## Choose a sublist of interest

- Arithmetic Geometry
- ag.algebraic-geometry nt.number-theory
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## Or choose your own subject tags below

Welcome to MathMeetings.net! This is a list for research mathematics conferences, workshops, summer schools, etc.

There are a few other conference lists available, but this list
aims to be more complete by allowing *anyone at all* to add
announcements. Rather than use a wiki, announcement information is
stored in database format so that useful search functions can be
added as the list grows.

This site began as AlgTop-Conf, for meetings in algebraic topology. It is now expanded to serve other mathematics subjects. Use tag filtering to focus on announcements related to your discipline (see right or below).

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

#### Updates 2016-01

- Now filter announcements by subject tags
- Form for editing announcements is now the same as that for adding new announcements
- New 'view' page for each announcement, and announcement data in confirmation emails
- Select boxes improved with select2 (jquery)

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

# Upcoming Meetings

## July 2017

### Euler Systems and Special Values of L-functions

Meeting Type: semester program

Contact: see conference website

### Description

The goal of this semester-long program is to gather the leading experts in the area of Euler systems and the Birch and Swinnerton-Dyer conjecture in order to initiate a more systematic study of Euler systems on higher rank reductive groups and their applications to generalizations of the BSD conjecture (Bloch–Kato–Beilinson conjectures). At the same time, we envision several introductory courses suitable for graduate students and post-doctoral assistants.

## September 2017

### Locally Symmetric Spaces: Analytical and Topological Aspects

Meeting Type: long-term research program

Contact: see conference website

### Description

During the 2017-18 academic year, the School will have a special program on Locally Symmetric Spaces: Analytical and Topological Aspects. Akshay Venkatesh of Stanford University will be the Distinguished Visiting Professor.

The topology of locally symmetric spaces interacts richly with number theory via the theory of automorphic forms (Langlands program). Many new phenomena seem to appear in the non-Hermitian case (e.g., torsion cohomology classes, relations with mixed motives and algebraic K-theory, derived nature of deformation rings). One focus of the program will be to try to better understand some of these phenomena.

Much of our understanding of this topology comes through analysis ("Hodge theory"). Indeed harmonic analysis on locally symmetric spaces plays a foundational role in the theory of automorphic forms and is of increasing importance in analytic number theory. A great success of such harmonic analysis is the Arthur-Selberg trace formula; on the other hand, the analytic aspects of the trace formula are not fully developed, and variants such as the relative trace formula are not as well understood. Thus analysis on such spaces, interpreted broadly, will be another focus of the program.

### Instruments of Algebraic Geometry

Meeting Type: summer school, conference

Contact: see conference website

### Description

A summer school and workshop will take place in Bucharest in September 2017. Their goal is to cover some active topics in algebraic geometry: homological methods, discrete and arithmetic aspects, and singularities. Besides the mathematics, a special feature of this event will be a close relation to the George Enescu Music Festival, which takes place in Bucharest every other year. Moreover, an IMAGINARY exhibition will be presented during the three weeks of the festival, and further events involving a direct interaction of mathematics and music - and of mathematicians and musicians - are planned.

Limited financial support for participants will be available. Priority will be given to Ph.D. students and early career researchers with excellent scientific recommendations and exceptional promise. The application deadline for financial support is 1st June 2017.

Topics:

Homological methods Syzygies of a projective variety are very fine numerical invariants that control the embedding of the variety. From the syzygies, one can easily recover the Hilbert function, however, their outmost importance comes from the fact that they carry intrinsic geometric properties. They can be used to extract information on the geometry of moduli spaces of polarized varieties.

Discrete aspects They originate in the theory of toric varieties linking algebraic varieties to convex geometry and combinatorics. Nowadays, the field has expanded into several directions like tropical geometry, Berkovich-spaces, and Newton-Okounkov bodies. Algebro-geometric theories like the minimal model program have counterparts in discrete geometry.

Singularities Singularity theory is essential in the classification of algebraic varieties. While the classification in dimension one and two can be done in the smooth setting, from dimension three on the minimal model program heavily relies on singular varieties. Moreover, they play an interesting role in mirror symmetry where resolutions and deformations are interchanged.

Arithmetic geometry With Peter Scholze being one of the speakers for a series of four lectures, we shall focus on perfectoid spaces, and integral de Rham theory. With Yves André being one of the lecturers, we shall have some emphasis on motivic theory over fields, and periods. In addition, we expect some activity around the study of rational points and the index of specific varieties over p-adic fields and number fields. This should be covered by Olivier Wittenberg and other mathematicians around him.

### Second Japanese-European Symposium on Symplectic Varieties and Moduli spaces

Meeting Type: conference

Contact: see conference website

### Description

### Geometric topology in low dimensions

Meeting Type: conference

Contact: see conference website

### Description

The resolution of many of Thurston's prophetic questions about the structure of 3-manifolds has generated a vast array of techniques which permeate many of the areas covered by the symposium.

As is often the case, the resolution of old conjectures has led to intriguing new questions, which will be the focus of this workshop. Examples include: given a combinatorial or arithmetic presentation of a 3--manifold, describe its geometric structure concretely (''effective geometrisation''); understand the geometry of the Thurston unit norm ball, for example how it behaves under taking towers of covers; understand the connection between Heegard-Floer homology and orderability of fundamental groups. Several old conjectures, such as the simple loop conjecture for surfaces in three-manifolds and the conjecture that a quasifuchsian group is determined by its pleating laminations, continue to motivate work.

Links with other workshop areas include a renewed focus on computation in 3-manifold theory, the use of special cube complexes via the Agol-Wise machinery, used to resolve several of the conjectures which remained after Perelman's solution to the Geometrisation conjecture, and the geometry and combinatorics of complexes of discs and spheres in 3-manifolds, which have been used to investigate the structure of outer automorphism groups of free groups.

### Modern Moduli Theory graduate school

Meeting Type: summer school

Contact: Dominic Joyce, Kevin McGerty, Balazs Szendroi

### Description

The Graduate School will consist of lecture series and individual lectures on certain aspects of algebraic geometry and geometric representation theory. Themes within algebraic geometry will include moduli spaces of sheaves on Calabi-Yau manifolds, and more generally moduli spaces of objects in Calabi-Yau categories, especially their derived structures in shifted symplectic geometry and shifted Poisson geometry, following Calaque-Pantev-Toën-Vaquié-Vezzosi. A related set of lectures will discuss different flavours of Donaldson-Thomas invariants including the cohomological Hall algebra approach of Kontsevich-Soibelman. The geometric representation theory strand will focus on Hall algebras and higher Hall algebras, modern analogues of Beilinson-Bernstein localisation, as well as aspects of quantization.

### Workshop: Non-Positively Curved Groups and Spaces

Meeting Type: workshop

Contact: Alexander Engel

### Description

There will be 3 mini-courses (each 3 lectures 75 min. long) and around 9 invited and contributed talks. Deadline for applications for contributed talks is May 15th, 2017.

### Manifolds and Groups

Meeting Type: conference

Contact: see conference website

### Description

The aim is to bring together researchers who are interested in group theory and applications thereof to the topology and geometry of manifolds.

### Modern Moduli Theory Clay workshop

Meeting Type: conference

Contact: Dominic Joyce, Kevin McGerty, Balazs Szendroi

### Description

The workshop will focus on modern approaches to moduli problems in algebraic geometry, including derived structures on moduli spaces such as shifted symplectic and shifted Poisson structures, novel quotient constructions, and relationships to geometric representation theory.

### Period mappings: from complex to p-adic

Meeting Type: learning workshop

Contact: see conference website

### Description

This educational conference, organized on the model of the Arbeitsgemeinschaft in Oberwolfach, is devoted to the analogies between period mappings in complex and $p$-adic geometry. With Yves André’s Tohoku-Hokkaido lectures Period mappings and differential equations. From $\mathbb{C}$ to $\mathbb{C}_p$. as a roadmap, we will travel from the original sources to recent developments such as the work by Scholze and Weinstein about the moduli of $p$-divisible groups.

### Open Source Computation and Algebraic Surfaces

Meeting Type: conference

Contact: see conference website

### Description

We propose a workshop focused on designing and implementing open-source code for studying the geometry and arithmetic of surfaces. We will emphasize the development of practical skills for computer experimentation. We have two key objectives: to implement cutting-edge algorithms for counting points and computing zeta functions for surfaces, and to develop functionality for manipulating indefinite lattices.

K3 surfaces form a natural testing ground for arithmetic and geometric conjectures. These surfaces bridge a dimensional gap: they may be viewed as higher-dimensional analogues of elliptic curves, whose arithmetic finds applications in number theory and cryptography, or as lower-dimensional versions of Calabi-Yau manifolds or holomorphic symplectic varieties. Historically, arithmetic geometry has focused on understanding the properties of curves. The recent development of algorithms for, e.g., zeta-function computations, provide an opportunity to make significant advances in computational understanding of surfaces.

A robust open-source software infrastructure is of central importance for testing and reproducing mathematical experiments. Without the ability to inspect and modify code, computational exploration is opaque. SageMath offers a widely used, accessible platform for creating and sharing research mathematical software.

Objectives. Our first objective is to incorporate new algorithms for counting points and computing zeta functions of K3 surfaces in SageMath. These algorithms allow us to test conjectures in arithmetic and explore the number-theoretic implications of mirror symmetry. Historically, the theoretical and computational framework for studying zeta functions of surfaces and higher-dimensional varieties has been very limited. This situation has changed in recent years, with pioneering work including that of van Luijk in [14], Elsenhans and Jahnel in [7] and Costa and Tschinkel in [5]. Meanwhile, theoretical descriptions of the way zeta functions for projective Calabi-Yau hypersurfaces vary under one-parameter deformations have been developed (cf. [8], [12], [15]). These developments have sparked renewed interest in the arithmetic implications of mirror symmetry for K3 surfaces and Calabi-Yau varieties more generally, as seen in [1] and [9]. Making code for computing zeta functions widely available will spur the development of new methods for analyzing the arithmetic of surfaces.

In computer algebra systems, methods for working with positive definite lattices are widely available. However, functionality for indefinite lattices is essentially non-existent. The second major objective of this workshop is to bridge this gap.

Indefinite integral lattices are omnipresent in algebraic geometry. The cup product on an algebraic surface equips its middle integral cohomology group (and thus its Neron-Severi group) with the structure of an indefinite lattice. In recent years, holomorphic symplectic manifolds have become a burgeoning area of research. Via the Bogomolov-Beauville-Fujiki quadratic form, we may give their second cohomology group a lattice structure as well.

Consider, in particular, a complex K3 surface. Its second integral, singular cohomology group is a lattice of signature (3,19) which admits a weight two Hodge structure (corresponding to a complex line of the complexified lattice). The Torelli Theorem for K3 surfaces states that this datum determines the surface up to isomorphism. Over the years, many people have employed the following strategy: pick an important geometric property of a K3 surface, reformulate the property in terms of lattices and Hodge structures, and apply the powerful techniques of lattice theory to prove a theorem. This strategy has been tremendously successful in the study of automorphisms and their fixed point sets, Brauer groups, holomorphic dynamics, moduli, elliptic fibrations and their Mordell-Weil lattices, and more recently in exploration of the Umbral Moonshine phenomenon.

Recently there has been some success in combining theoretical lattice-analysis techniques with computer aided calculations. See e.g. [2, 3, 4, 6, 10, 11, 13]. In each of these projects, the authors programmed their own implementation of the calculus of indefinite lattices. Having a reliable toolbox at hand would open the field to new participants and avoid constant re-invention of the wheel. Future applications of these techniques include generalizations to the holomorphic symplectic setting, where a Torelli theorem is now available, deepening connections to Umbral Moonshine and identifying missing automorphisms, and linking to the positive-characteristic setting and exploring the phenomenon wherein Picard ranks jump in a family of surfaces.

Western Canada in general and BIRS in particular is a natural center for advances in arithmetic geometry. Our workshop extends existing networks, building on the success of the Women in Numbers and Alberta Number Theory Days series. Simultaneously, our emphasis on developing concrete computational skills provides an excellent framework for engaging junior scholars and building research connections.

## October 2017

### p-adic Cohomology and Arithmetic Applications

Meeting Type: conference

Contact: Tomoyuki Abe, Chris Lazda, Kiran Kedlaya, Ambrus Pal

### Description

These exciting new trends emerging in the field are of course deeply interwoven, as we already mentioned, and by hosting this workshop we hope to encourage new progress in these areas by promoting both predictable and unpredictable synergies between them. For example, extending the scope of p-adic cohomology will require a more sophisticated view of the foundations of the subject in order to cope with these more general situations, and will in turn feed into many of the other areas of interest, in particular representation theory and the local Langlands correspondence by providing a more powerful language in which to discuss these questions. It is important to note that p

-adic cohomology is often characterised by a plethora of different approaches to the subject, each of which has its own particular perspective and scope of application. By drawing together people working on all aspects of the theory, and building on the successful conference hosted by 2 of the organisers at Imperial College London in March 2015, we will provide a platform for a cross-fertilisation of the raft of new ideas in all these different approaches, and stimulate new developments across the whole breadth of the subject. Here we list a few topics and the expected interactions which we hope to foster via the workshop.

Foundations and theory over non-perfect fields} Traditionally, p -adic cohomology theories have been expressed for varieties over perfect ground fields of characteristic p . While much of the theory still works over non-perfect fields, arithmetic considerations (in particular the general phenomenon of semistable reduction, as well as analogies with the ℓ -adic theory) lead one to expect certain refinements of existing p -adic cohomologies (such as rigid cohomology) when working over such non-perfect fields. As a first step in this direction, the basics of this picture have been recently worked out over the simplest of non-perfect fields, namely Laurent series field in one variable, which has paved the way for a whole host of applications, such as a p -adic version of the weight monodromy conjecture and good reduction criteria for curves. This approach appears to be a rich source of new arithmetic results on varieties in characteristic p , although there is still much more foundational work to be done, both in the case of Laurent series fields and in terms of moving towards other examples such as global fields or higher dimensional local fields. On there other hand the groundbreaking work of Caro in the last decade has culminated in the proof of the existence of a 6 operations formalism in p -adic cohomology, including a full theory of weights \cite{padicwt . We expect to see interactions between these two strides of research, and the workshop will provide the perfect environment to achieve this.

The Langlands program and links with representation theory} One of the importance of the original theory of algebraic D -modules, which is over a field of characteristic zero, is that it has various application to representation theory. Beilinson--Bernstein correspondence is one of the most famous such examples. About 20 years ago Berthelot proposed a framework to establish a 6 functor formalism for schemes over fields of positive characteristics by pursuing an analogy with algebraic D -modules, and named it arithmetic D -module theory. With the above mentioned work of Caro, the foundations of the theory are essentially in place, and attention is turning to a new stage. As in the classical situation, it is hoped that the theory will prove a powerful tool for representation theory, including the p -adic Langlands program. A similar such application of D -module theory over rigid analytic spaces over p -adic fields has been already found by Ardakov--Wadsley \cite{ardwad , who used their theory to answer some representation theoretical problems which arose in the new p-adic local Langlands program.

There is a closely related work of Huyghe, Patel, Schmidt and Strauch on localisation theorems in the setting of arithmetic D -modules of Berthelot (see [HPSS}) which proves that there is an equivalence of categories between the category of locally analytic admissible representations of some split reductive group over a finite extension of Qp, and the category of coadmissible arithmetic D-modules over the rigid analytic space attached to the flag variety of the group. Similarly, the 6 operations formalism has been used by Abe \cite{abelang} to prove a p-adic Langlands correspondence in the function field setting, and thus prove Deligne's ``petits camarades cristallins" conjecture on the existence of p-adic companions to compatible systems of ℓ-adic Galois representations (at least over curves). Finally let us mention the work of Christian Johannsson, who studied the classicality for small slope overconvergent automorphic forms on certain higher dimensional Shimura varieties (see \cite{Jo]), a work whose primary innovation is to use a robust formalism of p-adic cohomology. These works all represent different aspects of the p-adic Langlands program, both over number fields and function fields, and all rely heavily on the methods of p-adic cohomology. Promoting co-operation between the experts of this subject and the leaders of the foundational theory of p

-adic cohomology will therefore be essential in progressing this exciting new direction of research.

The de Rham--Witt complex and Iwasawa theory} One of the original motivations of Grothendieck and Berthelot for inventing crystalline cohomology as a p -adic companion to the family of ℓ -adic cohomologies produced by the \'{e}tale theory was to explain p -torsion phenomenon. While integral crystalline cohomology achieves this for smooth and proper varieties, the extension to a `good' cohomology theory for arbitrary varieties, which reached its zenith in the proof of the 6 operations formalism by Caro, has been achieved only for rational coefficients, i.e. after tensoring with Q . This therefore still leaves open the question of what an integral p -adic theory should look like for open or singular varieties, which has been the subject of much recent work in the field, in particular the study of the overconvergent de Rham--Witt complex by Davis, Langer and Zink \cite{dlz . This now seems to provide a good candidate for smooth (but possibly open) varieties, although there are still many important open questions still to answer, including comparisons with other candidates such as integral Monsky--Washnitzer cohomology.

This is very closely related to the study of p -adic properties of L-functions in characteristic p where most of the work recently has been done on 1-dimensional families of abelian varieties, for example [KT}, \cite{Pa} and \cite{TV} which look at the refined Birch--Swinnerton-Dyer conjecture, the integrality of p-adic L-functions and the equivariant Tamagawa number conjecture, respectively. What is common in these works is the crucial use of integral p

-adic cohomology theories predating the construction in \cite{dlz], typically log crystalline cohomology. Therefore they are forced either to reduce the general case to the semi-stable one, or worse, restrict to the situation when the abelian scheme is semi-stable and the considered Galois covers of the base are tame. This demonstrate the limitations of these methods, but with sufficient progress on the finiteness properties of the the overconvergent de Rham--Witt complex we expect that this area would start to develop very rapidly.

Relations with function field arithmetic} We already mentioned the deep analogy and the cross-fertilisation which occurred between p -adic Hodge theory and its function field analogue at a crucial point of their development. However there are other areas of p -adic cohomology and function field arithmetic which are closely analogous and more intimate interaction would benefit both. For example a central object of study in function field arithmetic is Goss L -functions of function field motives (see for example [T1]). These motives have a cohomological theory with a trace formula (see \cite{BP1 ), but the theory does not admit 6 operations. It would greatly benefit the topic if the methods of p-adic cohomology were successfully transported into it. On there hand the transcendence theory of special values of Goss L-functions is highly developed, but uses cohomological, Tannakian and analytic methods which would be very familiar to experts of p-adic cohomology (such as Dwork's trick) if they knew them. We hope that workshop could bring the birth of a brand new transcendence theory of p-adic periods in characteristic p.

Other topics Let us mention a few more topics which were intensively studied recently and which all have deep connections to the main topic of the proposed workshop, but which we could not describe in much detail for the lack of space: p-adic differential equations, crystalline fundamental groups and p-adic Simpson correspondence, p-adic Hodge theory and p-adic representations. We just remark in passing that p-adic differential equations play a fundamental role in the foundations of the theory, the study of crystalline fundamental groups is necessary for removing some of the thorny problems encountered in the Langlands program over function fields, and some form of a p-adic Simpson correspondence might be the way to overcome these, while p-adic Hodge theory remains perhaps the single most important application of p-adic cohomology via the theory of p-adic representations. So we expect that they will remain in the focus of research, and by inviting experts in these fields we will not only spread knowledge of some of the powerful new methods available in p-adic cohomology, but also to inspire those working in the field with potential new applications of their research.

Bibliography

```
[1] abelang T.~Abe, Langlands correspondence for isocrystals and existence of crystalline companion for curves, arXiv:1310.0528, (2013).
[2] padicwt T.~Abe and D.~Caro, Theory of weights in {p
```

}-adic cohomology, arXiv:1303.0662v3, (2014).

[3] ardwad K.~Ardakov and S.~Wadsley, On irreducible representations of compact {p }-adic analytic groups, Ann. of Math., 178 (2013), 453--557.

[4] Ba1 F. Baldassarri, Continuity of the radius of convergence of differential equations on p -adic analytic curves, Invent. Math. 182 (2010), 513--584.

[5] cohcrist P.~Berthelot, Cohomologie cristalline des sch{\'e}mas de characteristic {p>0 }, Lecture Notes in Mathematics 407, Springer-Verlag, Berlin-New York, 1974.

[6] B1 P.~Berthelot, Finitude et puret\'e cohomologique en cohomologie rigide, Invent. Math. 128 (1997), 329--377.

[7]{Bess1} A.~Besser, A generalization of Coleman's p -adic integration theory, Invent. Math. 142 (2000), 397--434. \bibitem[8] Bess2 A.~Besser, Coleman integration using the Tannakian formalism, Math. Ann. 322 (2002), 19--48.

[9] BP1 G.~B\"ockle and R.~Pink, Cohomological theory of crystals over function fields, Tracts in Mathematics 5, European Mathematical Society, (2009).

[10] dlz C.~Davis, A.~Langer, and T.~Zink, Overconvergent de {R}ham-{W}itt cohomology, Ann. Sci. \'Ec. Norm. Sup\'er. 44 (2011), 197--262.

[11] DW B.~Dwork, On the rationality of the zeta function of an algebraic variety, Amer. J. Math. 82 (1960), 631--648.

[12] G1 M.~Gros, R\'egulateurs syntomiques et valeurs de fonctions L p -adiques I, with an appendix by Masato Kurihara, Invent. Math. 99 (1990), 293--320.

[13] G2 M.~Gros, R\'egulateurs syntomiques et valeurs de fonctions L p -adiques II, Invent. Math. 115 (1994), 61--79.

[14] grothcrys A.~Grothendieck, Crystals and the de {R}ham cohomology of schemes}, in {\it Dix {e}xpos\'es sur la {c}ohomologie des {s}ch\'emas, North-Holland, Amsterdam--Paris, 1968, pp. 306--358.

[15] Ha U.~Hartl, Period spaces for Hodge structures in equal characteristic, Ann. of Math. 173 (2011), 1241--1358.

[16] HPSS C.~Huyghe, D.~Patel, T.~Schmidt, and M.~Strauch, D† -affinity of formal models of flag varieties, arXiv:1501.05837, (2015).

[17] hyodokato O.~Hyodo and K.~Kato, Semi-stable reduction and crystalline cohomology with logarithmic poles, Ast\'erisque 223, 1994, pp. 221--268.

[18] Jo C.~Johannsson, Classicality for small slope overconvergent automorphic forms on some compact PEL Shimura varieties of type C, Math. Ann. 357 (2013), 51--88.

[19] KT K.~Kato and F.~Trihan, On the conjectures of Birch and Swinnerton-Dyer in characteristic p>0, Invent. Math. 153 (2003), 537--592.

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[21] Ke1 K.~Kedlaya, Convergence polygons for connections on nonarchimedean curves, arXiv:1505.01890v2, to appear in the proceedings of the Simons Symposium on non-archimedean and tropical geometry, (2015).

[22] KL K.~Kedlaya and R.~Liu, Relative p-adic Hodge theory: foundations, Ast\'erisque, to appear, 210 pages.

[23] kim1 M.~Kim, The unipotent Albanese map and Selmer varieties for curves, Publ. RIMS, Kyoto Univ. 45 (2009), 89--133.

[24] lauderzeta A.~Lauder, A recursive method for computing zeta functions of varieties, LMS J. Comput. Math. 9 (2006), 222--269.

[25] LP C.~Lazda and A.~P\'al, Rigid cohomology over Laurent series fields, Algebra and Applications, Springer--Verlag, London, to appear, 191 pages.

[26] messing W.~Messing, The crystals associated to {B}arsotti-{T}ate groups: with applications to abelian schemes, Lecture Notes in Mathematics 264, Springer-Verlag, Berlin-New York, 1972.

[27] MW P.~Monsky and G.~Washnitzer, Formal cohomology. I, Ann. of Math. 88 (1968), 181--217.

[28] Mo M.~Morrow, A Variational Tate conjecture in crystalline cohomology, preprint, (2015).

[29] Pa A.~P\'al, The Manin constant of elliptic curves over function fields, Algebra Number Theory 4 (2010), 509--545.

[30] PP J. Poineau and A. Pulita, The convergence Newton polygon of a p-adic differential equation IV: local and global index theorems, arXiv:1309.3940v1 (2013).

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### Workshop on motivic and equivariant homotopy theory

Meeting Type: workshop

Contact: Martin Frankland, Manh Toan Nguyen, Konrad Voelkel

### Description

See the website.

### Degeneration of Calabi-Yau varieties and arithmetic

Meeting Type: summer school

Contact: Fritz Hörmann, Emanuel Scheidegger

### Description

The speakers: - Charles Doran (University of Alberta) - Matt Kerr (Washington University) - Radu Laza (Stony Brook University) - Johannes Walcher (University of Heidelberg) - Don Zagier (MPIM Bonn)

The topic: Hodge-theoretic and arithmetic aspects of families of Calabi-Yau varieties (mainly in dimensions 2 and 3), in particular differential equations for periods, degenerations at the boundary, compactifications of moduli spaces, and relations to modular and more general automorphic forms, as well as to physics.

The school is intended for both mathematicians and string theorists with interest in mathematical aspects of Calabi-Yau manifolds.

### Topics in arithmetic and algebraic geometry

Meeting Type: autumn school

Contact: Dino Festi, Ariyan Javanpeykar, Davide Cesare Veniani

### Description

This is an Autumn School of the SFB/TRR 45 Bonn-Essen-Mainz financed by the DFG (Deutsche Forschungsgemeinschaft).

This school is intended for advanced master students, PhD students, and young researchers in algebra, number theory and geometry.

### Lie Theory, Geometry, and Differential Equations

Meeting Type: Fall School

Contact: Ilka Agricola (on behalf of all organizers)

### Description

This joint Fall School of the Math Departments of Marburg and Gießen takes places at Castle Rauischholzhausen near Marburg, a university owned conference center known for its casual atmosphere.

We invite students and young scientists working in Lie theory and adjacent areas from analysis, algebraic geometry, and differential geometry to participate!

There will be four series of lectures:

Hansjörg Geiges (Köln) -- Contact geometry and dynamics

Nicolas Perrin (Versailles, France) -- Varieties with a group action

Mihaela Pilca (Regensburg) -- Locally conformally Kähler geometry

Anke Pohl (Jena) -- Eigenfunctions on locally symmetric spaces

Furthermore, there will a selection of talks by participants and a poster session. All talks of the Fall School will be in English.

### AGNES

Meeting Type: conference

Contact: see conference website

### Description

### Maine-Québec Number Theory Conference

Meeting Type: conference

Contact: see conference website

### Description

### Western Algebraic Geometry Symposium

Meeting Type: conference

Contact: see conference website

### Description

WAGS is a twice-yearly meeting of algebraic geometers in the western half of the United States and Canada that traces its origins back to the Utah-UCLA Algebraic Geometry Seminar started in 1989.

### Oregon Number Theory Days

Meeting Type: conference

Contact: Shabnam Akhtari

### Description

### Constructing cryptographic multilinear maps

Meeting Type: workshop

Contact: see conference website

### Description

This workshop, sponsored by AIM, the Alfred P. Sloan Foundation, and the NSF, will be devoted to the problem of constructing secure and efficient cryptographic multilinear maps. Cryptographic multilinear maps are a powerful tool in cryptography. They solve many long-standing open problems in cryptography and computer security that currently cannot be solved any other way. Unfortunately, all known constructions are extremely inefficient and have been shown to be insecure for some applications. The aim of this workshop is to make full use of advanced mathematical ideas, including those coming from algebraic geometry, number theory, or topology, in order to make progress on this problem and show the way towards satisfactory solutions. The plan is for the working groups to have a mixture of expertise from mathematics and computer science, and also from the cryptographic and cryptanalytic sides, to make sure that proposed solutions survive the tests of being both efficient and secure.

### Workshop on "General Relativity and AdS/CFT"

Meeting Type: Workshop

Contact: Spiro Karigiannis

### Description

This workshop will run over two weeks, Monday to Friday each week.

See website for more details and for registration.

### Topology and Geometry of Low-dimensional Manifolds

Meeting Type: conference

Contact: see conference website

### Description

**Invited Speakers**

- Tsukasa Ishibashi (The University of Tokyo)
- Yusuke Kuno (Tsuda University)
- Christine Lescop (Université Grenoble Alpes, Institut Fourier, CNRS)
- Shigeyuki Morita (The University of Tokyo/Tokyo Institute of Technology)
- Takahiro Oba (Tokyo Institute of Technology)
- Athanase Papadopoulos (IRMA, Université de Strasbourg, CNRS)
- Shunsuke Tsuji (The University of Tokyo)
- Akira Yasuhara (Tsuda University)

### No Boundaries: A celebration of the mathematical contributions of Benson Farb

Meeting Type: conference

Contact: see conference website

### Description

### Automorphic Forms, Mock Modular Forms and String Theory

Meeting Type: conference

Contact: see conference website

### Description

The main objective of this workshop is to gather physicists and mathematicians working on automorphic forms, mock modular forms, black holes and moonshine in an effort to foster cross-fertilisations between these different fields. Over the last few years there have been numerous conferences devoted to the connection between mock modular forms, moonshine and string the- ory, but at these meetings the community of mathematicians working on automorphic forms and automorphic representations is usually absent. It is also our impression that mathematicians working on the Langlands program are usually unaware that many similar structures occur naturally in string theory. Thus, this proposed meeting will be dedicated to stimulating the exchange of ideas and perspectives coming from these seemingly disparate fields. This will focus parallel research activities in different fields and the BIRS workshop format and the BIRS facilities provide an ideal environment for this endeavor.

Specifically, the workshop will focus on the following cross-disciplinary areas:

• The connection between string theory amplitudes and small automorphic representations. The most supersymmetric string theory scattering processes have been interpreted as very small auto- morphic representations. Less supersymmetric processes call for an in-depth study of increasingly larger automorphic representation.

• Representation theoretic aspects of mock modular forms. Classical modular forms have a natural interpretation in terms of representation theory of reductive groups. What about mock modular forms?

• Automorphic forms on Kac-Moody groups and their relation with string amplitudes in low dimensions. The theory of automorphic forms on Kac-Moody groups and especially their Fourier ex- pansion needs to be developed further for understanding low-dimensional string theory amplitudes.

• Mock modular forms and Siegel modular forms in umbral moonshine. Umbral moonshine gives rise to a rich family of Jacobi forms and mock modular forms. Jacobi forms can be lifted to Siegel modular forms. What is the corresponding lift of the associated mock modular forms?

• Connections between umbral moonshine and Calabi-Yau compactifications of string theory. A proper string theory understand- ing of Mathieu or umbral moonshine in terms of a an underlying con- formal field theory is currently lacking.

• Automorphic representations and black hole counting. Understanding the microscopic origin of the entropy of a black hole requires counting black hole states in string theory. Since the same states also contribute to the Fourier expansion of automorphic forms, the counting problem could be rephrased in automorphic terms.

### Interplay between Number Theory and Analysis for Dirichlet Series

Meeting Type: invitational conference

Contact: see conference website

### Description

```
Organisers
```

Frédéric Bayart, Aubière

Kaisa Matomäki, Turku

Eero Saksman, Helsinki

Kristian Seip, Trondheim

### International Autumn School on Computational Number Theory

Meeting Type: Autumn School

Contact: Engin Buyukasik, Ilker Inam, Gabor Wiese

### Description

Aims: Introduce Master and PhD students to computational number theory. Teach some topics in modern number theory related to current research. Introduce the practical use of computer algebra systems for studying research questions in number theory.

Areas: Modular forms, Diophantine equations, Galois representations, etc.

### Analytic and Algebraic Methods in Differential Equations 2017

Meeting Type: conference

Contact: see conference website

### Description

The conference "Analytic and Algebraic Methods in Differential Equations 2017" (AAMDE 2017) is organized by the Kharkevich Institute for Information Transmission Problems (IITP RAS) within the framework of a joint RFBR-CNRS project. It will take place in Moscow, Russia, from October 31 to November 2, 2017. Sessions will be held at IITP RAS (Bolshoy Karetny per. 19, build.1, see the map ).

We hope that the meeting will be an opportunity for an international collaboration in such directions of Analytic Theory of Differential Equations as Direct and Inverse Monodromy Problems, Differential Galois Theory, Asymptotic and Summability Theory, Isomonodromic Deformations, Painlevé Equations and more.

We dedicate this conference to the memory of our teachers and colleagues, Andrey Bolibrukh and Dmitry Anosov.

Speakers

Moulay Barkatou (University of Limoges, France) Thomas Cluzeau (University of Limoges, France) Vladimir Dragovic (University of Texas at Dallas, Richardson, USA) Alexey Glutsyuk (ENS, Lyon, France and HSE, Moscow, Russia) Valery Gromak* (Belarusian State University, Minsk, Republic of Belarus) Davide Guzzetti (SISSA, Trieste, Italy) Anton Izosimov* (Max Planck Institute for Mathematics, Bonn, Germany) Ilya Kossovskiy (Masaryk University Brno, Czech Republic) Alberto Lastra (University of Alcalá, Spain) Stéphane Malek (University of Lille, France) Slawomir Michalik (Cardinal Stefan Wyszynski University, Warsaw, Poland) Andrey Mironov (Sobolev Institute, Novosibirsk, Russia) Vladimir Poberezhnyi* (HSE, Moscow, Russia) Javier Sanz (University of Valladolid, Spain) Vasilisa Shramchenko (University of Sherbrooke, Canada) Loïc Teyssier (University of Strasbourg, France) Jacques-Arthur Weil (University of Limoges, France) Changgui Zhang (University of Lille, France)

- to be confirmed

Program Committee

Alexey Glutsyuk (ENS de Lyon and HSE, Moscow) Reinhard Schäfke (University of Strasbourg, France)

Organizing Committee

Renat Gontsov (IITP RAS, Moscow) Irina Goryuchkina (Keldysh Institute of Applied Mathematics RAS, Moscow) Anastasia Parusnikova (HSE, Moscow) Ilya Vyugin (IITP RAS and HSE, Moscow)

Anyone interested in the conference is encouraged to register filling out the registration form before September 10.

Please do not hesitate to contact us at aamde2017@iitp.ru for any questions or advice.

## November 2017

### Minischool on "Mean Curvature Flow and Ricci Flow"

Meeting Type: Minischool

Contact: Spiro Karigiannis

### Description

This two-day minischool will serve to prepare graduate students, postdoctoral fellows, and other researchers less familiar with geometric flows for the five-day workshop on Mean Curvature Flow and Ricci Flow, immediately following, on Nov 6-10. Speakers and tentative titles:

Registration information will appear soon on the minischool website.

### Special Session in Homotopy Theory

Meeting Type: Special Session

Contact: Jonathan Beardsley

### Description

Special session in homotopy theory at the AMS Western Sectional Meeting.

### Motives, Galois Representations and Cohomology Around the Langlands Program

Meeting Type: conference

Contact: see conference website

### Description

### Workshop on "Mean Curvature Flow and Ricci Flow"

Meeting Type: Workshop

Contact: Spiro Karigiannis

### Description

See website for more details and for registration.

### Lloyd Roeling Topology Conference

Meeting Type: conference

Contact: Scott Bailey, Daniel Davis, Robin Koytcheff, Peter Oman

### Description

Lloyd Roeling Topology Conference

November 10-12, 2017

University of Louisiana at Lafayette (UL)

The annual University of Louisiana at Lafayette Lloyd Roeling Conference, whose focus this year is topology (including both geometric topology and homotopy theory), will have the following invited speakers*:

Ettore Aldrovandi (Florida State)

Shaun Ault (Valdosta State)

Scott Bailey (Clayton State)

Jeremy Brazas (West Chester University)

Saul Glasman (Minnesota)

Shelly Harvey (Rice) - to be confirmed

Jennifer Hom (Georgia Tech)

Rafal Komendarczyk (Tulane)

Samuel Lisi (Mississippi)

Duane Randall (Loyola University New Orleans)

Mentor Stafa (Tulane)

Nathaniel Stapleton (Kentucky/Regensburg)

David Shea Vela-Vick (LSU)

* there will be a slight-but-negligible variance in talk lengths

Also, the departmental Colloquium on Nov. 9th will be given by

Saul Glasman (Minnesota).

Additionally, the conference will have 7 student talks that are 15- or 20-minutes long for advanced undergraduates and Master's-level students advancing to a Ph.D. to be done not at their current institution. There will be 3 prizes of $125, $100, and $75 for these talks. Further planning for them is underway, with priority given to students at speakers' institutions.

The conference will start on Friday (the 10th) around 1 p.m. and end on Sunday around noon/12:15 p.m.

Information about the conference, as it becomes available, will be posted at

https://math.louisiana.edu/node/181.

Some more information about the conference and UL follows.

In the Carnegie classification, UL is designated as having "Higher Research Activity" and, in the NSF's 2015 HERD rankings for the mathematical sciences, UL's math department was 80th.

The conference budget is modest: our annual tradition since 1970 is that, while there isn't funding for the travel and lodging expenses of speakers and participants, there will be nice (perhaps "classical and contemporary") Cajun-style dinners on Friday and Saturday nights (respectively) provided for by the Lloyd Roeling Conference Fund and the Math Dept.

Best regards,

Daniel, on behalf of the Organizing Committee:

Scott Bailey (Clayton State), Daniel Davis (UL),

Robin Koytcheff (UL), and Peter Oman (Southeast Missouri State)

### Midwest Topology Seminar

Meeting Type: conference

Contact: Dan Isaksen

### Description

The Fall 2017 meeting of the Midwest Topology Seminar will be held at Wayne State University in Detroit, Michigan on Saturday 11 November. See the conference website for more details.

### Arithmetic and Complex Dynamics

Meeting Type: conference

Contact: see conference website

### Description

This workshop will bring together leading researchers from complex dynamics, non-Archimedean analysis and geometry, and algebraic and arithmetic geometry, with the goal of making progress on current problems in arithmetic dynamics. Recent breakthroughs have come from groups of mathematicians whose backgrounds span these varied disciplines. We will focus on sharing ideas and tools among researchers from diverse specialties in hopes of inspiring new questions and collaborations in arithmetic dynamics.

Arithmetic dynamics is an exciting and relatively new field, with many significant recent developments, so we plan to include a considerable number of young researchers. Our intended list of participants also includes a number of experts in complex dynamics and arithmetic geometry, since much of arithmetic dynamics concerns the connections between these two fields. For instance, the recent work on unlikely intersections in complex dynamics originated with a collaboration between non-Archimedean analyst Baker and complex dynamicist DeMarco, inspired by questions of arithmetic geometers Poonen, Masser, and Zannier. The workshop will sustain these extant collaborations, and found new cross-discipline research groups. To encourage this, the workshop will include casual open problem sessions on selected evenings during the week, and a speaker schedule that allows for interaction and discussion between talks.

We believe that the diverse group of researchers at the workshop will inspire many new questions in arithmetic dynamics and related fields; however, the workshop will focus on three main areas of research to guide the talks and open problem sessions.

Objective 1 (Unlikely intersections).} Bring participants up to date on recent progress in unlikely intersections in complex dynamics and in Diophantine geometry, and discuss the technical obstacles which must be overcome for future research, for example, towards developing a clean, well-formulated dynamical Andr\'e-Oort conjecture. Also of primary interest will be possibilities towards proving higher-dimensional versions of this conjecture, since all proved cases to date concern 1-dimensional varieties. Current results in this direction include progress on the dynamical analogs of well-known conjectures in arithmetic geometry, such as Mordell-Lang, Manin-Mumford, and Andr\'e-Oort [BD, BGT,Xie:DML, DF, GTZ, DWY, GKN, GKNY, GHT}. The dynamical proofs use a rich collection of techniques which include the deep equidistribution theorems of~\cite{BR, CL, FRL, YZ, Zhang:ICM], classical techniques of complex analysis and potential theory, and Ritt's theory of decomposition of polynomials, and are all illustrative of the general principle of unlikely intersections in arithmetic geometry, as in \cite{Andre, BMZ, O.

Objective 2 (non-Archimedean geometry/analysis).} Discuss the status of equidistribution theorems in various contexts, building on work of \cite{FRL, BR, CL, YZ, and the earlier ideas of Szpiro-Ullmo-Zhang, used to study abelian varieties. We now that we understand that weaker hypotheses are needed for various applications, and also that equidstribution does not always hold, even for "nice" height functions. As examples, there is the recent (non-dynamical) work of Rivera-Letelier, Burgos Gil, Philippon, and Sombra, studying the equidistribution on toric varieties, and the dynamical example of DeMarco, Wang and Ye showing that a desired ``adelic metrized line bundle" in the sense of Zhang is not always adelic. The existing equidistribution theorems have been used in many dynamical applications recently.

Objective 3 (Heights in arithmetic dynamics).} The concept of height plays a key role in arithmetic geometry, for example in Falting's proof of the Mordell conjecture and the proof of the Bogomolov conjecture by Szpiro-Ullmo-Zhang. In arithmetic dynamics, they are everywhere. Given a rational self-map of a projective variety defined over a number field, Silverman has formulated several conjectures that relate the asymptotic growth of the height along the orbit to quantities such as the dynamical degrees of the map. Special cases of these conjectures were recently proved in~\cite{Silverman:canheights, KS13,KS14,JW,JR. The workshop will feature new developments in this area, as well as related topics such as heights for finitely generated extensions of the rational numbers as studied by Moriwaki or Yuan-Zhang.

### ECC 2017: 21st Workshop on Elliptic Curve Cryptography

Meeting Type: conference

Contact: see conference website

### Description

ECC is the annual workshop dedicated to the study of elliptic-curve cryptography and related areas of modern cryptography, for more information, also about past editions of ECC, please see the main ECC website. The 21st Workshop on Elliptic Curve Cryptography (ECC 2017) will take took place on November 13–15, 2017, in Nijmegen, The Netherlands. The workshop is accompanied by a 3-day "summer" school on elliptic curves aimed at getting graduate students involved in the area. The "summer" school will take take place on November 9–11, 2017. The aim of ECC is to bring together leading experts from academia, industry, and government, as well as young researchers and graduate students for the purpose of exchanging ideas and presenting their work. The ECC Workshops has invited presentations only. Presentations tend to give an overview on emerging or established areas of modern cryptography, often combined with new research findings and often lead to new collaborations between attendees.

### Algebraic Geometry with "Fancy" Coefficients

Meeting Type: Conference

Contact: Daniele Turchetti, Jérôme Poineau

### Description

The aim of the conference is to bring together young researchers and experts of recent developments of arithmetic geometry. Topics include geometry over finite fields, Diophantine geometry, nonarchimedean phenomena and covers of curves.

Some of the talks will have a special format, with a 45 minutes introduction aiming to introduce young mathematicians to the tools that will be used in the main part of the talk. This will allow all participants to engage with topics that are not directly related to their research.

### Rational points and Zariski density

Meeting Type: conference

Contact: see conference website

### Description

The aim of the meeting is to gather experts studying various questions concerning rational points on algebraic varieties. The program will cover a large spectrum, from diophantine geometry and algebraic geometry to analytic number theory.

### Winter school: Categorification, representation theory and symplectic geometry

Meeting Type: Winter school

Contact: Anne-Laure Thiel, Daniel Tubbenhauer

### Description

There is a fruitful interplay between categorification, representation theory and symplectic geometry, and our intention is to highlight some of them in detail.

We hope to bring together researchers as well as students who want to learn more about the various presented aspects of the broad fields categorification, representation theory and symplectic geometry.

Please make sure that you register due to seats constraints. (Application deadline is the 31th of July 2017.)

### Workshop: Categorification, representation theory and symplectic geometry

Meeting Type: Workshop

Contact: Anne-Laure Thiel, Daniel Tubbenhauer

### Description

There is a fruitful interplay between categorification, representation theory and symplectic geometry, and our intention is to highlight some of them in detail.

We hope to bring together researchers as well as students who want to learn more about the various presented aspects of the broad fields categorification, representation theory and symplectic geometry.

Please make sure that you register due to seats constraints. (Application deadline is the 31th of July 2017.)

## December 2017

### Palmetto Number Theory Series XXIX

Meeting Type: conference

Contact: Jim Brown

### Description

The Palmetto Number Theory Series (PANTS) is a series of number theory meetings held at colleges and universities in South Carolina, the Palmetto State as well as neighboring states. The core members of the PANTS consortium are:

- Clemson University
- University of South Carolina

The goal of the PANTS meetings is to provide an opportunity for number theorists in South Carolina, and more generally, in the Southeast, to hear about recent research in all areas of number theory, pure and applied.

### D-modules, Geometric Representation Theory, and Arithmetic Applications

Meeting Type: conference

Contact: see conference website

### Description

While D-modules have played a major role in the representation theory of real reductive groups for a long time, the use of appropriate differential operators on p-adic spaces to study representations of p-adic reductive groups is a more recent development.

This workshop will bring together experts working in the fields of D-modules and the representation theory of real and p-adic reductive groups to review the progress that has been made in the p-adic setting over the last four to five years.

### New Advances in Fano Manifolds

Meeting Type: school

Contact: Lawrence Barrott, Diletta Martinelli, Roberto Svaldi, Jakub Witaszek

### Description

We are happy to advertise the school

"New advances in Fano manifolds",

which will take place at the University of Cambridge, 4th - 8th December 2017.

It will consist of two mini-courses:

-"Linear systems on Fano varieties" by Prof Caucher Birkar, and

-"Fano foliations" by Dr Carolina Araujo.

The workshop is aimed at PhD students, post-docs, and young researchers.

We will have funding to cover accommodation for postgraduate students studying in the UK. There may be some extra funding available for graduate students from other institutions.

For more information (including registration, funding, and other details), please visit the website http://dpmms.cam.ac.uk/~rs872/conf/school17/.

Please register using the following form, https://goo.gl/forms/a0GiqIL66rOcmN3t2. If you wish to be considered for financial support you should complete the registration by September 29th.

With best wishes,

Lawrence Barrott, Diletta Martinelli, Roberto Svaldi, Jakub Witaszek.

### School and Workshop on Univalent Mathematics

Meeting Type: workshop/winter school

Contact: Benedikt Ahrens, Chris Kapulkin

### Description

### Transformation groups 2017

Meeting Type: conference

Contact: Michael Finkelberg, Ivan Loseu, Leonid Rybnikov, Evgeny Smirnov, Vladimir Zhgoon

### Description

The conference «Transformation Groups 2017» is aimed to review recent developments in Transformation Group Theory, to present the most bright recent achievements in this area, and to discuss the perspectives of further research. The conference will be dedicated to the anniversary of Ernest Vinberg, who will become eighty in the Summer of 2017. Professor Vinberg has been (and still is) a major expert and active researcher in Lie groups and algebras, discrete and continuous transformation groups, algebraic groups and invariant theory. He has invented numerous methods, proposed many conjectures, solved a number of difficult and deep problems (both alone and with his collaborators) and served as a Ph.D. advisor of many notable researchers in the several areas related to Transformation groups.

The conference is not intended to focus on a narrow set of problems, but rather to present a broad look at recent progress in the field, highlighting new techniques and ideas. Main topics of the conference are:

- Algebraic groups and Geometric Invariant theory;
- Transformation groups in Differential geometry and Analysis;
- Structure and representation theory of Lie algebras and their generalizations;
- Discrete subgroups of Lie groups and discrete transformation groups.

### Algebraic Geometry and Number Theory

Meeting Type: conference

Contact: see conference website

### Description

This conference will be on various topics in algebraic geometry, number theory and interplay between them.

### Contemporary mathematics 2017

Meeting Type: conference

Contact: S. Lando

### Description

National Research University Higher School of Economics Moscow Mathematical Society Skolkovo Institute of Science and Technology Steklov Mathematical Institute RAS Kharkevich Institute of Information Transmission Problems Independent University of Moscow

organize the Conference Contemporary mathematics in honor of the 80th birthday of Vladimir Arnold (1937-2010). The Conference will take place in December 18-23, 2017 in Moscow, Russia. The Conference will cover such subjects as Singularity theory, Topology, Differential equations and Dynamical systems, Mathematical Physics, Representation theory, and Algebraic geometry, which fall into the domain of interest of Vladimir Arnold. Financial support for invited speakers and young participants is expected.

## January 2018

### Periods in Number Theory, Algebraic Geometry and Physics

Meeting Type: conference

Contact: see conference website

### Description

he word "period" is used to designate any number represented by the integral of an algebraic differential form over a cycle in an algebraic variety over \mathbb{Q} (or \overline{\mathbb{Q}}). These include many numbers of interest in number theory and mathematical physics (multiple zeta values, Mahler measures, superstring amplitudes, ...), and also have deep connections with special values of motivic L-functions.

The trimester will be divided into five "activities", each concentrating on one topic and including one or several introductory courses, and also three one-week workshops featuring lectures on current work:

```
Motives and Periods (Jan 3 - Jan 14)
Workshop: Periods and Regulators (Jan 15 - Jan 19)
Regulators (Jan 20 - Feb 4)
Amplitudes (Feb 5 - Feb 25)
Workshop: Amplitudes and Periods (Feb 26 - Mar 2)
Picard-Fuchs Equations and Geometry (Mar 3 - Mar 25)
Workshop: Picard-Fuchs Equations and Hypergeometric Motives (Mar 26 - Mar 30)
Hypergeometric Motives (Mar 31 - Apr 20)
```

### Singularities and Algebraic Geometry

Meeting Type: conference

Contact: Nero Budur (KU Leuven), Le Quy Thuong (VNU), Nguyen Hong Duc (BCAM), Pho Duc Tai (VNU)

### Description

The conference is dedicated to recent advances in Algebraic Geometry and Singularities.

### Explicit Number Theory

Meeting Type: CIMPA research school

Contact: Valerio Talamanca

### Description

The aim of this research school is to introduce young researchers to the explicit side of Number Theory.

As it has becoming clear in the past decades many number theoretic constructions can find an application

in cryptography or coding theory, but to do so they have to be in explicit form. This school will provide

interested students from South Africa and neighbouring countries with the opportunity to get an introduction

to the computational as well as theoretical side of several number theoretical topics such as:

- explicit computations in number fields (such as finding their class groups, unit groups, etc.);
- explicit solutions of Diophantine equations (such as Pell equations, Thue equations, etc.);
- efficient algorithms for prime testing and factorization of integers;
- explicit construction of elliptic curves over finite fields with prescribed number of points.

### Model theory, combinatorics and valued fields

Meeting Type: thematic program

Contact: see conference website

### Description

Model theory is a branch of mathematical logic which deals with the relationship between formal logical languages (e.g. first order logic, or variants such as continuous logic) and mathematical objects (e.g. groups, or Banach spaces). It analyses mathematical structures through the properties of the category of its definable sets. Significant early applications of model theory include Tarski's decidability results in the 1920s (algebraically closed fields, real closed fields), and in the 1960s the well-known Ax-Kochen/Ershov results on the model theory of Henselian valued fields.

These last few years have seen an extremely rapid development of the powerful tools introduced for stable structures in a much larger context, that of “tame” structures. Our main themes for this programme aim to develop both the internal model theory of tame structures and their recent applications.

The programme will bring together researchers on the following topics:

(i) Model theory and application to combinatorics. Additive combinatorics (approximate subgroups and variations); Around Szemerédi Regularity Lemma and Density Theorem; Pseudofinite structures (e.g., ultraproducts of finite structures); Vapnik-Chervonenkis theory, applications, and NIP theories; Continuous model theory; Generalised stability theory and tame structures. (ii) Model theory of valued fields and applications. The prime focus is on the model theory of Henselian valued fields with the valuation topology, often with extra structure and under assumptions which ensure that definable sets can be understood. Motivic integration; Algebraically closed valued fields, imaginaries, and Berkovich spaces; Valued fields with additional structure; Transseries and surreal numbers; Definable groups. (iii) Applications of model theory in geometry, analysis and number theory. Study of fields with operators and their applications to concrete problems; Applications of the Pila-Wilkie counting theorem.

The emphasis will be on the first two themes, where interactions and collaborations are still at an early stage. Theme (iii) is already well developed, and has connections with both themes (i) and (ii), mainly through concrete algebraic examples. While very present in the programme, it is less central.

We intend to concentrate the activities of theme (i) (around Combinatorics) in the period 15 January - 9 February, leading up to and including the first meeting, and those of theme (ii) (around valued fields) in the period 12 February - 9 March, leading up to and including the second meeting. The third and final meeting will be general, including all three themes. However, we expect to have people from all themes of the programme at any point of time.

### Atelier PARI/GP

Meeting Type: software development workshop

Contact: see conference website

### Description

====== WORKSHOP: 9th Atelier PARI/GP in Besancon ==(First announcement)======

We would like to announce a week-long workshop on the computer algebra system "PARI/GP", from 15th to 19th January 2018, at Besancon University (France).

Website: http://pari.math.u-bordeaux.fr/Events/PARI2018/

Organizers: Bill Allombert Bill.Allombert@math.u-bordeaux.fr Karim Belabas Karim.Belabas@math.u-bordeaux.fr Jean-Robert Belliard jean-robert.belliard@univ-fcomte.fr Marine Rougnant marine.rougnant@univ-fcomte.fr

This workshop is organized to discuss the current and future development of the PARI/GP system. Anyone interested in helping out is welcome !

The workshop will include

(1) Short status reports on the current development projects.

(2) Tutorial sessions.

(3) Brainstorming sessions, to spell out and discuss ideas about the system development: new features, new algorithms, improving old implementations, bug fixes, extensions to GP syntax, documentation overhaul ...

(4) Hacking sessions: inspired by (3), but bring also your own problems !

Please share your ideas for Discussion topics (3) or Coding sessions (4) with the development mailing list pari-dev@pari.math.u-bordeaux.fr. Feel free to suggest subjects for the Tutorial sessions (2).

REGISTRATION: Please register as soon as possible with one of the organizers; participation to the Atelier is free of charge.

FINANCIAL AID: Deadline for financial help application October 15th 2017. Funding to cover travel and local costs is available thanks to the OpenDreamKit project http://opendreamkit.org/. Email Bill.Allombert@math.u-bordeaux.fr to apply, priority will be given to graduate students.

### Riemann-Hilbert correspondences

Meeting Type: summer school, workshop

Contact: see conference website

### Description

Recent groundbreaking developments in the theory of irregular holonomic D-modules have brought to light new relationships among D-module theory and other subjects such as Non Commutative Hodge theory, Mirror Symmetry and Microlocal Analysis. The aim of this event is twofold: to provide an introduction to this new active area for young students and researchers (4 courses on previous developments will be delivered during the first week), and to present the state of the art on the subject (several talks by top international experts are scheduled for the second week). Research talks by young participants are also scheduled during the first week.

## February 2018

### Workshop in Deformation Theory III

Meeting Type: Winter School

Contact: see conference website

### Description

## March 2018

### Arizona Winter School: Iwasawa Theory

Meeting Type: graduate school

Contact: see conference website

### Description

Speakers:

```
John Coates: TBA
David Loeffler and Sarah Zerbes: TBA
Romyar Sharifi: TBA
Christopher Skinner: TBA
```

### Young Perspectives in Algebraic Geometry

Meeting Type: conference

Contact: Stephen Coughlan, Davide Frapporti

### Description

"Young Perspectives in Algebraic Geometry" (YPAG) is an international conference which will take place from 7-9 March 2018 at the Mathematisches Institute, Universität Bayreuth. The main purpose of YPAG is to gather people from Germany and across Europe to present and discuss the research that young algebraic geometers are currently undertaking.

### The Homological Conjectures: Resolved!

Meeting Type: conference

Contact: see conference website

### Description

The homological conjectures in commutative algebra are a network of conjectures that have generated a tremendous amount of activity in the last 50 years. They had largely been resolved for commutative rings that contain a field, but, with the exception of some low dimensional cases, several remained open in mixed characteristic --- until recently, when Yves Andr\'e announced a proof of Hochster's Direct Summand Conjecture. The progress comes from systematically applying Scholze's theory of perfectoid spaces, which had already shown its value by solving formidable problems in number theory and representation theory. One of the goals of the workshop is to cover the ingredients going into the proofs of the Direct Summand Conjecture.

### 32nd Automorphic Forms Workshop

Meeting Type: conference

Contact: see conference website

### Description

ver the last 30 years, the Annual Workshop on Automorphic Forms and Related Topics has remained a small and friendly conference. Those attending range from students to new PhD's to established researchers. For young researchers, the conference has provided support and encouragement. For accomplished researchers, it has provided the opportunity to mentor as well as a forum for exchanging ideas.

The workshop has become internationally recognized for both its high-quality research talks and its supportive atmosphere for junior researchers. Participants present cutting-edge research in all areas related to automorphic forms. These include mock modular forms, Maass wave forms, elliptic curves, Siegel and Jacobi modular forms, special values of L-functions, random matrices, quadratic forms, applications of modular forms, and many other topics.

In addition to research talks, the workshop has, in the past years, featured panel discussion sessions on the topics of grant writing, mentoring and research partnerships, REUs and outreach, and opportunities for international collaborations. Based on the success of these sessions, we have similar panel sessions this year as well.

This year, the 2018 Automorphic Forms Workshop will be held in Medford, Massachusetts at Tufts University. The workshop is being organized by faculty at Tufts University, Amherst College, and Williams College.

### Picard-Fuchs Equations and Hypergeometric Motives

Meeting Type: conference

Contact: see conference website

### Description

## April 2018

### Arbeitsgemeinschaft: Topological Cyclic Homology

Meeting Type: learning workshop

Contact: see conference website

### Description

The Arbeitsgemeinschaft (study group) mainly addresses to non-specialists who want to broaden their outlook on mathematics and to young mathematicians who wish to enter a field for future research. Experts are also welcome. The idea is “learning by doing” – similar to the Seminaire Bourbaki. Participants have to volunteer for one of the lectures described in the program of the Arbeitsgemeinschaft. After the deadline for application the organizers choose the actual speakers to give them enough time to understand the subject and to prepare for their lectures. Please see our website www.mfo.de for further details.

### Algebraic Groups and Geometrization of the Langlands Program

Meeting Type: thematic program

Contact: see conference website

### Description

A thematic trimester in arithmetic will take place in ENS de Lyon and Université Lyon 1 from April 23, 2018 to June 29, 2018. This trimester is divided in two parts with different focus, with a conference taking place from May 22 to May 25.

The first part of the trimester focuses on the theory of algebraic groups, and particularly the Grothendieck-Serre conjecture on locally trivial homogeneous principal spaces. The conjecture was proved by Fedorov and Panin, following work of Colliot-Thélène, Nisnevich, Ojanguren, Ragunathan, Stavrowa, Vavilov...In the arithmetic case, Fedorov proved recently a significant special case of the conjecture. The study of this problem uses, among others, approximation techniques in algebraic groups, patching techniques, and affine grassmanians.

The second part of trimester focuses mainly on the question of the geometrization of the local Langlands correspondence. This problem was born from three major advances in arithmetic geometry: the introduction of the theory of perfectoid spaces by Scholze, the work of V. Lafforgue on the Langlands correspondence for function fields, and the introduction by Fargues and Fontaine of the fundamental curve of p-adic Hodge theory. We will take stock of the latest advances.

## May 2018

### Birational Geometry and Arithmetic

Meeting Type: conference

Contact: Sho Tanimoto

### Description

### Chromatic Homotopy Theory: Journey to the Frontier

Meeting Type: conference and graduate student workshop

Contact: Agnes Beaudry, Markus Pflaum, Mike Hill, Dylan Wilson

### Description

This four day event centered around the topic of Chromatic Homotopy Theory will consist of a graduate student workshop on May 16-17 and research talks by prominent researchers in the field on May 18-20. Participants who are not part of the graduate student workshop are invited arrive on May 17 and take part in the second day of the workshop.

More information will be posted on our website soon.

### Geometry and Topology of 3- manifolds workshop

Meeting Type: workshop

Contact: see conference website

### Description

Some financial support will be available for travel and local expenses for both junior and senior participants. Since the venue has a limited capacity, we ask all interested participants to register/apply through the conference website.

### Rational and Integral Points via Analytic and Geometric Methods

Meeting Type: conference

Contact: see conference website

### Description

## June 2018

### Arithmetic and Algebraic Geometry - a conference in honor of Ofer Gabber on the occasion of his 60th birthday

Meeting Type: conference

Contact: Ahmed Abbes

### Description

### 10th Workshop "STRUCTURAL DYNAMICAL SYSTEMS: Computational Aspects" (SDS 2018)

Meeting Type: workshop

Contact: Alessandro Pugliese

### Description

Aim of the workshop is to put together researchers of different areas, in particular Mathematics and Engineering, and give them the opportunity to discuss, in a friendly atmosphere, recent developments in computational and theoretical methods in several fields of Computational Mathematics and Engineering. In particular, the workshop will be focused on numerical and theoretical aspects of the following topics:

- Mathematical models and simulation in Biology, Medicine and Engineering;
- Innovative numerical methods for ODEs and PDEs;
- Continuous and discrete dynamical systems: theory and numerical methods;
- Fractional calculus: theory, applications and numerical methods;
- Optimal control problems.

### Communicating Mathematics Effectively

Meeting Type: workshop

Contact: Bianca Viray, John Voight

### Description

This week-long workshop is for late-stage graduate students and early-stage postdocs in number theory to learn and develop strategies for giving clear, motivated, and informative talks. While some of the workshop will focus on basic skills like good boardwork and eye contact, the majority of the workshop will be focused on how to effectively convey mathematical ideas to people outside of one's particular specialty in number theory. There will be multiple small breakout sessions where faculty mentors (including the organizers) will give feedback on talks and discuss concrete strategies for preparing and giving talks.

### Emerging Trends in Applied Mathematics and Mechanics 2018

Meeting Type: conference

Contact: Stanislaw Migorski

### Description

This international conference provides an opportunity for dissemination of important and recent results in the field of Applied Mathematics and Mechanics, and their Applications to Physics, Engineering Sciences, Biology and Economy. The conference will bring together mathematicians, interdisciplinary scientists and engineers from all over the world. It is a continuation of the ETAMM2016 Conference which held in 2016 in Perpignan, France. The conference ETAMM2018 will be held from June 18 to June 22, 2018 in Krakow and is organized by the Jagiellonian University which is the oldest university in Poland. The conference will consist of invited plenary talks, keynotes lectures, minisymposia and contributed short talks on recent results and future challenges in the field. The abstract of accepted presentation will be published in the conference abstract book. Selected and peer review papers will be included in a book of proceedings and to be published in special issues of the international journals.

Topics. Applied Mathematics: Biomathematics, Dynamical Systems, Finite Element Methods, Fixed Point Theories, Hemivariational Inequalities, Multi-Level Optimization and Design, Nonconvex and Nonsmooth Analysis and Optimization, Nonlinear Inclusions and Operator Theory, Numerical Analysis and Large Scale Computation, Numerical Methods for ODE and PDE, Optimal Control and Simulations, Partial Differential Equations,

Mechanics: Biomechanics, Buckling Analysis of Large Deformation Structures, Computational Mechanics, Constitutive Laws for Solids, Contact Mechanics, Electronic, Magnetic, Thermoelectric, and Smart Materials, Finite Deformation Elasto-Plasticity, Fluid Structure Interaction, Mathematical Theory and Methods for Phase Transitions and Hysteresis, Non-Newtonian Fluids, Optimization and Design of Structures, Structural Dynamics, Wear, Adhesion, Damage.

### Algebraische Zahlentheorie

Meeting Type: invitational workshop

Contact: see conference website

### Description

Organisers

- Guido Kings, Regensburg
- Ramdorai Sujatha, Vancouver
- Eric Urban, New York
- Otmar Venjakob, Heidelberg

### L-Functions: Open Problems and Current Methods

Meeting Type: summer school

Contact: see conference website

### Description

L-functions are among the key unifying themes of modern number theory: seemingly ubiquitous, one finds them naturally associated to number fields, automorphic forms, abelian varieties, Artin representations, and more.

Central analytic questions about L-functions include their moments, size, non-vanishing, distribution of zeros and have been key to expanding our understanding of the distribution of prime numbers, arithmetic statistics, equidistribution of special points and periods, Diophantine equations, random matrix theory, and quantum chaos. In turn, exciting progress on L-functions is being made using and often combining tools ranging from as far as exponential sums, oscillatory integrals, complex and p-adic analysis to spectral analysis, trace formulas, and algebraic geometry.

This summer school aims to introduce graduate students and young postdocs to a variety of approaches and techniques in the analytic theory of L-functions. The school will emphasize the thinking and intuition underlying various approaches, their use in practice and adaptability to a range of situations, and the organic unity of the subject.

Speakers:

```
Valentin Blomer (Universität Göttingen)
Philippe Michel (Ecole Polytechnique Fédérale de Lausanne)
Djordje Milićević (Bryn Mawr College)
Caroline Turnage-Butterbaugh (Duke University)
Matthew Young (Texas A&M University)
```

## July 2018

### International Conference on Algebra and Related Topics (ICART 2018)

Meeting Type: conference

Contact: Driss Bennis

### Description

We are pleased to announce the "first edition" of the International Conference on Algebra and Related Topics (ICART 2018).

ICART 2018 will be held from the 2nd to the 5th of July 2018 at the Faculty of Sciences, Mohammed V University in Rabat, Morocco.

ICART 2018 will cover various research areas presented in the following three sessions:

- Applied and Computational Homology in Topology, Algebra and Geometry (ACHTAG)
- Homological Algebra, Modules, Rings and Categories (HAMRC)
- Linear and Multilinear Algebra and Function Spaces (LMAFS)

Please, see the website* http://www.fsr.ac.ma/icart2018/ to get more information including the list of Plenary Speakers. Registration will start in October 2017. Deadlines and more information will be also given in October.

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### Higher structures in homotopy theory

Meeting Type: conference

Contact: Clark Barwick, Julie Bergner, Ieke Moerdijk, Stefan Schwede, Paul Goerss

### Description

Part of the Semester Programme "Homotopy Harnessing Higher Structures". This programme will highlight four related themes: the new algebraic topology of differentiable manifolds, derived representation theory and equivariant homotopy theory, the interplay between arithmetic geometry and stable homotopy theory, and the analysis of foundations in these new contexts "the homotopy theory of homotopy theory". This particular workshop will focus on the last of these themes.

### Berkovich spaces 30 years

Meeting Type: conference

Contact: see conference website

### Description

### Canadian Number Theory Association Conference (CNTA XV) -- Laval University

Meeting Type: conference

Contact: Hugo Chapdelaine, Antonio Lei, Claude Levesque

### Description

The Canadian Number Theory Association (CNTA) was founded in 1987 at the International Number Theory Conference at Laval University (Quebec), for the purpose of enhancing and promoting learning and research in number theory, particularly in Canada. To advance these goals, the CNTA organizes bi-annual conferences that showcase new research in number theory, with the aim of exposing Canadian and international students and researchers to the latest developments in the field. The CNTA meetings are among the largest number theory conferences world-wide.

### Summer School on Geometric Representation Theory

Meeting Type: summer school and conference

Contact: Iordan Ganev

### Description

### Algorithmic Number Theory Symposium ANTS-XIII

Meeting Type: conference

Contact: see conference website

### Description

### Witt Vectors, Deformations, and Absolute Geometry

Meeting Type: conference

Contact: see conference website

### Description

### Explicit Methods in Number Theory

Meeting Type: invitational workshop

Contact: see conference website

### Description

Organisers

- Karim Belabas, Bordeaux
- Bjorn Poonen, Cambridge MA
- Fernando Rodriguez Villegas, Trieste

### 2018 ICM satellite conference in Number Theory

Meeting Type: conference

Contact: Henri Darmon, Fred Diamond, Kiran Kedlaya, Aftab Pande, Richard Taylor, Marie-France Vigneras

### Description

Automorphic forms, Galois representations and L-functions, and the interplay among them, have been at the heart of numerous major advances in number theory over the last few decades, from their relevance to long-standing problems such as Fermat's Last Theorem and the Birch and Swinnerton-Dyer Conjecture to their role in the evolution of new research directions such as the the p-adic Langlands program and the theory of perfectoid spaces. The conference will focus on recent developments, with topics that include the Langlands program, special values of L-functions, Shimura varieties and p-adic Hodge theory.

## August 2018

### International Congress of Mathematicians

Meeting Type: international congress

Contact: see conference website

### Description

Satellite conferences will appear later with their own entries.

### Equivariant and motivic homotopy theory

Meeting Type: workshop

Contact: John Greenlees, Lars Hesselholt, Mike Hill, Dan Isaksen, Paul Goerss

### Description

Part of the Semester Program "Homotopy Harnessing Higher Structures." This programme will highlight four related themes: the new algebraic topology of differentiable manifolds, derived representation theory and equivariant homotopy theory, the interplay between arithmetic geometry and stable homotopy theory, and the analysis of foundations in these new contexts "the homotopy theory of homotopy theory". This workshop will focus on equivariant homotopy theory and its applications.

### Arithmetic Geometry, Number Theory, and Computation

Meeting Type: conference

Contact: Bjorn Poonen, Andrew Sutherland

### Description

## September 2018

### Varieties: Arithmetic and Transformations

Meeting Type: conference

Contact: see conference website

### Description

Focus points

- Group actions: Mori Dream Spaces, $T$-varieties, also toric varieties, homogeneous spaces, contact Fano manifolds, Cremona groups, actions of finite groups, $\mathbb{G}_a$ and $\mathbb{G}_m$ actions on affine varieties,
- Arithmetic: arithmetic aspects of differential equations, $p$-adic cohomologies, crystals, automorphic forms, Calabi-Yau varieties, arithmetic aspects of mirror symmetry, finding rational points on manifolds,
- Parametrizing varieties: Hilbert scheme of points, rational curves on manifolds, secant varieties, tensor ranks, Waring ranks and related notions with their applications to complexity theory, engineering and quantum physics

### Derived algebraic geometry and chromatic homotopy theory

Meeting Type: conference

Contact: Mark Behrens, David Gepner, Paul Goerss, Mike Hopkins, Tyler Lawson,

### Description

Part of the Semester Program "Homotopy Harnessing Higher Structures." This programme will highlight four related themes: the new algebraic topology of differentiable manifolds, derived representation theory and equivariant homotopy theory, the interplay between arithmetic geometry and stable homotopy theory, and the analysis of foundations in these new contexts "the homotopy theory of homotopy theory". This workshop will focus on derived algebraic geometry and the interplay with stable homotopy theory.

### Special Values of Automorphic L-functions and Associated p-adic L-Functions

Meeting Type: conference

Contact: see conference website

### Description

## December 2018

### Manifolds

Meeting Type: workshop

Contact: David Ayala, Oscar Randal-Williams, Ulrike Tillmann, Michael Weiss, Paul Goerss

### Description

Part of the Semester Program "Homotopy Harnessing Higher Structures." This programme will highlight four related themes: the new algebraic topology of differentiable manifolds, derived representation theory and equivariant homotopy theory, the interplay between arithmetic geometry and stable homotopy theory, and the analysis of foundations in these new contexts "the homotopy theory of homotopy theory". This workshop will focus on the algebraic topology of manifolds.

### Symplectic geometry and homotopy theory

Meeting Type: conference

Contact: Mohammed Abouzaid

### Description

FRG-supported conference on the interaction between symplectic topology and homotopy theory.

## 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.

### Connections for Women: Derived Algebraic Geometry, Birational Geometry and Moduli Spaces

Meeting Type: conference

Contact: see conference website

### Description

This workshop will be on different aspects of Algebraic Geometry relating Derived Algebraic Geometry and Birational Geometry. In particular the workshop will focus on connections to other branches of mathematics and open problems. There will be some colloquium style lectures as well as shorter research talks. The workshop is open to all.

### Introductory Workshop: Derived Algebraic Geometry and Birational Geometry and Moduli Spaces

Meeting Type: conference

Contact: see conference website

### Description

The workshop will survey several areas of algebraic geometry, providing an introduction to the two main programs hosted by MSRI in Spring 2019. It will consist of 6 expository mini-courses and 8 separate lectures, each given by top experts in the field.

The focus of the workshop will be the recent progress in derived algebraic geometry, birational geometry and moduli spaces. The lectures will be aimed at a wide audience including advanced graduate students and postdocs with a background in algebraic geometry.

## March 2019

### 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.

## 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.