptic curves lie at the crossroads of algebra, analysis, geometry and arithmetic. We will develop the theory of elliptic curves from its very beginning also providing an introductory course on algebraic curves and the Riemann Roch theorem. Topics that will be covered include: basic geometric and arithmetic results for elliptic curves over number fields and over finite fields, the Mordell-Weil theorem for elliptic curves, Galois representations attached to elliptic curves,. and the Birch and Swinnerton Dyer Conjecture. On the computational side we will run six hours of training sessions on PARI/GP and SAGE.

### The Tenth International Conference on Matrix-Analytic Methods for Stochastic Models (MAM10)

Meeting Type: conference

Contact: Malgorzata O'Reilly

### Description

Matrix-Analytic Methods in Stochastic Models (MAM) conferences aim to bring together researchers working on the theoretical, algorithmic and methodological aspects of matrix-analytic methods in stochastic models and the applications of such mathematical research across a broad spectrum of fields, which includes computer science and engineering, telephony and communication networks, electrical and industrial engineering, operations research, management science, financial and risk analysis, bio-statistics, and evolution.

### Higher Dimensional Arithmetic Geometry

Meeting Type: conference

Contact: Sho Tanimoto

### Description

### Braids, Resolvent Degree and Hilbert’s 13th Problem

Meeting Type: conference

Contact: see conference website

### Description

Overview

HIL2019 web imageThe purpose of this workshop is to bring focused attention to Hilbert’s 13th problem, and to the broader notion of resolvent degree. While Abel’s 1824 theorem–that the general degree n polynomial is only solvable in radicals for n<4

is well known, less well known is Bring’s 1786 proof that a general quintic is solvable in algebraic functions of only one variable. Hilbert conjectured that for a general sextic, one needs algebraic functions of two variables, and that for a general degree 7 polynomial, one needs algebraic functions of three variables. More generally, it is natural to expect that as n → ∞ , so does the minimal number of variables needed to solve the general degree n polynomial. In a celebrated theorem, Arnol’d and Kolmogorov proved that, at the level of continuous functions, there is no local obstruction to reducing the number of variables to one. Thus, a resolution of Hilbert’s problem must lie deeper. Resolvent degree was introduced by Brauer in order to provide a rigorous statement of these conjectures. While no progress has yet been made on these conjectures, the study of resolvent degree is receiving renewed attention and an influx of ideas from related fields, including:

```
the theory of essential dimension
uniformization of moduli spaces
braid monodromy
p-adic Hodge theory
```

This workshop will bring together young and established researchers who work in these fields to explore topics related to Hilbert’s conjectures, to facilitate interaction between subdisciplines, and to lay the groundwork for future progress. The workshop will be organized around mini-courses by experts which will be aimed at 1) conveying the methods that can be brought to bear from each area, and 2) formulating problems concerning resolvent degree that seem particularly tractable using these methods.

### Spring 2019 Texas Geometry and Topology Conference

Meeting Type: conference

Contact: Efton Park, Greg Friedman

### Description

The spring 2019 meeting of the Texas Geometry and Topology Conference (TGTC) will be held on the campus of Texas Christian University (TCU) on February 22 – 24.

Speakers:

• Pierre Albin (University of Illinois)

• John Bryant (Florida State University)

• Robin Deeley (University of Colorado)

• Sherry Gong (UCLA)

• Craig Guilbault (University of Wisconsin-Milwaukee)

• Jo Nelson (Rice University)

• Marco Radeschi (Notre Dame)

• Ravi Shankar (University of Oklahoma)

Financial support is available to help defer the travel and living expenses of participants who do not have other funding sources. Requests for support must be received by February 1 to receive full consideration.

This meeting is supported by Texas Christian University, University of Texas at Arlington, and the National Science Foundation (DMS-1812040). Limited support is available. Graduate students, junior faculty, women, individuals from groups underrepresented in the mathematical sciences or from institutions with little federal support, and persons with disabilities are especially encouraged to participate and to apply for support.

There is no registration fee for the conference.

For more information and/or to register, go to the conference web site: http://faculty.tcu.edu/gfriedman/TGTC2019/index.html

### Midwest Topology Seminar Winter 2019

Meeting Type: conference

Contact: Dominic Culver, Vesna Stojanoska

### Description

Another installment of the Midwest Topology Seminar to be held at the University of Illinois, Urbana-Champaign. More details forthcoming.

### Mid Atlantic Series On Numbers (MASON III)

Meeting Type: conference

Contact: see conference website

### Description

Continuting the success of the MASON series of conferences, James Madison University will be hosting the third in the MASON series of conferences in February 2019.

The Mid-Atlantic Seminar On Numbers is a series of conferences in number theory held at colleges and universities in the Mid Atlantic region.

We are able to provide partial travel support for junior participants to attend the conference and are grateful to the National Science Foundation and the Number Theory Foundation for their support.

### Non-Archimedean Geometry and Applications

Meeting Type: conference

Contact: see conference website

### Description

### Algebraic and Analytic Aspects of Automorphic Forms

Meeting Type: school/workshop

Contact: see conference website

### Description

The theory of automorphic forms is one of the frontier areas in mathematics, which links diverse areas such as representation theory of real and p-adic groups, theory of L-functions, and modular forms.

The algebraic and analytic aspects of the theory of automorphic forms are at the basis of much of modern number theory. The algebraic theory of automorphic forms broadly comprises of the study of automorphic representations of adelic groups, their L-functions, and also the study of their local components. The theory of group representations for real, p-adic, and adelic groups, is an actively pursued area of research and plays a central role in modern number theory. In the analytic theory of automorphic forms, the study of L-functions is one of the most important topics, together with Fourier coefficients of modular forms.

The workshop will be from 25th of February to 1st of March, 2019, and the discussion meeting from 4th of March to 7th of March, 2019. The workshop will consist of the following 4 courses, each of 6 hours duration, with some extra time devoted to tutorials.

- Prof. Anna von Pippich (TU Darmstadt, Germany): “Theory of Eisenstein series”. Pippich will review the theory of Eisenstein series, and their significance in the spectral theory of automorphic forms.
- Prof. Ameya Pitale (University of Oklahoma, USA): “Siegel modular forms: Classical and adelic aspects”. Pitale will discuss Siegel modular forms, both from the classical viewpoint of functions on Siegel upper half spaces as well as the modern viewpoint of automorphic representations of the symplectic group.
- Prof. Vincent Sécherre (Université de Versailles, France): “ℓ-Modular representations of p-adic groups”. Sécherre will discuss the theory of smooth representations of p-adic groups with coefficients in an algebraically closed field of characteristic ℓ, where ℓ is different from 0 and p.
- Prof. Shunsuke Yamana (Kyoto University, Japan): “L-functions and theta correspondence for classical groups”. Yamana will discuss his paper Invent. Math. 196 (2014), no. 3, 651–732, beginning with an introduction to theta correspondence.

The discussion meeting will gather together several national and international speakers to get a sense of some of the current directions in this subject without making it overtly technical.

## March 2019

### Arizona Winter School: Topology and Arithmetic

Meeting Type: conference

Contact: see conference website

### Description

Speakers:

- Michael Hopkins
- Jacob Lurie
- Matthew Morrow
- Kirsten Wickelgren

### Workshop on Functor Calculus (OSU)

Meeting Type: workshop

Contact: Ernie Fontes, John E. Harper, Christina Osborne, Nath Rao

### Description

A weekend workshop on the Calculus of Functors (in its various flavors) at The Ohio State University in Columbus, Ohio.

The goal of the workshop is to expose the younger generation of researchers (graduate students, postdocs, and early-career researchers) to the ideas underlying functor calculus (in its various flavors) together with applications and new results in mathematics that have some connection or influence from this circle of ideas.

The first talk on Saturday (3/16) will begin at 8:30am, and the workshop will end on Sunday (3/17) at 1pm.

Invited talks:

- Tom Goodwillie (Brown)
- Michael Weiss (Muenster)
- Michael Ching (Amherst)
- Brenda Johnson (Union)
- John Klein (Wayne State)

Contributed talks:

- Jacobson Blomquist (Binghamton)
- Elden Elmanto (MSRI)
- Kyle Ferendo (Brown)
- Keely Grossnickle (Kansas State)
- Philip Hackney (Louisiana)
- Jens Kjaer (Notre Dame)
- Robin Koytcheff (Louisiana)
- Nick Kuhn (Virginia)
- Cynthia Lester (Oregon)
- Ayelet Lindenstrauss (Indiana)
- Apurva Nakade (Johns Hopkins)
- Peter Patzt (Purdue)
- Yuri Sulyma (UT Austin)
- Paul Tsopmene (Regina)
- David White (Denison)
- Sarah Yeakel (Maryland)

### Hawaii Number Theory 2019 (HINT)

Meeting Type: conference

Contact: see conference website

### Description

Hawaii Number Theory 2019 (HINT) aims to bring together a wide variety of number theorists to enhance collaboration and community. Right after HINT is the AMS Spring Central and Western Joint Sectional Meeting, also to be held at UH Mānoa. So come join us for a week of number theory in Hawaiʻi nei.

### International Conference on Arithmetic Geometry in honor of Michael Rapoport's 71st birthday

Meeting Type: conference

Contact: Guangqiang Tie

### Description

### Women in Homotopy Theory and Algebraic Geometry II

Meeting Type: workshop

Contact: Joana Cirici, Victoria Hoskins, Oliver Roendigs

### Description

This workshop is dedicated to the promotion of female researchers in the field of homotopy theory and algebraic geometry. The main aim of this workshop is to provide a platform for female researchers (ranging from graduate students to senior experts) to present their work in a friendly environment which stimulates future collaborations. Male participants are very welcome and encouraged to attend. Invited speakers are:

- Natàlia Castellana (Universitat Autònoma de Barcelona)
- Frances Kirwan (University of Oxford)
- Sarah Whitehouse (University of Sheffield)
- Susanna Zimmermann (Université d'Angers)

This workshop is supported by the German Research Foundation through the priority program SPP 1786.

### International Conference on Mathematics and Mathematics Education 2019

Meeting Type: conference

Contact: Ashwini Amarasinghe

### Description

The International Conference in Mathematics and Mathematics Education 2019 is a unique event where mathematicians and mathematics educators in Sri Lanka and around the world meet to discuss their research experience, share their knowledge, and collaborate.

Jointly organized by the Postgraduate Institute of Science, University of Peradeniya, together with the Ministry of Education, and the National Institute of Education, Sri Lanka, the ICMME 2019 will commence on the 22nd of March, 2019. Researchers and educators are encouraged to submit abstracts to be presented at the technical sessions, and to be published in the proceedings of the ICMME 2019.

### March Midwestern Microlocal Meeting; Microlocal Analysis, Inverse Problems and Resonances; A Conference in Honor of Plamen Stefanov

Meeting Type: conference

Contact: Kiril Datchev

### Description

The Third Midwestern Microlocal Meeting: Microlocal Analysis, Inverse Problems and Resonances will be held at Purdue University from March 22 to March 24, 2019. The meeting will celebrate Plamen Stefanov’s many contributions to the fields which make up the title of the event.

### Cohomology of Arithmetic Groups, Lattices and Number Theory: Geometric and Computational Viewpoint

Meeting Type: conference

Contact: see conference website

### Description

The cohomology of arithmetic groups sits squarely at the intersection of several fields of mathematics. For example, it connects to number theory and arithmetic geometry via Galois representations and Hecke operators, and to representation theory, via its relationship to automorphic forms and automorphic representations. It also has deep connections with geometry, topology, and algebra, through its connections with algebraic K-theory, locally symmetric spaces, reduction theory, and lattices. Explicit calculations have played an increasingly important role in the theoretical development of the subject and its applications. For example, explicitly computing the cohomology gives tools to formulate conjectures about automorphic forms and special values of L-functions, and to try to understand the increasing influence in number theory of the torsion in cohomology. As the scale and complexity of the calculations have increased it has become more and more common for such computations to be performed with the aid of computers. This CIRM conference will bring together international experts with diverse skill sets, and expertise in computational techniques relevant to such calculations and their applications to cohomology of groups, algebraic K-theory, arithmetic geometry, and lattices. The main goals are to foster new collaborations, to introduce young researchers to these topics, and to broaden our theoretical knowledge with a view to extending the scope of computer aided calculations in this area.

### Derived algebraic geometry and its applications

Meeting Type: conference

Contact: see conference website

### Description

This workshop will bring together researchers at various frontiers, including arithmetic geometry, representation theory, mathematical physics, and homotopy theory, where derived algebraic geometry has had recent impact. The aim will be to explain the ideas and tools behind recent progress and to advertise appealing questions. A focus will be on moduli spaces, for example of principal bundles with decorations as arise in many settings, and their natural structures.

### GATTACA: GeorgiA Tech Tropical, Arithmetic and Combinatorial Algebraic-geometry

Meeting Type: conference

Contact: see conference website

### Description

## April 2019

### Geometry at Infinity

Meeting Type: conference

Contact: Bernhard Hanke

### Description

This is the first of two international conferences representing the full scope of the DFG priority programme "Geometry at Infinity", a research network in differential geometry, geometric topology, and global analysis based at more than 20 German and Swiss universities. Organizers: Christian Bär (Potsdam), Bernhard Hanke (Augsburg), Anna Wienhard (Heidelberg), Burkhard Wilking (Münster).

### International Conference on Mathematical Methods in Physics

Meeting Type: conference

Contact: Zouhair Mouayn

### Description

The 2019 edition of ICMMP will honor the memory of Professor Ahmed Intissar. After obtaining his PhD at the Massachusetts Institute of Technology (MIT) in 1985, Professor Intissar returned to his native Morocco. Over the years, he supervised several PhD thesis, creating a school of mathematics which is worldwide recognized for fundamental contributions both in mathematics and mathematical physics. His students, friends and collaborators will always remember him for his teaching, his science and his charismatic personality.

The conference will bring together leading experts and research scholars to exchange and share their experience and research results on all aspects of mathematical physics and to promote transference of knowledge at the crossroads of mathematics and physics. There will be plenary sessions (30 to 45min), short talks and posters for student presentations. The scope of the conference will be quite broad, including in particular the following topics: polyanalytic function theory, harmonic analysis, representation theory and quantization, Clifford analysis and applications, coherent states, time-frequency analysis and wavelets, orthogonal polynomials, special functions and q-analogues, Hopf algebras and quantum groups, geometric mechanics and symmetry, exact solvable systems, Spectral theory and quantum systems. With the goal of encouraging communication and collaborative research between the participants, a feature of ICMMP2019 will be the inclusion of specific time-slots for scientific discussion.

### Talbot Workshop 2019

Meeting Type: workshop

Contact: see conference website

### Description

2019 TALBOT WORKSHOP: MODULI SPACES OF MANIFOLDS

Mentored by Soren Galatius and Oscar Randal-Williams

April 7-13, 2019

McCullough County, TX

The Talbot Workshop is a one week learning workshop for roughly 35 graduate students and a few postdocs. Most of the talks will be given by participants, and will be expository in nature. This year's workshop will survey the classical approach to analyzing moduli spaces of manifolds (via surgery theory and pseudoisotopy theory), but will focus on the more recent approach via cobordism categories, fiberwise surgery, and homological stability. It will also touch on a method recently introduced by Weiss exploiting embedding calculus. More details about the program, including a preliminary list of talks and references, can be found here:

http://math.mit.edu/conferences/talbot/

Applications close on Friday, February 1 at 11:59PM. You can apply online here:

http://math.mit.edu/conferences/talbot/index.php?pageID=application

Talbot is meant to encourage collaboration among young researchers, with an emphasis on graduate students. We also aim to gather participants with a diverse array of knowledge and interests, so applicants need not be an expert in the field--in particular, students at all levels of graduate education are encouraged to apply. As we are committed to promoting diversity in mathematics, we also especially encourage women and minorities to apply.

We will cover all local expenses including lodging and food. We also offer partial funding for participants' travel costs.

If you have any questions, please do not hesitate to e-mail the organizers at talbotworkshop (at) gmail.com.

Organizers: Calista Bernard, Yajit Jain, Morgan Opie, Sean Pohorence

### Hot Topics: Recent progress in Langlands Program

Meeting Type: conference

Contact: see conference website

### Description

The purpose of the workshop is to explain Vincent Lafforgue's ground breaking work, constructing the automorphic to Galois direction of the Langlands correspondence for function fields. There will also be a number of talks on more recent developments and related results.

### Derivators

Meeting Type: workshop

Contact: see conference website

### Description

### The fifth mini symposium of the Roman Number Theory Association

Meeting Type: conference

Contact: Fabrizio Barroero, Marina Monsurrò, Francesco Pappalardi, Valerio Talamanca, Alessandro Zaccagnini

### Description

This is a meeting organised by the Roman Number Theory Association.

The venue

The symposium will take place in the Arigiletum situated in Via Madonna dei Monti 40. This historical building host the Department of Architectures of Roma Tre University and is located nearby Via dei Fori Imperiali in the historical center of Rome.

### Geometric and Analytic Methods for Rational Points

Meeting Type: spring school

Contact: see conference website

### Description

This week is an introductory school to prepare junior participants for the 3-month thematic program "Reinventing rational points" at the Institut Henri Poincaré (April–July 2019). The study of rational points uses a rich mix of methods ranging from algebraic geometry to analytic number theory and has a constantly growing tool kit. The mini-courses will be an introduction to this broad area with an emphasis on new methods and developments. Among the themes to be covered are: Galois cohomology and arithmetic duality theorems; the Brauer group of an algebraic variety; the Brauer-Manin obstruction and descent obstructions to local-to-global principles for rational and integral points, and for zero-cycles; interactions of analytic number theory and geometry, applications of the circle method, sieve methods and additive combinatorics; rational points in families of varieties over local and global fields; new approaches to counting points and varieties. We plan to discuss the state of the art in the research on the Batyrev–Manin principle on the growth of rational points and the Colliot-Thélène conjecture on the Brauer–Manin obstruction, their versions, interrelations and generalisations.

### Reinventing Rational Points

Meeting Type: thematic program

Contact: see conference website

### Description

Rational points on algebraic varieties represent a modern way of thinking about one of the oldest problems in mathematics: integral and rational solutions of Diophantine equations. In arithmetic geometry one views rational points in the context of geometric properties of underlying algebraic varieties. In analytic number theory many different analytic techniques are used to count the number of rational or integral points, and so understand their “average” behaviour. In logic, rational points feature prominently in the work on Hilbert’s Tenth Problem over Q, which asks for an algorithm to decide the existence of rational solutions to all Diophantine equations. Here one searches for examples of “weird” or “far from average” behaviour of rational points.

There is a large body of conjectures that describe the behaviour of rational points. They include various versions of Mazur’s conjectures on the real topological closure of the set of rational points. A related circle of conjectures deals with the Brauer–Manin obstruction designed to describe the closure of the set of rational points inside the topological space of adelic points. It is conjectured that the Brauer–Manin obstruction should exactly describe this closure for certain classes of algebraic varieties such as rationally connected varieties, K3 surfaces and algebraic curves. Supportive heuristic and theoretical evidence for these difficult conjectures is slowly emerging from the work of many people. The Batyrev–Manin conjectures on the growth of rational points of bounded height have received much attention by analytic number theorists. New techniques that have revolutionised analytic number theory, such as additive combinatorics (Green, Tao, Ziegler) or arithmetic invariant theory (Bhargava, Gross), have made it possible to solve some of the long standing problems in arithmetic geometry. A new feature in recent years has been an increased interaction between the analytic and geometric thinking: questions motivated by various counting problems give rise to novel geometric ideas, whereas conjectures coming from geometry open up new fields of investigation for analytic number theorists.

The aim of this thematic period is to bring together senior and junior mathematicians from the various domains related to rational points to foster new interactions and new research.

### British Algebraic Geometry Meeting

Meeting Type: conference

Contact: Julius Ross

### Description

BrAG is an established series of regular meetings of British algebraic geometers. Our goal is to create a series that further strengthens the British algebraic geometry community, and that integrates postgraduate students and young researchers. The meetings will feature a number of pre-talks for graduate students, a poster session, and will include plenty of time for informal interactions between the participants.

### p-adic Langlands correspondence and Iwasawa theory

Meeting Type: conference

Contact: Julien Hauseux

### Description

The Langlands programme is a central theme in Number Theory, predicting the a deep connection between representations of the absolute Galois group of a local or a global field, and automorphic forms. The *p*-adic variant of this programme for the group GL(2) over the field of *p*-adic numbers has had some spectacular applications, such as the proof of the Fontaine-Mazur conjecture for GL(2) over the rationals.

At the heart of the Langlands programme lies the notion of *L*-function, whose order of vanishing at critical points is predicted by the famous Bloch-Kato conjecture in terms of the arithmetic of the Galois representation of the conjecturally attached motive. Iwasawa theory, in turn, seeks to relate the arithmetic of the restriction of this representation to the *p*-adic cyclotomic extension with the behaviour of a *p*-adic analytic *L*-function.

The purpose of this workshop is to gather experts of these topics as well as students and young researchers in order to present some recent advances and create scientific interactions and hopefully lead to future collaborations.

### 2019 Arches Topology Conference

Meeting Type: conference

Contact: Jeremy Brazas

### Description

This conference will focus on interactions between the algebraic topology and geometric group theory. NSF funding is expected to be available for lodging and travel travel expenses for graduate students and speakers without their own source of funding.

The 2019 meeting will be in Hurricane, UT, nestled closely between Zion National Park and Red Cliffs National Conservation Area. Regular talks will take place from 9 AM - 12 noon and the time from 12 noon to 8 pm will be free collaboration/discussion time in which you are welcome to explore the beautiful Zion National Park (also home to natural arches) and the surrounding area. The first three days will conclude with the evening plenary talks from 8-9 pm.

### 3rd International Congress: Algebra, Number Theory and Applications April 24-27, 2019 OUJDA MOROCCO

Meeting Type: conference

Contact: Abdelmalek Azizi, Abdelkader Zekhnini, Mohammed Taous

### Description

The purpose of this meeting is to introduce young researchers to some of the most attractive research areas of algebra, number theory and their applications, to present the latest contributions and achievements in these areas. This scientific event will be animated by great specialists as the Bourbaki group's member J. Osterlé and it will be dedicated, among others, to our former teachers : Dr. Ahmed Kerkour from Morocco and Dr. Gunther Frei from Switzerland.

### Simons Symposium: p-adic Hodge theory

Meeting Type: conference

Contact: see conference website

### Description

### Tropical Geometry: New Directions

Meeting Type: conference

Contact: see conference website

### Description

### Equidistribution: Arithmetic, Computational and Probabilistic Aspects

Meeting Type: conference

Contact: see conference website

### Description

This three-week program on equidistribution considers interactions between probability, number theory, computer science and mathematical logic.

An infinite sequence s(1), s(2), s(3), ... of real numbers is equidistributed (also called uniformly distributed) modulo 1 if the sequence formed by the fractional parts of each term is equidistributed in the unit interval, which means that for each subinterval of the unit interval, asymptotically, the proportion of terms falling within that subinterval is equal to its length. For instance, any sequence of independent identically distributed (i.i.d) random real variables is equidistributed modulo 1. We do not know whether the sequence of integral powers of e (or pi, log 2, root 2, etc.) is equidistributed modulo 1.

To determine whether a given sequence of real numbers is equidistributed and, if this is the case, to estimate the speed of convergence to equidistribution (discrepancy) are usually difficult questions. Lacunary sequences are those where the ratio of successive terms is bounded away from one. A particular family consists of the sequences where the ratio of successive terms is a constant integer greater than 1. These are of the form (b^k x)_k where x is a real and b is an integer greater than 1. These sequences are equidistibuted modulo 1 exactly when every block of digits in the base b expansion of x occurs with the same asymptotic frequency as every other block of equal length. Emile Borel called these real numbers x normal to base b. We know no example of a familiar mathematical constant which is normal to some integer base.

One challenge is to prove the existence of real numbers enjoying simultaneously prescribed digital and Diophantine approximation properties, a more daunting challenge is to give explicit examples of such numbers. In between, one can try to give computable constructions of them.

An analog of equidistribution occurs when using Monte-Carlo simulation with pseudo random numbers, many problems remain to be studied from the point of view of number theory and computer science.

## May 2019

### Definability and decidability problems in number theory

Meeting Type: conference

Contact: see conference website

### Description

This workshop, sponsored by AIM and the NSF, will be devoted to definability and decidability problems in number theory.

The main topics for the workshop are

- H10 and existential definability of Z for Q and big subrings of Q.
- Decidability of the first-order and the existential theory in finite and infinite algebraic extensions of Q. The workshop will bring together mathematicians working in algebraic geometry, number theory, model theory and computability theory to work on problems in decidability/computability and definability in number theory.
- Definability of valuation rings over infinite algebraic extensions of Q and over function fields.

The workshop will differ from typical conferences in some regards. Participants will be invited to suggest open problems and questions before the workshop begins, and these will be posted on the workshop website. These include specific problems on which there is hope of making some progress during the workshop, as well as more ambitious problems which may influence the future activity of the field. Lectures at the workshop will be focused on familiarizing the participants with the background material leading up to specific problems, and the schedule will include discussion and parallel working sessions.

### Recent Progress in Moduli Theory

Meeting Type: conference

Contact: see conference website

### Description

This workshop will be focused on presenting the latest developments in moduli theory, including (but not restricted to) recent advances in compactifications of moduli spaces of higher dimensional varieties, the birational geometry of moduli spaces, abstract methods including stacks, stability criteria, and applications in other disciplines.

### INdAM special research activity in Padova on "p-adic Langlands program"

Meeting Type: Special research bimester

Contact: see conference website

### Description

### 2nd Midwest Statistical Machine Learning Colloquium

Meeting Type: conference

Contact: Hieu Pham

### Description

This one-day regional meeting of statisticians, engineers, computer scientists, mathematicians, and practitioners interested in the theory and applications of Statistical Machine Learning is being organized by the ISU Departments of Industrial & Manufacturing Systems Engineering and of Statistics. The purpose of the meeting is to bring together a diverse set of researchers and practitioners from multiple disciplines to discuss current motivating problems and methodological advances in theory-based machine learning.

There was excellent attendance and a stimulating program at the inaugural Colloquium in 2018 and our intention is to follow the same format. The Colloquium will be a single-track event with six invited plenary presentations by top experts from Midwestern universities and research organizations, with an additional substantial poster session.

### Curves and groups in families

Meeting Type: summer school

Contact: see conference website

### Description

This conference will gather researchers and students around two important topics in mixed and characteristic p geometry : the computation of stable models of curves, and the geometry of groups and torsors in characteristic p.

### Knots and Braids in Norway

Meeting Type: Workshop

Contact: Rachael Boyd, Tara Brendle, Markus Szymik

### Description

Dear colleagues,

we are excited to announce a school and workshop

```
Knots and Braids in Norway (KaBiN)
```

to be held at NTNU Norwegian University of Science and Technology in Trondheim from May 13 to 17, 2019.

This meeting aims to bring together people with varying points of view who are interested in knots and braids. The school is aimed at Ph.D. students and will cover algebraic aspects and moduli spaces of knots. The workshop will give glimpses into current research directions. We plan for the schedule to allow ample time for discussions and collaboration among participants.

The school consists of two lecture series by:

```
Ryan Budney (University of Victoria)
Alissa Crans (Loyola Marymount University)
```

The current list of confirmed workshop speakers is:

```
Corey Bregman (Brandeis University)
Celeste Damiani (University of Leeds)
Kim Frøyshov (University of Oslo)
Richard Hepworth (University of Aberdeen)
Victoria Lebed (Université de Caen Normandie)
Arnau Mortier (Dublin City University)
Mark Powell (Durham University)
Arunima Ray (Max-Planck-Institut für Mathematik Bonn)
Arthur Soulié (Université de Strasbourg)
```

All interested to come should register via the website, indicating if they would like to contribute and if they need financial support. Priority will be given to graduate students, recent PhDs, and underrepresented minorities. Funds from the project "Pure Mathematics in Norway" of the Bergen Research Foundation with the collaboration of the Tromsø Research Foundation support this event.

The deadline is January 31, 2019. Please apply as early as possible to facilitate our planning process.

https://sites.google.com/view/knots-and-braids-in-norway/home

Best regards,

the organisers

Rachael Boyd (NTNU) Tara Brendle (University of Glasgow) Markus Szymik (NTNU)

### The p-adic Langlands programme and related topics

Meeting Type: workshop

Contact: Eran Assaf, Ana Caraiani, Fred Diamond, James Newton

### Description

The aim of the workshop is to bring together researchers working on a range of topics in and around the local and global p-adic Langlands program. The event is funded by the ERC and the EPSRC, and is being organised as a joint activity of the “p-adic Arithmetic Geometry, Torsion Classes, and Modularity” ERC grant, and the "Langlands Programme - p-adic and Geometric Methods" EPSRC grant.

Limited funding is available to support early career researchers with travel and accommodation. Please email the organisers for more information.

### Midwest Topology Seminar Spring 2019

Meeting Type: conference

Contact: Teena Gerhardt, Gabe Angelini-Knoll

### Description

### Arithmetic of Function Fields and Diophantine Geometry

Meeting Type: conference

Contact: see conference website

### Description

This conference is aimed at bringing together both established and junior number theorists from across the globe, and especially researchers in Function Field Arithmetic, Diophantine Geometry, and related topics, to discuss the state of the art in mathematics and to encourage further research collaborations in these areas. We will further use this opportunity to honor Professor Jing Yu, on the occasion of his retirement, for his fundamental contributions to the development of function fields over the past 4 decades.

### p-adic Modular Forms and p-adic L-functions

Meeting Type: conference

Contact: see conference website

### Description

Modular forms and L-functions have played a central role in Number Theory in the last decades: they have been the source of inspiration for several central conjectures that have been the fuel of the research since they have been formulated up to now. Between them, the Birch and Swinnerton-Dyer conjecture and the Riemann Hypothesis, two of the six still open problems of the Millennium Prize Problems set by the Clay Mathematics Institute, Hilbert’s Twelfth and Nine Problem, the Stark’s conjectures and other important related conjectures such as the Main Conjectures of Iwasawa theory and Leopoldt’s conjecture. They also provide key insights towards deep elementary conjectures in Number Theory. An emblematic example is Fermat’s Last Theorem, which states that there are no positive integers a, b, and c satisfying the equation aⁿ+bⁿ=cⁿ for n≥3, proved by A. Wiles. It was the result of the efforts of several mathematicians which had the insight to apply the theory of elliptic curves, modular forms and Galois representations to this problem.

As explained, these conjectures are very deep and modular forms and L-functions appear sometime in an amazing way. Another unexpected feature of them is that they present p-adic analogues which can be approached and, sometime, even imply instances of the original conjectures. The aim of the conference is to join together mathematicians working on two fundamental arithmetic aspects of the theory, namely p-adic modular forms and p-adic L-functions, and report on the most recent developments and impact that these results have on the above mentioned conjectures. The conference will take place from May 20 to May 24, 2019.

### Rational points on Fano and similar varieties

Meeting Type: conference

Contact: see conference website

### Description

### The 9th International Workshop on Differential Equations and Applications

Meeting Type: workshop

Contact: See workshop website

### Description

It is our pleasure to invite you to participate in “The 9th International Workshop on Differential Equations and Applications” which will be organized by Department of Mathematics of both Dokuz Eylül University and Yeditepe University and held in Doğa Holiday Village, İstanbul on May 24-26, 2019. The scope of the conference is to bring together members of the mathematical community whose interest lies in applied mathematics to assess new developments, ideas, and methods. The conference will cover a wide range of topics of

DIFFERENTIAL EQUATIONS, DIFFERENCE EQUATIONS, DYNAMIC EQUATIONS, STOCHASTIC DIFFERENTIAL EQUATIONS,

and all other fields of applied mathematics. There is no application fee to attend the workshop.

### Homotopy meets homology

Meeting Type: workshop

Contact: Vladimir Dotsenko

### Description

Computing various homological invariants of associative algebras (such as Tor and Ext of various modules, Hochschild (co)homology, cyclic homology etc.) has been an active research topic in ring theory for many years. More recently (about 15 years ago), ring theorists became interested in associative algebras up to homotopy, or A-infinity algebras, as a recipe to produce meaningful "higher structures" on classical objects like Yoneda Ext-algebras.

This offers two different perspectives on associative algebras: homological invariants are "Abelian" (i. e. arise when one works with additive categories, e.g. chain complexes of modules over a ring), while homotopical invariants are "non-Abelian" (i. e. arise from non-additive categories, like the category of all differential graded associative algebras). However, these two perspectives are closely related, and it is often possible to recover homological information from the homotopical one, and the other way round. For experts in homotopical algebra on a larger scale (beyond the associative ring theory), this philosophy is already present in works of Stasheff and Hinich on homotopy algebras.

The goal of this workshop is to provide a forum for experts in related areas to share ideas with each other and with younger researchers, identify new promising connections and explore arising research directions.

### p-arithmetic of automorphic forms: a conference in honour of Jacques Tilouine

Meeting Type: conference

Contact: Boyer Pascal, Conti Andrea, Mokrane Farid

### Description

Introduced at the end of the 1960s, the Langlands Program, whose inspiration comes from class field theory in the early 20th century, has produced spectacular and numerous results in the last 20 years.

The most efficient techniques include the intensive use of families of p-adic automorphic forms and the study of deformations of Galois representations. They have led to remarkable arithmetic applications such as the proofs of the Artin conjecture for GL(2) and of the Sato-Tate theorem.

On the occasion of the 60th birthday of J. Tilouine, we gather some of the best experts whose research interacts with those of Jacques.

### Souriau 2019

Meeting Type: Conference

Contact: Jean-Jacques Szczeciniarz, Patrick Iglesias-Zemmour

### Description

In May 1969 the groundbreaking book of Jean-Marie Souriau appeared, __Structure des Systèmes Dynamiques__. We will celebrate, in 2019, the jubilee of its publication, with a conference in honour of the work of this great scientist. The subjects are : *Symplectic Geometry/Mechanics*, *Relativity and Cosmology*, *Geometric Quantization*, *Diffeology*, and anything related to these domains.

### Integrable Probability summer school

Meeting Type: summer school

Contact: Leonid Petrov

### Description

The NSF funded Focused Research Group on Integrable Probability is organizing a Summer School at University of Virginia, May 27 to June 8, 2019. The school is aimed to educate graduate students and young researchers in recent trends around Integrable Probability - a rapidly developing field at the interface of probability / mathematical physics / statistical physics on the one hand, and representation theory / integrable systems on the other.

There will be 4 mini-courses:

Week 1 - Dmitry Chelkak (École Normale Supérieure, Paris, France) - Ole Warnaar (University of Queensland, Brisbane, Australia) Week 2 - Tomohiro Sasamoto (Tokyo Institute of Technology, Tokyo, Japan) - Paul Zinn-Justin (University of Melbourne, Melbourne, Australia)

We have some NSF support to cover accommodation at a University of Virginia residence hall, and to partially contribute towards travel expenses (the travel support amount depends on the number of interested participants). Preference will be given to graduate students, postdocs, early career researchers, and members of underrepresented groups.

Deadlines: - To request residence hall accommodation: January 5, 2019 - To request financial support: March 1, 2019 - General registration: April 20, 2019

More information and registration: http://vipss.int-prob.org/

Scientific Committee: Jinho Baik, Alexei Borodin, Ivan Corwin, Vadim Gorin, Leo Petrov

Organizers: Leo Petrov, Axel Saenz

### Padova school on Serre conjectures and the p-adic Langlands program

Meeting Type: Spring school

Contact: see conference website

### Description

### Thematic Program in Commutative Algebra and its Interaction with Algebraic Geometry

Meeting Type: undergraduate school, graduate school, conference

Contact: see conference website

### Description

In the Summer 2019, there will be a four-week long Thematic Program in Commutative Algebra and its Interaction with Algebraic Geometry, on the occasion of Bernd Ulrich’s 65th birthday. It will be held at the Center for Mathematics of the University of Notre Dame from Tuesday, May 28 until Friday, June 21, 2019. The organizers of the program are Craig Huneke, Sonja Mapes, Juan Migliore, Claudia Polini, and Claudiu Raicu.

- Undergraduate school Tuesday, May 28–Saturday, June 1, 2019 3 courses with afternoon exercise sessions
- MSRI graduate school and Macaulay2 workshop Monday June 3– Friday June 14, 2019 4 courses with exercise sessions plus a Macaulay2 workshop
- International conference in honor of Bernd Ulrich Sunday June 16–Friday June 21, 2019 4 talks per day (2 in the morning, 2 in the afternoon) 30 minutes Q&A each day (only for peridoctoral students) two poster sessions

## June 2019

### Arithmetic of low-dimensional abelian varieties

Meeting Type: conference

Contact: Andrew V. Sutherland

### Description

In this workshop, we will explore a number of themes in the arithmetic of abelian varieties of low dimension (typically dimension 2--4), with a focus on computational aspects. Topics will include the study of torsion points, Galois representations, endomorphism rings, Sato-Tate distributions, Mumford-Tate groups, complex and p-adic analytic aspects, L-functions, rational points, and so on. We also seek to classify and tabulate these objects, in particular to understand explicitly the underlying moduli spaces (with specified polarization, endomorphism, and torsion structure), and to find examples of abelian varieties exhibiting special behavior. Finally, we will pursue connections with related areas, including the theory of modular forms, related algebraic varieties (e.g., K3 surfaces), and special values of L-functions.

Our goal is for the workshop to bring together researchers working on abelian varieties in a number of facets to establish collaborations, develop algorithms, and stimulate further research.

### Nielsen Theory and Related Topics

Meeting Type: conference

Contact: Karel Dekimpe

### Description

We are pleased to announce the next edition of the conference on

**Nielsen Theory and Related Topics**

which will be held at Kortrijk (Belgium) from June 3 to June 7, 2019.

On the first day of the conference there will be special lectures, aimed at non-specialists, by

Iván Sadofschi Costa (Universidad de Buenos Aires, Argentina) Tatiana Fomenko (Moscow State University, Russia) John Guaschi (Université de Caen Normandie, France) Kate Ponto (University of Kentucky, United States of America)

Other participants will have the opportunity to submit a proposal for a short talk to the scientific committee. The organizers especially want to encourage young researchers to present their work during this meeting.

This and other information is now available at the conference's homepage http://www.kuleuven-kulak.be/nielsen

### Representation Theory and D-modules

Meeting Type: conference

Contact: Michel Gros, Thierry Levasseur, Tobias Schmidt

### Description

The interplay between D-modules and representation theory has became one of the key features in representation theory in the recent years. The aim of the conference is to report on recent progress and to present some new directions concerning this relationship, especially those motivated by applications to the p-adic and to the geometric Langlands program.

### Summer school: Geometric representation theory and low-dimensional topology

Meeting Type: summer school

Contact: Dan Freed, David Jordan, Peter Samuelson, Olivier Schiffmann

### Description

In recent years, several independent research groups have raised the possibility of a unified approach to the study of Khovanov-Rozansky knot homology, double affine Hecke algebras and elliptic Hall algebras, super Yang-Mills theory, Betti quantum geometric Langlands, and Hilbert schemes, seen through the lens of character varieties and related geometries. The aim of this workshop is to bring together researchers in topological field theory, geometric representation theory, mathematical physics, and algebraic combinatorics to report on recent progress and open questions at the intersection of these fields.

The conference will be preceded by a week-long summer school aimed at graduate and post-doctoral researchers, with the goal to initiate them to the ideas needed to follow the talks the following week. There will be an application process for this, and funding is available to cover the lodging for summer school participants for the duration of both events. We have addtional supplementary NSF funding for the travel costs of US-based summer school participants.

**Summer school speakers:**

Tina Kanstrup, Univeristy of Bonn

Pavel Safronov, University of Zurich

Hiro Lee Tanaka, Texas State University

Monica Vazirani, UC Davis

**Conference speakers:**

Mina Aganagic, UC Berkeley (*)

Adrien Brochier, University of Paris 7, Diderot

Ivan Cherednik, University of North Carolina

Tudor Dimofte, UC Davis

Pavel Etingof, MIT

John Francis, Northwestern University

Tamas Hausel, IST Vienna

Lotte Hollands, Heriot-Watt University

Anton Kapustin, Caltech

Anton Mellit, University of Vienna

Andrei Negut, MIT

Alexei Oblomkov, UMass Amherst

Tony Pantev, U Penn

Du Pei, Caltech

Pavel Safronov, University of Zurich

L. Schaposnik, University of Illinois, Chicago

Claudia Scheimbauer, NTNU Trondheim

Noah Snyder, Univeristy of Indiana, Bloomington

Constantin Teleman, UC Berkeley

Harold Williams, UC Davis

Dimitri Wyss, IST Vienna

(*) To be confirmed.

### INTERACTIONS BETWEEN REPRESENTATION THEORY, ALGEBRAIC TOPOLOGY AND COMMUTATIVE ALGEBRA (IRTATCA)

Meeting Type: Research programme

Contact: Varela,Pau

### Description

**Presentation**
The CRM and IMUB are pleased to announce the follow-up programme for the IRTATCA: Interactions between Representation Theory, Algebraic Topology and Commutative Algebra intensive research programme that was held in 2015 at the CRM. The program and its follow-up are devoted to promote interactions between researchers from different areas that share a common interest in homological techniques in a broad sense. The original programme gathered around 200 researchers from all over the world, and it is now time to have a look at some of the progress that took place since then.

These two weeks will be structured around one Advanced Course between the 3rd and 7th of June 2019, that will take place at the IMUB and a Conference between the 11th and the 15th of June 2019 that will take place at the CRM.

**Topics**
The programm is open to all researchers interested in homological algebra and its applications in areas like commutative algebra, representation theory and algebraic topology. This includes but is not restricted to: the study of triangulated categories, derived algebraic geometry, homotopy theory, singularity theory, representation theory, etc.

### Early Career Topology Researchers

Meeting Type: conference

Contact: Jordan Williamson, Dan Graves

### Description

A two-day conference primarily aimed at postgraduate students and post-docs working in all areas of topology with a focus on homotopy theory and applied topology.

Invited speakers:

Constanze Roitzheim (Kent)

Ran Levi (Aberdeen)

### Arithmetic, Geometry, Cryptography and Coding Theory

Meeting Type: conference

Contact: see conference website

### Description

Our goal is to organize a conference devoted to interactions between pure mathematics, in particular arithmetic and algebraic geometry, and the information theory, especially cryptography and coding theory. This conference will be the seventeenth edition, with the first one held in 1987, that traditionally reunites some of the best specialists in the domains of arithmetic, geometry and information theory. The corresponding international community is very active with all of the concerned domains changing rapidly over time.

The conference is thus an important occasion for young mathematicians (graduate students and post-docs) to interact with established researchers in order to exchange new ideas.

The conference talks will be devoted to recent advances in arithmetic and algebraic geometry, and number theory, with a special accent on algorithmic and effective results and applications of these fields to the information theory.

The conference will last one week and will be organized as follows :

- One or two plenary talks per day at the beginning of each session. They will be given by established researchers, some of them new to the established AGC2T community, so that that new emerging topics can be introduced, that may give rise to new applications of arithmetic or algebraic geometry to the information theory.
- Shorter specialized talks, often delivered by young mathematicians.

As with the previous editions of the AGC2T, we would like to publish the acts of the conference as a special volume of the Contemporary Mathematics collection of the AMS.

Conference Topics

- Number theory, asymptotic properties of families of global fields, arithmetic statistics, L-functions.
- Arithmetic geometry, algebraic curves over finite fields or number fields, abelian varieties : point counting, the invariant theory and classification of curves.
- Coding theory, algebraic-geometric codes constructed from curves and higher dimensional varieties, decoding algorithms. - Cryptography, elliptic curves and abelian varieties : the discrete logarithm problem, pairings, explicit computation of isogenies, multiplication over finite fields, APN functions, bent and hyper-bent funtions.

### Conference - Geometric representation theory and low-dimensional topology

Meeting Type: conference

Contact: Dan Freed, David Jordan, Peter Samuelson, Olivier Schiffmann

### Description

In recent years, several independent research groups have raised the possibility of a unified approach to the study of Khovanov-Rozansky knot homology, double affine Hecke algebras and elliptic Hall algebras, super Yang-Mills theory, Betti quantum geometric Langlands, and Hilbert schemes, seen through the lens of character varieties and related geometries. The aim of this workshop is to bring together researchers in topological field theory, geometric representation theory, mathematical physics, and algebraic combinatorics to report on recent progress and open questions at the intersection of these fields.

The conference will be preceded by a week-long summer school aimed at graduate and post-doctoral researchers, with the goal to initiate them to the ideas needed to follow the talks the following week. There will be an application process for this, and funding is available to cover the lodging for summer school participants for the duration of both events. We have addtional supplementary NSF funding for the travel costs of US-based summer school participants.

**Summer school speakers:**

Tina Kanstrup, Univeristy of Bonn

Pavel Safronov, University of Zurich

Hiro Lee Tanaka, Texas State University

Monica Vazirani, UC Davis

**Conference speakers:**

Mina Aganagic, UC Berkeley (*)

Adrien Brochier, University of Paris 7, Diderot

Ivan Cherednik, University of North Carolina

Tudor Dimofte, UC Davis

Pavel Etingof, MIT

John Francis, Northwestern University

Tamas Hausel, IST Vienna

Lotte Hollands, Heriot-Watt University

Anton Kapustin, Caltech

Anton Mellit, University of Vienna

Andrei Negut, MIT

Alexei Oblomkov, UMass Amherst

Tony Pantev, U Penn

Du Pei, Caltech

Pavel Safronov, University of Zurich

L. Schaposnik, University of Illinois, Chicago

Claudia Scheimbauer, NTNU Trondheim

Noah Snyder, Univeristy of Indiana, Bloomington

Constantin Teleman, UC Berkeley

Harold Williams, UC Davis

Dimitri Wyss, IST Vienna

(*) To be confirmed.

A website with up to date information is available at:

Conference: http://www.icms.org.uk/geometricrepresentation.php Summer school: http://www.icms.org.uk/GRTsummerschool.php

Applications for the summer school can be made from now until February 28th, 2019. Registration for the conference will begin January 15th, and run until February 28th; we'll send a reminder announcement at that time. Please feel free to email the organizers, at djordan@ed.ac.uk, in the meantime with any questions, or to let us know your intent to register.

For both events, the organizers are committed to a fair gender balance and to hosting a diverse body of participants. Members of under-represented groups are especially encouraged to apply to participate.

We hope to see you there, Dan Freed David Jordan Peter Samuelson Olivier Schiffmann

### Ideals, Varieties, Applications: Celebrating the Influence of David Cox

Meeting Type: conference

Contact: see conference website

### Description

### LG&TBQ: a conference in geometry, topology, and dynamics on the work of LGBTQ+ mathematicians.

Meeting Type: conference

Contact: Autumn Kent, Harrison Bray

### Description

LG&TBQ is a conference aiming to to foster ongoing community and collaboration among LGBTQ+ mathematicians working in geometry, topology and dynamical systems. All are welcome.

### PIMS Workshop on Arithmetic Topology

Meeting Type: conference

Contact: see conference website

### Description

The last 10 years have brought a burst of activity at the intersection of algebraic topology, number theory and algebraic geometry. This has led to a wealth of: New theorems, such as Ellenberg–Venkatesh–Westerland’s breakthrough results on the Cohen–Lenstra heuristics for function fields; New sources of heuristics in topology, such as Vakil–Wood’s predictions from the Grothendieck ring, or the notion and coincidences of homological densities as in Farb– Wolfson–Wood; Refinements of classical enumerative theorems using modern topological tools, such as Kass–Wickelgren’s arithmetic count of the 27 lines on a cubic surface; and A renewed focus on unstable homology, as in Galatius–Kupers–Randal-Williams and Miller–Wilson. We believe that these results are just the beginning of the emerging area of arithmetic topology.

This 5 day workshop will bring together junior and senior researchers from across these areas with the goal of:

```
Giving participants a global view of a fast emerging and multidisciplinary area,
Giving participants a detailed awareness on the range of methods available, and
Emerging with a robust problem list which can help guide activity in the area for the next 5-10 years.
```

### Geometry and Arithmetic of Algebraic Varieties

Meeting Type: conference

Contact: see conference website

### Description

### Explicit methods in arithmetic geometry in characteristic p

Meeting Type: conference

Contact: see conference website

### Description

The AMS’s Mathematics Research Communities (MRC) are a professional development program offering early-career mathematicians a rich array of opportunities to develop collaboration skills, build a network focused in an active research domain, and receive mentoring from leaders in that area. Funded through a generous three-year grant from the National Science Foundation, MRC is a year-long experience that includes:

```
Intensive one-week, hands-on research conferences in the summer;
Special Sessions at the AMS-MAA Joint Mathematics Meetings in the January following the summer conferences;
Guidance in career building;
Follow-up small-group collaborations;
Longer-term opportunities for collaboration and community building among the participants;
```

Over time, each participant is expected to provide feedback regarding career development and the impact of the MRC program.

Women, underrepresented minorities, and individuals from various types of institutions across the country are all encouraged to apply.

The focus of this MRC will be on problems in arithmetic geometry over fields of positive characteristic p that are amenable to an explicit approach, including the construction of examples, as well as computational exploration. Compared to algebraic geometry in characteristic 0, studying varieties over fields of characteristic p comes with new challenges (such as the failure of generic smoothness and classical vanishing theorems), but also with additional structure (such as the Frobenius morphism and point-counts over finite fields) that can be exploited. This often leads to interesting arithmetic considerations: possible topics for the workshop include isogeny classes of abelian varieties over finite fields, Galois covers of curves and lifting problems, and arithmetic dynamics.

To reflect the inherent interdisciplinary nature of arithmetic geometry, we invite early-career mathematicians with a wide range of backgrounds in number theory, algebraic geometry, and other subjects that intersect these fruitfully, such as dynamics and commutative algebra. During the workshop, the participants will formulate and investigate open problems around areas of current interest in small collaborative groups. They will benefit from the mentorship of a diverse group of senior arithmetic geometers, and from activities tailored to junior researchers. For instance, there will be two problem brainstorming sessions (at the beginning and the end), expository talks on key techniques (such as recent computational advances), and career-related group discussions.

### p-adic dynamics of Hecke operators

Meeting Type: conference

Contact: see conference website

### Description

The study of symmetries, starting with Klein and Hilbert in the late 19th century is of central importance to number theory. One is interested in behaviour of points in a space under its group of "generalized symmetries"; this idea is central to theories such as ergodic theory and dynamical systems that originated with problems in physics, but also to number theory where the symmetries are very much related to Diophantine equations. Mostly this study is done on manifolds in the usual Euclidean space that takes its structure from the usual space in which we live; however, number theory provides us with new exotic spaces and new exotic geometries -- p-adic numbers, p-adic analysis, p-adic manifolds -- that in a certain perspective serve as tools to study local behaviour of complicated global symmetries originating in Euclidean spaces. Our interest is precisely in developing such a theory in the context of very particular spaces and symmetries; to be precise, p-adic Shimura varieties and p-adic Hecke operators.

### 17TH SCHOOL ON INTERACTIONS BETWEEN DYNAMICAL SYSTEMS AND PARTIAL DIFFERENTIAL EQUATIONS (JISD2019)

Meeting Type: Summer School

Contact: see conference website

### Description

Presentation

The "School on Interactions between Dynamical Systems and Partial Differential Equations" is an international summer school that has taken place at the Facultat de Matemàtiques i Estadística of the Universitat Politècnica de Catalunya (UPC) every summer since 2002. Since 2017 it has taken place at the Centre de Recerca Matemàtica. It is an annual meeting between scientists dedicated to Dynamical Systems and/or to PDEs to exchange knowledge and methods which may help to study new leading border problems in these two fields of mathematics. The conference is aimed at researchers from any country, as well as at local researchers. It consists of four advanced courses of about 6 hours each, complemented by some seminar talks as well as communications and posters by young attending researchers.

JISD former editions

Lecturers

Maria Colombo, École Polytechnique Fédérale de Lausanne, Switzerland

Gérard Iooss, Université Côte d'Azur and IUF, France

Yannick Sire, Johns Hopkins University, EEUU

Chongchun Zeng, Georgia Institute of Technology, EEUU Organizing Committee

Xavier Cabré ICREA and Universitat Politècnica de Catalunya Gyula Csato BGSMath and Universitat Politècnica de Catalunya Amadeu Delshams Universitat Politècnica de Catalunya Marcel Guàrdia Universitat Politècnica de Catalunya Tere M. Seara Universitat Politècnica de Catalunya Scientific Committee

Scott Amstrong Université Paris - Dauphine Jean Pierre Eckmann Université de Genève Jean-Michel Roquejoffre Paul Sabatier University Susanna Terracini Università de Torino

Poster session

If you wish to present a poster, please submit the following form before April 7th, 2019. Resultions will be send before April 29th, 2019.

Please note that submitting a proposal does not exempt the applicant from having to register to the school.

Application form

Grants

- Only applications from pre-registered participants will be accepted

In order to increase the number of young researchers participating in this activity, the CRM announces a call for those participants interested in taking part in this activity. This grant includes a reduced registration fee and housing in a shared apartment on campus from June 16th to June 22nd, 2019.

Application Form

Application deadline for grants: April 7th, 2019 (Resolutions will be sent before April 29th)

EMS:

The EMS offers some travel grants to young mathematicians from less-favoured regions within the geographical area of EMS membership for presenting results at conferences or attending courses, or for research stays in foreign countries, normally up to a maximum of 900 euros in each case or 500 euros for trips within Europe.

Eligible researchers should use this online form in order to apply for travel grants.

Registration

Early bird registration fee: 250€ (until May 19th, 2019) Regular registration fee: 300€

Deadline for registration: June 2nd, 2019 Registration includes: Documentation package, coffee breaks and lunches.

Refund policy: The registration fee depends on the date of the payment. Cancellations received 1 month before the start of the activity will incur in an administrative fee of 50% of the total amount. Cancellations received less than one month prior to the start of the activity are not refundable.

You will be able to pay by card or bank transfer through the on-line registration system.

### Arithmetic, geometry, and modular forms: a conference in honour of Bill Duke

Meeting Type: conference

Contact: see conference website

### Description

### Microlocal Analysis and Applications

Meeting Type: conference

Contact: Jared Wunsch

### Description

Microlocal analysis originated in the 1950s from the use of Fourier transform techniques in the study of variable-coefficient PDEs; its intellectual roots lie in geometric optics and the WKB approximation. The field took on a coherent identity starting in the 1960s with the development of pseudodifferential and, later, Fourier integral operators as fundamental tools. Since then, microlocal analysis has seen a remarkable variety of applications across pure and applied mathematics and physics. Within the last several years, the field has witnessed both striking breakthroughs on known microlocal problems and spectacular new results in areas where microlocal analysis had not previously been viewed as a natural tool. The conference will explore applications in areas as diverse as inverse problems, general relativity, classical dynamics, and quantum chaos, and should be of interest to researchers in many areas of PDE, geometry, and mathematical physics.

The conference will be preceded by a two-day minicourse on June 14-15, aimed at postdocs and advanced graduate students, offering a crash mini-course in the foundations of microlocal analysis, as well as an introduction to its applications in inverse problems, spectral theory, and evolution equations.

his event is funded by the China National Natural Science Foundation and the Shanghai Center for Mathematical Sciences. Some financial support for lodging will be available for junior participants. Some funding is available from the US NSF for partial support of travel and lodging for junior US participants. Priority for support will be given to graduate students and recent PhDs. Women mathematicians and members of other under-represented groups are especially encouraged to apply for support.

### Arithmetic Geometry in Carthage

Meeting Type: Summer School (June 17-21, 2019) & Conference (June 24-28, 2019)

Contact: Ahmed Abbes

### Description

A two week program on arithmetic geometry will take place in Carthage in the city of Tunis (Tunisia), from June 17 to 28, 2019. It will focus on a number of areas of important progress over the last three or four years notably: p-adic Hodge theory; p-adic Langlands program; ramification of étale l-adic sheaves; special values of L functions and automorphic and motivic periods and Conjectures of Deligne, Beilinson, Gan-Gross-Prasad.

The first week will be devoted to a summer school and the second week to a conference. The summer school will take place from June 17 to 21, 2019. It will consist of 5 courses of three hours each and few lectures by junior researchers on topics close to the courses. The conference will take place from June 24 to 28, 2019. It will consist of 20 lectures. Registration on the web is mandatory both for the Summer School and the Conference.

### Biology, Analysis, Geometry, Energies, Links: A Program on Low-dimensional Topology, Geometry, and Applications

Meeting Type: 1 week summer school followed by 1 week workshop

Contact: Simon Blatt, Elizabeth Denne, Philipp Reiter, Armin Schikorra

### Description

We would like to announce a two week program on Low-dimensional topology, geometry, and applications to be held at the IMA (Minnesota) in June 2019. In the first week (17 – 22 June), we will run a summer school targeted at (but not restricted to) PhD students and postdocs. There will be four courses given by

- Jun O'Hara (Chiba, harmonic analysis)
- Peter Schröder (Caltech, discrete differential geometry)
- Jennifer Schultens (UC Davis, 3-manifolds)
- Gert van der Heijden (UC London, nonlinear mechanics)

as well as a special lecture by Ken Millett (UCSB, microbiology).

In the second week (24 – 28 June) there will be a workshop providing a platform to present the most recent developments in the fields presented at the summer school.

Please register at the IMA website. Limited travel support for young participants may be available.

The organizing committee: Simon Blatt, Elizabeth Denne, Philipp Reiter, Armin Schikorra

IMA Minnesota 207 Church Street SE Minneapolis, MN 55455 United States

More information: https://www.ima.umn.edu/2018-2019/SW6.17-28.19

### CMI-HIMR Summer School in Computational Number Theory

Meeting Type: summer school

Contact: Jennifer Balakrishnan, Tim Dokchitser

### Description

### Iwasawa 2019

Meeting Type: Summer school + conference

Contact: Denis Benois, Pierre Parent

### Description

In 2019, the international Iwasawa conference takes place in Bordeaux, from June 24 to 28. It will be preceded by four mini-courses (of four hours each) on the topic.

Mini-courses (June 19 to 22):

- Euler systems (Victor Rotger, Universitat Politècnica de Catalunya)
- p-adic L-functions (Ellen Eischen, University of Oregon)
- Chern classes and Iwasawa theory (Frauke Bleher, University of Iowa)
- Computing arithmetic invariants from overconvergent modular forms (Jan Vonk, Oxford)

Conference speakers (June 24 to 28):

Daniel Barrera Salazar (Universitat Politècnica de Catalunya) Ted Chinburg (University of Pennsylvania) Mladen Dimitrov (Université de Lille) Adrian Iovita (Concordia University and Università degli studi di Padova) Joaquin Rodrigues Jacinto (University College London) Yukako Kezuka (Universität Regensburg) Guido Kings (Universität Regensburg) Antonio Lei (Université Laval) Zheng Liu (Princeton) David Loeffler(University of Warwick) Jan Nekovář (Sorbonne Université) Jishnu Ray (University of British Columbia) Giovanni Rosso (Concordia University and Cambridge) Romyar Sharifi (UCLA) Florian Sprung (Arizona State University) Eric Urban (Columbia University and CNRS) Shunsuke Yamana (Kyoto University).

Scientific committee: Denis Benois, Henri Darmon, Ming-Lun Hsieh, Masato Kurihara, Otmar Venjakob, Sarah Zerbes.

Organizers: Denis Benois, Pierre Parent.

### Copenhagen SYM 10 years anniversary

Meeting Type: conference

Contact: Jesper Grodal, Ryszard Nest, Nathalie Wahl

### Description

The center for Symmetry and Deformation is celebrating its 10 years anniversary with a conference. More info can be found on the webpage.

### Rational points on irrational varieties

Meeting Type: conference

Contact: see conference website

### Description

### Boston University-Keio University Workshop in Number Theory

Meeting Type: conference

Contact: Ali Altug, Jennifer Balakrishnan, Kenichi Bannai, Steve Rosenberg

### Description

### Derived Categories and Geometry in Positive Characteristic

Meeting Type: conference

Contact: see conference website

### Description

The scope is that of gathering scholars working in the fields of derived categories and geometry in characteristic p in order to increase interactions and collaborations.

## July 2019

### Journées Arithmétiques

Meeting Type: conference

Contact: see conference website

### Description

The Journées Arithmétiques meetings, held every two years, cover all aspects of number theory. The venues alternate between locations in France and locations elsewhere in Europe.

### Recent developments in Commutative Algebra

Meeting Type: Summer school

Contact: Aldo Conca, Srikanth B. Iyengar, Anurag K. Singh,

### Description

The Summer School will feature courses by Linquan Ma (Purdue University), Claudia Polini, (University of Notre Dame) Claudiu Raicu, (University of Notre Dame), Matteo Varbaro, (Università di Genova), Mark Walker, (University of Nebraska).

Further information will be posted on the conference website.

### Summer School on Randomness and Learning in Non-Linear Algebra

Meeting Type: conference

Contact: see conference website

### Description

### Algebraic Geometry, Number Theory and Applications in Cryptography and Robot kinematics

Meeting Type: conference

Contact: see conference website

### Description

The CIMPA School offers an intensive teaching session to graduate students and young researchers in the fields of Algebraic Geometry, Number Theory, Applications in Cryptography and Robot kinematics. This course will provide elements needed for the applications in cryptography and robot kinematics which will be developed at the end of the school. The goal of this course is for every participant to be able to select a suitable hyperelliptic curve $C$ for constructing some cryptosystems based on the discrete logarithm problem in its Jacobian $J_C$.

### European Talbot Workshop 2019: Algebraic K-theory

Meeting Type: Workshop

Contact: Bertram Arnold, Luci Bonatto, Jack Davies, Alice Hedenlund

### Description

The fifth European Talbot workshop will take place in Germany July 7 - 13, 2019. The goal is to bring together a group of 30-35 graduate students and post-docs to work on a focused topic, this year algebraic K-theory, under the guidance of two senior mentors.

Most of the talks were given by the participants, with enough free time in the afternoon and evenings for further discussions and interaction. The character of the workshop is expository in nature, starting with the basic ideas and leading to a survey of the most recent developments in the field. Since all participants are staying together at a group house, jointly responsible for cooking and cleaning, we hope to create an informal and inspiring atmosphere.

### Four-manifolds: Confluence of high and low dimensions

Meeting Type: conference

Contact: see conference website

### Description

This workshop will bring together researchers from the worlds of low- and high-dimensional manifold topology, especially those with interests in the study of 4-manifolds.

### Perfectoids

Meeting Type: summer school, conference

Contact: see conference website

### Description

An international summer school and conference on perfectoid spaces will take place July 8–12, 2019 in Rennes. The first part of the week, until the Thursday morning, will feature courses by international specialists on perfectoid rings, adic spaces and perfectoid spaces. From Thursday afternoon until the end of the conference invited speakers will present their latest results in the field. Participants and lecturers are generally expected to be present the entire week, but they also have the possibility to attend only the research conference on Thursday and Friday.

### SIAM Conference on Applied Algebraic Geometry

Meeting Type: conference

Contact: see conference website

### Description

### Rational Points 2019

Meeting Type: conference

Contact: see conference website

### Description

### Recent advances in the arithmetic of Galois representations

Meeting Type: conference

Contact: Matteo Longo, Stefano Vigni

### Description

### Women in Symplectic and Contact Geometry and Topology Workshop (WiSCon)

Meeting Type: Workshop

Contact: see conference website

### Description

Research Collaboration Conference for Women in Symplectic and Contact Geometry and Topology Workshop (WiSCon)

July 22 - 26, 2019

ICERM, Brown University

WiSCon is a Research Collaboration Conference for Women (RCCW) in the fields of contact and symplectic geometry/topology and related areas of low-dimensional topology. The goal of this workshop is to bring together women and nonbinary researchers at various career stages in these mathematical areas to collaborate in groups on projects designed and led by female leaders in the field.

Senior graduate students and early career researchers (including tenure-track) are strongly encouraged to apply!

Participants will work in teams on research projects, with researchers leading the projects including: • Penka Georgieva (Sorbonne) • Eli Grigsby (Boston College) • Tara Holm (Cornell) • Jen Hom (Georgia Tech) • Ailsa Keating (Cambridge) • Christine Ruey Shan Lee (University of South Alabama) • Chiu-Chu Melissa Liu (Columbia) • Allison Moore (UC Davis) • Emmy Murphy (Northwestern) • Yu Pan (MIT) • Ina Petkova (Dartmouth) • Ana Rita Pires (Edinburgh) • Olga Plamenevskaya (Stony Brook) • Radmila Sazdanović (North Carolina State) • Laura Starkston (UC Davis) • Lisa Traynor (Bryn Mawr) • Vera Vértesi (Strasbourg) • Katrin Wehrheim (UC Berkeley)

Applications are now open and will close on December 3, 2018.

This workshop is partially supported by NSF-HRD 1500481 - AWM ADVANCE grant.

### Young Topologists Meeting 2019

Meeting Type: conference

Contact: Stefania Ebli, Aras Ergus, Adélie Garin, Celia Hacker, Lyne Moser, Haoqing Wu

### Description

Young Topologists Meeting 2019 will be held from **Monday, July 22, to Friday, July 26, 2019** at EPFL in Lausanne, Switzerland.

The conference is intended as an opportunity for graduate students, recent PhDs, and other junior researchers in topology (both pure and applied) to meet each other and share their work. In addition to short talks by participants, the program for the meeting will include two lecture series by:

- Julie Bergner (University of Virginia)
- Vidit Nanda (University of Oxford)

Further information is going to be made available on the conference website at ytm2019.epfl.ch. The organizers can be contacted at ytm2019@epfl.ch.

### The First Journal of Number Theory Biennial Conference

Meeting Type: conference

Contact: See conference website

### Description

The Journal of Number Theory will host a number theory conference every two years to publicize recent advances in the field. The JNT is sponsoring the David Goss Prize of 10K USD to be awarded every two years at the JNT Biennial to a young researcher in number theory. Proceedings of the JNT Biennial conferences will appear in a special volume of the JNT.

### Equivariant Topology and Derived Algebra, in honour of John Greenlees’s 60th birthday

Meeting Type: conference

Contact: Scott Balchin, David Barnes, Magdalena Kedziorek, Markus Szymik, Gareth Williams

### Description

A Jolly Pleasant Conference for Greenlees (J.P.C. Greenlees) officially known as Equivariant Topology and Derived Algebra

A conference in honour of John’s 60th birthday

### Geometric methods in p-adic representation theory

Meeting Type: conference

Contact: Konstantin Ardakov, Peter Schneider

### Description

The goal of this workshop is to bring together researchers who work in number theory or representation theory or non-archimedean analysis, with an eye towards recent developments in the p-adic representation theory of p-adic groups.

Among others, the themes of the workshop include:

- applications to the p-adic local Langlands program,
- constructing representations through the cohomology of Drinfeld coverings,
- p-adic analogues of Beilinson-Bernstein localisation,
- techniques from differential-graded categories.

### WARTHOG 2019: Foundations of Tropical Geometry

Meeting Type: summer school

Contact: Ben Elias

### Description

The workshop is intended for graduate students with some postdocs, and will be led by Diane Maclagan and Jeff Giansiracusa. More information can be found on the workshop webpage.

### Young Researchers' Workshop on non-Archimedean and tropical geometry

Meeting Type: conference

Contact: Philipp Jell, Helene Sigloch, Martino Stoffel, Veronika Wanner

### Description

The follow-up to the 2015 and 2017 Students' Conferences on tropical and non-Archimedean geometry will take place in July/August 2019 in Regensburg. The target audience are PhD students and young postdocs.

Our workshop will consist of three introductory talks to tropical and non-Archimedean geometry. For the rest of the week, the participants have the opportunity to give talks about their research. We encourage everyone to apply for giving a talk by submitting an abstract.

We can offer funding, especially for PhD and Masters students. We plan on funding housing and travel expenses for all speakers plus some more participants.

## August 2019

### Floer Homotopy Theory and Low-Dimensional Topology

Meeting Type: conference

Contact: Robert Lipshitz

### Description

### ICCOPT 2019 - 6th International Conference on Continuous Optimization

Meeting Type: conference

Contact: Michael Hintermüller

### Description

ICCOPT is a flagship conference of the Mathematical Optimization Society (MOS), organized every three years. ICCOPT 2019 is hosted by the Weierstrass Institute for Applied Analysis and Stochastics (WIAS) Berlin. It will include a Summer School (August 3-4) and a Conference (August 5-8) with a series of plenary and semi-plenary talks, organized and contributed sessions, and poster sessions.

### Arithmetic and Algebraic Geometry

Meeting Type: conference

Contact: Bhargav Bhatt, Evangelia Gazaki

### Description

### Number Theory in the Americas

Meeting Type: collaboration conference

Contact: see conference website

### Description

In many Latin American countries, political instability, institutional weakness and a lack of government support for scientific research have hindered the development of mathematics. There have been signs of progress in recent years. In 2014, Brazilian mathematics received international recognition when Artur Avila became the first South American to be awarded a Fields Medal. In 2018, the International Congress of Mathematicians will be hosted in a Latin American country for the first time. Within the last five years, several major conferences, such as the Mathematical Congress of the Americas, the AGRA winter schools, and PRIMA 2017, have been organized with the specific aim of increasing mathematical activity in Latin American countries.

In spite of all of this progress, there is still room for improvement. Number theory research in South and Central America continues to be largely confined to geographically isolated pockets of activity, concentrated within a small number of subfields. Many of the strongest math students go abroad for their training, in some cases because they cannot find viable Ph.D. supervisors in the research areas that they hope to pursue in their home countries. In most areas, Latin American mathematicians continue to be poorly represented at major international conferences. The proposed workshop aims to address some of these issues. Our main objectives are as follows:

Facilitate collaboration between North, Central, and South American number theorists.

The primary aim of the proposed workshop is to promote collaboration between number theorists in North, Central, and South America. To do this, we will model our workshop after several other workshops that have been extremely successful at sparking new collaborations: the American Institute of Mathematics workshops, the AMS Mathematics Research Communities workshops, and the BIRS-sponsored Women In Numbers workshops. Participants will be divided into small project groups led by senior researchers. Most of the time during the workshop will be spent working on research in these project groups. The goal is for researchers to leave the workshop with the beginning of a research paper or, at least, with a list of good candidates for future collaborators and a deeper understanding of a timely subject.

Foster research in timely areas of number theory. All of our confirmed participants have impressive research track records, and several are leading mathematicians by world standards. All of our project groups are on areas central to current research in the field, and all of these areas can also be said to lie in the crossroads between number theory and other fields. In several cases, this requires little explanation: the study of the arithmetic of algebraic varieties lies in the intersection of number theory and algebraic geometry; the study of modular forms, which originated in complex analysis, has been essential to number theorists since Ramanujan. The Langlands program is inherently about building connections, particularly with representation theory.

Continuing with our list of topics: additive combinatorics is a relatively new name for an area that encompasses additive number theory, combinatorial arguments and probabilistic and ergodic ideas. The importance of analytical tools to number theory has been clear since Riemann, and the relevance of harmonic analysis and spectral theory has become clearer and clearer since the mid-20th century. Probabilistic arguments in number theory have been fruitful ever since Erd\H{o}s and Tur\'an. The relevance of ergodic theory and dynamical systems to number theory has been known at least since Furstenberg and Ratner. Geometry and number theory often give two different perspectives on arithmetic groups. In particular, spectral gaps and expanders are terrains where number theory, spectral theory and geometry meet.

Train young researchers. Rather than filling the workshop with invited participants, we will reserve some spaces for young researchers who can apply to work in project groups that match their interests. One of our aims is to provide specialized training for young researchers in Latin American countries and introduce them to interesting problems in areas that may not be well-represented in their home countries. In some cases, this will be their first experience with working on a collaborative project. We will take steps to create a supportive environment so that young researchers will feel encouraged by the experience. We will also hold several panel discussions on topics that will be of particular interest to young researchers (see the Overview for more details).

Provide mentoring opportunities for mathematicians who normally do not get to train young researchers. The project groups are designed to provide a vertical mentoring structure, enabling mathematicians at different stages of their careers to mentor one another. Some of our participants may be faculty members at institutions without Ph.D. programs, and some will come from countries where it is typical for the strongest students to go abroad for graduate school. Such participants will have an exceptional chance to mentor promising young researchers in their project groups.

Attract greater visibility for the work of Latin American number theorists. A growing number of Latin Americans are working in number theory. By assembling this group, we will demonstrate that there is, in fact, already a fair number of strong number theorists connected to Latin American countries. Holding our workshop at the CMO, and advertising it on the BIRS website, will lend them additional prominence.

Build a network of Spanish-speaking mathematicians. This workshop will provide the foundation for creating a global network of Spanish-speaking mathematicians. In particular, we plan to start an online community -- including a mailing-list and possibly a more visible database -- of self-identified Spanish-speaking number theorists from around the world, organized by research area, which we hope will be useful to future conference organizers. The defining criterion will be an ability and willingness to lecture and work in Spanish.

### Representation Theory and Integrable Systems

Meeting Type: conference

Contact: Evgeny Mukhin, Pavel Etingof, Giovanni Felder

### Description

A conference on the occasion of the 60th birthday of Vitaly Tarasov and the 70th birthday of Alexander Varchenko.

### Graduate Summer School on the Geometry and Modular Representation Theory of Algebraic Groups

Meeting Type: Graduate Summer School

Contact: Mark Andrea de Cataldo, Francois Greer, Christian Schnell

### Description

The goal of this summer school is to introduce Ph.D. students and Postdocs to exciting recent developments in the geometry of algebraic groups and in modular representation theory.

The school will consist of two morning lecture series and of afternoon lectures on topics directly related to the morning lecture series.

Michel Brion (Grenoble) will give one lecture series on the “Structure of algebraic groups and geometric applications”. Geordie Williamson (Sydney) will give the other lecture series “On the modular representation theory of algebraic groups.”

M. Brion’s abstract. The course will first give an overview of the “classical” structure theory of algebraic groups and of some related geometric developments and problems; for example, on automorphism groups of projective algebraic varieties. It will then address results and questions on algebraic groups over arbitrary fields, including the structure of pseudo-reductive groups (work of Conrad, Gabber and Prasad), and of pseudo-abelian varieties (Totaro). Five lectures, 75 minutes each.

G. Williamson’s abstract. This course will be about the modular (i.e. characteristic p) representation theory of reductive algebraic groups, like the general linear and symplectic groups. I will begin by reviewing the algebraic theory, where there are beautiful connections to classical Lie theory and finite group theory. I will then pass to the geometric theory (perverse and parity sheaves) which is behind recent breakthroughs in the subject. The theory is rich in mysteries and open conjectures, and I will try to outline potentially interesting research directions. Five lectures, 75 minutes each.

### Structure of Length 3 Resolutions

Meeting Type: conference

Contact: see conference website

### Description

A finite free resolution over a commutative local ring is universal for its set of ranks if every other finite free resolution with the same set of ranks can be obtained from it via base change. The existence is formal, however the question remained whether the universal ring can be taken to be noetherian. Hochster established this in 1975 in the length 2 case. Recent advances have connected this story to Kac-Moody Lie algebras and representation theory and the goal of this workshop is to introduce this research area to graduate students, with special emphasis on the length 3 case. The structure of the universal ring controls the structure of free resolutions of a given rank, and this new link allows one to explore this with the use of representation theory.

We have travel and lodging support for students and young researchers. Please use the registration form if you are interested in attending.

The plan is to have 2 introductory lectures each morning (example topics are linkage, structure theorems for finite free resolutions, basic representation theory), with problem sessions and time to write Macaulay2 code in the afternoons. Prior experience with Macaulay2 will be very helpful and participants will be able to work on computer projects with a research component.

### Women in Numbers Europe 3

Meeting Type: conference

Contact: see conference website

### Description

This is a workshop that aims to support new collaborations between female mathematicians. Before the workshop, each participant will be assigned to a working group according to her research interests. Prior to the conference, the project leaders will design projects and provide background reading and references for their groups.

Confirmed group leaders:

```
Irene Bouw (Ulm)
Rachel Newton (Reading) and Ekin Ozman (Bogazici)
Damaris Schindler (Utrecht) and Lilian Matthiessen (KTH)
Ramla Abdellatif (Picardie Jules Verne)
Cecilia Salgado (Rio de Janeiro)
Elisa Gorla (EPFL)
Eimear Byrne (Dublin) and Relinde Jurrius (Neuchâtel)
Kristin Lauter (Microsoft)
Marcela Hanzer (Zagrev)
Lejla Smajlovic (Sarajevo)
```

### Women in Topology III

Meeting Type: workshop

Contact: Julie Bergner, Angélica Osorno, Sarah Whitehouse

### Description

The purpose of the workshop is to support and expand research efforts by female mathematicians in the field of algebraic topology. The workshop will bring senior and junior researchers together with advanced graduate students to cooperate on research projects on topics of common interest. The focus of the workshop will be on active collaboration to advance the projects, rather than on knowledge communication through lectures.

## September 2019

### p-adic Langlands correspondence: a constructive and algorithmic approach

Meeting Type: conference

Contact: see conference website

### Description

The aim of arithmetic geometry is to solve equations on integers by geometric methods. One of the most prominent achievements of this approach is certainly the Langlands program, which makes a connection between representations of the absolute Galois group of $\mathbb Q$ and certain adelic representations of reductive algebraic groups. In the early 2000's, Christophe Breuil suggested the existence of a purely $p$-adic version of the Langlands correspondence and supported his vision by numerous examples. Almost twenty years after, the $p$-adic Langlands correspondence has become a major topic in number theory.

Besides, following the rapid development of computer science throughout the 20th century, a large panel of algorithmical tools has been deployed and are now quite performant, in particular for attacking questions in Number Theory. A computational approach to the (classical) Langlands correspondence has been already investigated in recent times as well. We believe that the time has come to begin to extend it to the $p$-adic Langlands correspondence.

This conference is a first step towards this perspective. It will bring together the most internationally recognized experts in $p$-adic Langlands correspondence on the one hand and effective aspects of the Langlands correspondence on the other hand. Young researchers, and more generally researchers who are familiar with one side (either the abstract one or the effective one) and are willing to learn the other side, are particularly encouraged to attend our event: a enthousiastic program with 2 mini-courses, a bunch of short lectures and an introduction to the mathematical software SageMath is specially designed for them.

### Emerton-Gee Stack and Related Topics, Hausdorff Summer School

Meeting Type: Summer School

Contact: Johannes Anschütz, Arthur-César Le Bras, Andreas Mihatsch

### Description

The goal of this school is to give a detailed and example-based introduction, accessible to PhD students and post-docs in the field, to the Emerton-Gee stack: its construction, its properties and some of its applications.

### Perfectoid spaces

Meeting Type: summer school

Contact: see conference website

### Description

In this school, we intend to understand connections between the arithmetic theory of modular forms and new developments in p-adic Hodge theory that grew from the breakthrough work of Peter Scholze on perfectoid spaces (see P. Scholze "Perfectoid spaces" Publ. Math. de l’IHES 116 (2012)).

p-adic methods play a key role in the study of arithmetic properties of modular forms. This theme takes its origins in Ramanujan congruences between the Fourier coeffcients of the unique eigenform of weight 12 and the Eisenstein series of the same weight modulo the numerator of the Bernoulli number B12. After the work of Deligne on Ramanujan's conjecture it became clear that congruences between modular forms reflect deep properties of corresponding p-adic representations. The general framework for the study of congruences between modular forms is provided by the theory of p-adic modular forms developed in fundamental papers of Serre, Katz, Hida and Coleman (1970's-1990's).

p-adic Hodge theory was developed in pioneering papers of Fontaine in 80’s as a theory classifying p-adic representations arising from algebraic varieties over local fields. It culminated with the proofs of Fontaine's de Rham, crystalline and semistable conjectures (Faltings, Fontaine-Messing, Kato, Tsuji, Niziol,...). In order to classify all p-adic representations of Galois groups of local fields, Fontaine (1990) initiated the theory of (φ, Г)-modules. This gave an alternative approach to classical constructions of the p-adic Hodge theory (Cherbonnier, Colmez, Berger). The theory of (φ, Г)-modules plays a fundamental role in Colmez's construction of the p-adic local Langlands correspondence for GL2. On the other hand, in their famous paper on L-functions and Tamagawa numbers, Bloch and Kato (1990) discovered a conjectural relation between p-adic Hodge theory and special values of L-functions. Later Kato discovered that p-adic Hodge theory is a bridge relating Beilinson-Kato Euler systems to special values of L-functions of modular forms and u sed it in his work on Iwasawa-Greenberg Main Conjecture. One expects that Kato’s result is a particular case of a very general phenomenon.

The mentioned above work of Scholze represents the main conceptual progress in p-adic Hodge theory after Fontaine and Faltings. Roughly speaking it can be seen as a wide generalization, in the geometrical context, of the relationship between p-adic representations in characteristic 0 and characteristic p provided by the theory of (φ,Г)-modules. As an application of his theory, Scholze proved the monodromy weight conjecture for toric varieties in the mixed characteristic case. On the other hand, in a series of papers, Scholze applied his theory to the study of the cohomology of Shimura varieties. In particular to the construction of mod p Galois representations predicted by the conjectures of Ash (see P. Scholze “On torsion in the cohomology of locally symmetric space" (Ann. Of Math. 182 (2015)). Another striking application of this theory is the geometrization of the local Langlands correspondence in the mixed characteristic case. Here the theory of Fontaine—Fargues plays a fundamental role.

This goal of the proposed summer school is twofold:

- Give an advanced introduction to Scholze's theory.
- To understand the relation between perfectoid spaces and some aspects of arithmetic of modular (or, more generally, automorphic) forms such as representations mod p, and lifting of modular forms, completed cohomology, local Langlands program and special values of L-functions.

We wish to bring together experts in the area of arithmetic geometry that will felicitate future research in the direction. We strongly encourage participation of young researchers.

### Algebraic Combinatorics in Genova

Meeting Type: conference

Contact: Aldo Conca

### Description

It is a pleasure to announce the meeting:

Algebraic Combinatorics in Genova

which will take place in Genova, Italy, from the 11th to the 13th of September, 2019.

Invited speakers:

Bruno Benedetti (University of Miami)

Riccardo Biagioli (Université de Lyon)

Francesco Brenti (Università di Roma Tor Vergata)

Fabrizio Caselli (Università di Bologna)

Giulia Codenotti (Freie Universität Berlin)

Alessio D'Ali (University of Warwick)

Emanuele Delucchi (Université de Fribourg)

Lukas Katthän (Goethe-Universität, Frankfurt am Main)

Christian Krattenthaler (Universität Wien)

Martina Juhnke-Kubitzke (Universität Osnabrück)

Martina Lanini (Università di Roma Tor Vergata)

Luca Moci (Università di Bologna)

Leonardo Patimo (Albert-Ludwigs-Universität Freiburg)

Volkmar Welker (Philipps-Universität Marburg)

More information can be found below and on the conference website:

https://sites.google.com/view/alg-comb-genova-2019/home

The Organising Commitee

Aldo Conca Emanuela De Negri Mario Marietti

### Wild Ramification and Irregular Singularities

Meeting Type: conference

Contact: see conference website

### Description

The planned topics include recent advances in ramification of ℓ-adic sheaves, study of irregular holonomic D-modules in higher dimensions, irregular Hodge theory, exponential motives, companions, finiteness results for local systems, etc. There are well-known analogies between wild ramification in characteristic p and irregular singularities of meromorphic differential equations, and one of our aims is to bring experts in these and related areas together.

### New Developments in Representation Theory of p-adic Groups

Meeting Type: conference

Contact: see conference website

### Description

## October 2019

### The Second Montenegrin Symposium on Graphs, Informatics and Algebra – MESIGMA 2019

Meeting Type: conference

Contact: Vladimir Bozovic

### Description

MESIGMA is a symposium that brings together researchers from several fields of mathematics and computer science.

As the scientific framework for MESIGMA is widely set, we consider it to be an incentive environment for finding the “shared territory” of diverse scientific disciplines. Therefore, MESIGMA is intended to be a little, pleasant socializing with conversations about mathematics and binding different scientific ideas.

### Modularity and Moduli Spaces

Meeting Type: conference

Contact: see conference website

### Description

**Modularity**. Until relatively recently, the celebrated Taylor--Wiles method for establishing the automorphy of Galois representations carried several significant limitations. First, the method applied only to Galois representations expected to come from cohomological automorphic forms of regular weight. For classical modular forms this excludes the case of weight 1 forms. Second, the locally symmetric space in whose cohomology the automorphic form is expected to arise was required to be an algebraic variety (a Shimura variety). This excludes for instance the case of elliptic curves over imaginary quadratic fields, where the locally symmetric space is 3-dimensional, and so cannot even admit a complex structure. Finally, in the absence of results towards Serre's conjecture on the modularity of mod p Galois representations, the Taylor--Wiles method generally only establishes the potential automorphy of Galois representations, i.e., automorphy after a finite base change.

In a major breakthrough, Calegari--Geraghty have introduced a derived version of the Taylor--Wiles method which has the potential to remove the first two of these restrictions. To realize the potential of the Calegari--Geraghty method requires overcoming a number of significant challenges in the theory of automorphic forms and the arithmetic of Shimura varieties. For instance one needs to know the existence of Galois representations attached to torsion classes in the cohomology of locally symmetric spaces, as well as strong forms of local-global compatibility for those representations. Scholze [SchTorsion] (and independently Boxer [Boxer] in some special cases) has addressed the former, and work of Cariani--Scholze [CS] on the vanishing of torsion in the cohomology of non-compact Shimura varieties has made progress towards the latter. These advances already have remarkable applications, such as the proof of potential modularity of elliptic curves over imaginary quadratic fields, as well as the Sato--Tate conjecture for such curves [tenauthor].

In addition to examining these many important developments, the workshop will contemplate possible future improvements to the Calegari--Geraghty method, such as may come from incorporating the derived deformation theory of Galatius--Venkatesh [GV]. We will also explore the prospects for proving actual (rather than potential) modularity of elliptic curves over some CM fields. Another expected topic is work in progress by Boxer--Calegari--Gee--Pilloni on the potential automorphy of abelian surfaces, using the Calegari--Geraghty method, as well as Pilloni's ``higher Hida theory'' for coherent cohomology of Shimura varieties [Pilloni].

**Moduli of Galois representations**. In ongoing work, Emerton and Gee are constructing moduli stacks which parameterize p-adic Galois representations arising from p-adic local fields. In the classical deformation theory of Galois representations, one considers formal families of deformations of a fixed mod p Galois representation; in contrast, the Emerton--Gee stacks admit non-constant families of mod p Galois representations, raising the possibility of arguing by interpolating between them. Furthermore, thanks to the global geometry of these spaces one has more algebro-geometric tools at one's disposal to study them.

The Emerton--Gee moduli stacks are built out of moduli spaces of integral p-adic Hodge theory data. Several incarnations of p-adic Hodge theory play a role in constructing and understanding these spaces, including Breuil-Kisin modules, Wach modules, and Tong Liu's (ϕ,Gˆ)-modules. Understanding how these different theories interact should a play an important role in the further development of this field. There remains many open questions about these stacks. What are the components of the special fiber? Are they normal? Cohen--Macaulay? What kind of singularities do they have? What is the structure of the line bundles/coherent sheaves on these spaces? Answers to these questions would have broad implications for modularity and the p-adic Langlands program.

The geometry of the Emerton--Gee stacks is closely linked to the Breuil--M\'ezard conjecture, which first arose in the context of attempt to generalize the Taylor--Wiles method. This conjecture measures the complexity of local Galois deformation rings (i.e., the versal deformation rings at closed points of Emerton--Gee stacks) in terms of the modular representation theory of GLn;\ understanding the geometry of local deformation spaces is essential for proving modularity lifting theorems. The Breuil--M\'ezard conjecture is in turn closely connected to the so-called weight part of Serre's conjecture, which can be viewed as a step towards the conjectural p-adic local Langlands correspondence.

For example, Caraiani--Emerton--Gee--Savitt [CEGS] are able to use known results about the geometric Breuil--M\'ezard conjecture and the weight part of Serre's conjecture for GL2 to analyze the irreducible components of certain Emerton--Gee stacks and relate them to the modular representation theory of GL2. The moduli stack perspective has also already played a role in the proof of the weight part of Serre's conjecture in generic situations in higher dimensions [LLLM1, LLLM2] and in on-going work of Emerton--Gee on the existence of crystalline lifts of mod p representations.

Despite considerable progress (e.g.\ [Herzig, GHS]), there still is no unconditional statement of the weight part of Serre's conjecture beyond the case of GL2. The Emerton-Gee moduli stack may be helpful for understanding this conjecture, as illustrated by the work of [CEGS]. One objective of the workshop will be to formulate an unconditional weight part of Serre's conjecture in terms of the Emerton-Gee stack, and to understand how such a conjecture relates to modular representation theory and to the Breuil-M\'ezard conjecture.

Finally, there are already tantalizing hints, for instance the work of [EGS] proving Breuil's local-global compatibility conjecture for types in the p-adic Langlands program, that the Emerton--Gee moduli stacks will play an important role in future developments on the modularity of Galois representations. However, this avenue is as yet largely unexplored. Another goal of this workshop is to bring together leading experts involved in these two strands of research in order to explore the possible synergies between them.

**Local models for Galois deformation spaces**. Although the two flavors of moduli spaces (Shimura varieties, Galois deformation spaces) that we have contemplated in this proposal are rather different, Kisin [Kis09a] observed that there is a surprising and fundamental relation between them:\ namely, their singularities are both modeled by relatively simpler moduli spaces called local models of Shimura varieties. These local models have been studied extensively in the context arithmetic of Shimura varieties, so that much is known about their geometry. Kisin's observation led to improved modularity lifting theorems, which in turn played a key role in the eventual proof of Serre's original conjecture for GL2/Q.

Beyond dimension two, in order to study regular weight Galois deformation spaces, there is an additional condition which comes from a subtle analogue of Griffiths transverality in p-adic Hodge theory. In [LLLM1,LLLM2], Le--Le Hung--Levin--Morra give explicit presentations for certain potentially crystalline deformation rings with Hodge--Tate weights (0,1,2) by studying this Griffiths transversality condition, and as an application prove cases of the weight part of Serre's conjecture and other related conjectures in dimension three. In higher dimension, the connection with local models is weaker and does not capture the Griffiths transversality condition. Ongoing work of Le--Le Hung--Levin--Morra constructs local models for Galois deformation spaces in generic situations and will shed light on the structure of generic parts of the Emerton-Gee moduli stack. Further, there are mysterious connections between these local models and objects in geometric representation theory which have not yet been explored.

There are a number of parallels between the mod p and p-adic stories. A striking example of this is Breuil--Hellmann--Schraen's recent proof of a Breuil--M\'ezard type conjecture for locally analytic representations, which furthermore leads to a proof of the locally analytic socle conjecture of Breuil [BHS]. They study the geometry of a p-adic family of Galois representations called the trianguline variety. In another parallel to the mod p picture, they create a link between the geometry of these p-adic families to objects in geometric representation theory.

By sharing these new developments broadly with other experts in the field, the workshop aims to spur further development of connections between moduli of Galois representations and the geometry of (generalized) local models, and of parallels between the p-adic and mod p settings; and to contemplate what the implications might be for the geometry of Emerton--Gee stacks.

## November 2019

### Analytic Number Theory

Meeting Type: conference

Contact: see conference website

### Description

## January 2020

### K-Theory, Algebraic Cycles and Motivic Homotopy Theory

Meeting Type: thematic research program

Contact: see conference website

### Description

The programme will focus on the areas of Algebraic K-theory, Algebraic Cycles and Motivic Homotopy Theory. These are fields at the heart of studying algebraic varieties from a cohomological point of view, which have applications to several other fields like Arithmetic Geometry, Hodge theory and Mathematical Physics.

It was in the 1960s that Grothendieck first observed that the various cohomology theories for algebraic varieties shared common properties, which led him to explain the underlying kinship of such cohomology theories in terms of a universal motivic cohomology theory of algebraic varieties. The theory of Algebraic Cycles, Higher Algebraic K-theory, and Motivic Homotopy Theory are modern versions of Grothendieck's legacy. In recent years it has seen some spectacular developments, on which we want to build further.

The programme will also specifically explore the connections between the following areas:

```
Algebraic K-theory, Motivic Cohomology, and Motivic Homotopy Theory;
Hodge theory, Periods, Regulators, and Arithmetic Geometry;
Mathematical Physics.
```

For this, we shall bring together mathematicians working on different aspects of this broad area for extended periods of time, promoting exchange of ideas and stimulating further progress.

During the programme there will be four workshops. At the very beginning, there will be a workshop aimed at giving a younger generation of mathematicians an overview of and introduction to this interesting, but broad area. Later there will be a workshop for each of the three areas listed above, aimed at the latest developments and applications of that area.

### Lattices: Algorithms, Complexity and Cryptography

Meeting Type: thematic program

Contact: see conference website

### Description

The study of integer lattices serves as a bridge between number theory and geometry and has for centuries received the attention of illustrious mathematicians including Lagrange, Gauss, Dirichlet, Hermite and Minkowski. In computer science, lattices made a grand appearance in 1982 with the celebrated work of Lenstra, Lenstra and Lovász, who developed the celebrated LLL algorithm to find short vectors in integer lattices. The role of lattices in cryptography has been equally, if not more, revolutionary and dramatic, playing first a destructive role as a potent tool for breaking cryptosystems, and later as a new way to realize powerful and game-changing notions such as fully homomorphic encryption. These exciting developments over the last two decades have taken us on a journey through such diverse areas as quantum computation, learning theory, Fourier analysis and algebraic number theory.

We stand today at a turning point in the study of lattices. The promise of practical lattice-based cryptosystems together with their apparent quantum-resistance is generating a tremendous amount of interest in deploying these schemes at internet scale. However, before lattice cryptography goes live, we need major advances in understanding the hardness of lattice problems that underlie the security of these cryptosystems. Significant, ground-breaking progress on these questions requires a concerted effort by researchers from many different areas: (algebraic) number theory, (quantum) algorithms, optimization, cryptography and coding theory.

The goal of the proposed special semester is to bring together experts in these areas in order to attack some of the main outstanding open questions, and to discover new connections between lattices, computer science, and mathematics. The need to thoroughly understand the computational landscape and cryptographic capabilities of lattice problems is greater now than ever, given the possibility that secure communication on the internet and secure collaboration on the cloud might soon be powered by lattices.

## March 2020

### Equivariant Stable Homotopy Theory and p-adic Hodge Theory

Meeting Type: conference

Contact: see conference website

### Description

The Banff International Research Station will host the "Equivariant Stable Homotopy Theory and p-adic Hodge Theory" workshop in Banff from March 1 to March 06, 2020.

Algebraic topology has had a long and fruitful collaboration with algebraic geometry, with each providing techniques and problems to the other. This workshop is aimed at an exciting, evolving incarnation of this story: applications of equivariant stable homotopy to number theory. Recent work on the foundations of equivariant stable homotopy theory (starting with the Hill--Hopkins--Ravenel work on the Kervaire invariant one problem) and Lurie's development of the foundations of ''derived algebraic geometry'' now allows systematic exploration and organization of ''equivariant derived algebraic geometry''. This allows us to do ordinary algebraic geometry in commutative ring spectra.

New foundations in this area have been spectacularly applied to phenomena seen in the trace methods approach to computing algebraic K -theory. For instance, although the theory of equivariant commutative ring spectra was described decades ago, few of the subtleties in the theory were understood or explored. The modern approaches to computing algebraic K-groups step through equivariant commutative ring spectra via the natural S1-action on topological Hochschild homology. Ongoing and transformative work by Bhatt--Morrow-Scholze in p-adic Hodge theory uses cyclotomic spectra and therefore subtle equivariant information. This workshop, at the vanguard of work in this area, seeks to bring together experts in algebraic topology, (derived) algebraic geometry, and number theory to explore these exciting new connections.

### Arithmetic geometry, cycles, Hodge theory, regulators, periods and heights

Meeting Type: conference

Contact: see conference website

### Description

## May 2020

### The Arithmetic of the Langlands Program

Meeting Type: conference

Contact: see conference website

### Description

### Summer School: The Arithmetic of the Langlands Program

Meeting Type: summer school

Contact: see conference website

### Description

## June 2020

### Arithmetic Geometry, Number Theory, and Computation III

Meeting Type: conference

Contact: Andrew V. Sutherland

### Description

### Advances in Mixed Characteristic Commutative Algebra and Geometric Connections

Meeting Type: conference

Contact: see conference website

### Description

The Casa Matemática Oaxaca (CMO) will host the "Advances in Mixed Characteristic Commutative Algebra and Geometric Connections" workshop in Oaxaca, from June 7 to June 12, 2020.

One of the big ideas in modern mathematics is that integers (like 1, 2, 3, 4, 5, ...) in many formal ways behave similarly to polynomial equations (like y = x^2, which defines the parabola). Frequently, and perhaps surprisingly, many questions in mathematics are easier to study for polynomials than for integers. Hence intuition and results for polynomials can tell us about the integers. Commutative algebra lives at the intersection of both perspectives, and one fundamental object of study is polynomials with integer coefficients, this is called the mixed characteristic case. Recently, Yves Andre proved a long standing open conjecture in commutative algebra in this mixed characteristic setting, relying on constructions of Scholze (and then Bhatt gave a simplified proof of the same conjecture).

This workshop aims to foster and discuss these and other recent tools, to study some remaining open problems in mixed characteristic. The workshop will bring together a diverse group of researchers from different fields, such as commutative algebra, algebraic geometry, and number theory.

### Foundations of Computational Mathematics (FoCM) 2020

Meeting Type: conference

Contact: see conference website

### Description

## July 2020

### Park City Mathematics Institute: Number theory informed by computation

Meeting Type: conference and summer school

Contact: Bjorn Poonen

### Description

### Workshop on Local Langlands and p-adic methods

Meeting Type: conference

Contact: see conference website

### Description

### Arithmetic Geometry

Meeting Type: conference

Contact: see conference website

### Description

## August 2020

### Workshop on Global Langlands, Shimura varieties, and shtukas

Meeting Type: conference

Contact: see conference website

### Description

### Decidability, definability and computability in number theory

Meeting Type: research program

Contact: see conference website

### Description

This program is focused on the two-way interaction of logical ideas and techniques, such as definability from model theory and decidability from computability theory, with fundamental problems in number theory. These include analogues of Hilbert's tenth problem, isolating properties of fields of algebraic numbers which relate to undecidability, decision problems around linear recurrence and algebraic differential equations, the relation of transcendence results and conjectures to decidability and decision problems, and some problems in anabelian geometry and field arithmetic. We are interested in this specific interface across a range of problems and so intend to build a semester which is both more topically focused and more mathematically broad than a typical MSRI program.

### Low-Dimensional Topology and Number Theory

Meeting Type: conference

Contact: see conference website

### Description

### Modern Breakthroughs in Diophantine Problems

Meeting Type: conference

Contact: see conference website

### Description

The Banff International Research Station will host the "Modern Breakthroughs in Diophantine Problems" workshop in Banff, from August 30 to September 04, 2020.

An equation is called Diophantine if whole number or fractional solutions are sought. Diophantine equations are named after Diophantus of Alexandria, a 3rd century mathematician and were popularized by Pierre de Fermat, a 17th century lawyer and amateur mathematician. Unlike most branches of mathematics, many Diophantine questions and theorems can be understood and appreciated by the general public, and the subject is a favourite with popularizers of mathematics. The methods for tackling Diophantine equations are however deep and varied, and the subject has recently experienced an explosion of new directions and results. This workshop will bring together experts and young scholars to explore these new directions and stimulate further research into Diophantine problems.

### Automorphic Forms and Arithmetic

Meeting Type: conference

Contact: see conference website

### Description

## September 2020

### Arithmetic Aspects of Algebraic Groups

Meeting Type: conference

Contact: see conference website

### Description

The Banff International Research Station will host the "Arithmetic Aspects of Algebraic Groups" workshop in Banff from September 6 to September 11, 2020.

The investigation of arithmetic groups has been an active and important area of mathematical research ever since it arose in the work of Gauss, Klein, Poincare, and other famous mathematicians of the 18th and 19th centuries. New points of view have recently led to progress on classical problems, opened new directions of inquiry, and revealed unexpected connections with other areas of mathematics. The workshop will bring together experts in the area, researchers in related fields, and young mathematicians who wish to learn about the most recent advances and the most promising directions for the future of the field.

## November 2020

### WIN5: Women in Numbers 5

Meeting Type: conference

Contact: see conference website

### Description

The Banff International Research Station will host the "WIN5: Women in Numbers 5" workshop in Banff from November 15 to November 20, 2020.

Despite recent progress in gender equality in STEM fields, women continue to be underrepresented in the research landscape of many areas of mathematics, including number theory. The Women in Numbers (WIN) network was created in 2008 for the purpose of increasing the number of active female researchers in number theory. For this purpose, WIN sponsors regular conferences, taking place approximately every three years, where female scholars gather to collaborate on cutting-edge research in the field and produce publishable scientific results. The WIN workshops provide an ongoing forum for involving each new generation of junior faculty and graduate students in state-of-the-art research in number theory. They have to come be highly regarded among the broader number theory community due to the quality of research produced by these collaborations.

WIN5 is the fifth in this series of events, bringing together female number theorists at various career stages for research collaboration and mentorship. As always, the scientific program will centre on onsite collaboration on open research problems in number theory, conducted in small groups comprised of senior and junior scholars as well as graduate students. Groups will publish their initial finding in a peer-reviewed conference proceedings volume, and research partnerships formed at the WIN5 workshop are expected to last well beyond the duration of the event. WIN projects have the potential to grow into fruitful long-term research alliances that have a transforming influence on participants' careers and a significant positive impact on the research landscape in number theory. Past WIN workshop project groups have matured into highly effective research teams producing ongoing scholarly work of exceptional scientific quality.

### Langlands Program: Number Theory and Representation Theory

Meeting Type: conference

Contact: see conference website

### Description

The Casa Matemática Oaxaca (CMO) will host the "Langlands Program: Number Theory and Representation Theory" workshop in Oaxaca, from November 29 to December 04, 2020.

Langlands functoriality conjectures predict a vast generalization of the classical reciprocity laws of Class Field Theory, providing crossroads between Number Theory and Representation Theory. The conjectures are both local and global and pertain a connected reductive group and its Langlands dual group.

We aim to introduce young mathematicians in M\'exico and Latin-America to topics of current research in the Langlands Program. We will also promote the participation women and of graduate students from a diverse background in a workshop where experts in the field from across the world will gather to expand upon the frontiers of current research. In addition to research talks, there will be three courses that will also be accessible to mathematicians working in closely related fields.