Conference in honor of Alexander Kechris, focusing on Descriptive Set Theory and its applications to other fields of mathematics.

For more details on the workshop see https://www.mfo.de/www/activity/2646 .

Applications to participate in the Oberwolfach workshop can be submitted through the following form:

https://forms.gle/E9X7Z6m6xomndBjH8 .

The deadline for full consideration is 18 January 2026.

For further information, please visit the website

The nineteenth annual Binghamton University Graduate Combinatorics Algebra and Topology Conference (BUGCAT Conference) will meet November 21-22, 2026 at Binghamton University. Graduate students at all levels, as well as faculty, are invited to give a 20-minute talk; talks may be expository or on current research. This year, we have three distinguished keynote speakers: Casey Donoven (Montana State University Northern), Ben Knudsen (Colorado State University) and Pablo Soberón (City University of New York).

This workshop is sponsored by AIM, NSF, and the Simons Foundation. This activity, which is a part of the New Structures in Low-dimensional topology collaboration, will be devoted to developing an approach to q-series invariants of 3-manifolds and knots via 2-representation theory. Verma modules play a key role in the construction of an analogue for a generic parameter q of the Reshetikhin-Turaev invariants. The workshop will consider the categorification of Verma modules constructed by Naisse-Vaz, their duals and tensor products, as well as braidings and traces. The goal is to apply these constructions to 3-dimensional topology and relate them to known invariants.

Main topics for the workshop are:

• determination of tensor products of 2-Verma modules, braidings and traces
• relation with the Dupont-Naisse construction
• extension to the case of tensor products of 2-Verma modules and their duals
• construction of homological invariants of particular knots and 3-manifolds

Gruppen und topologische Gruppen is a two-days conference organized every semester since 1972. It is devoted mainly to group theory and topological group theory, and related topics. The GtG meeting in winter 2027 will be held at the University of Udine (Italy). The conference starts on Friday 22 January 2027 in the morning and finishes on Saturday 23 January 2027 before lunch. Participants are invited to deliver contributed talks. Registration is available until 15 November 2026.

This workshop aims to bring together experts in the field to share their recent results on cutting-edge topics. Key topics include homological stability for Hurwitz spaces and the stacky perspective on counting problems. The workshop will also cover motivic approaches to counting and the new challenges of generalizing classical results to the wild case. We encourage participants to discuss ways to unify these ideas for further development.

Keywords: Hurwitz spaces (Homological stability), Malle's conjecture (for function fields), Rational points of stacks, Brauer-Manin obstruction (for stacks), Wild Galois extensions of function fields and power series fields (counting results, moduli spaces), Motivic counting of Galois extensions.

This event is part of the special year "Arithmetic, Homotopy, and Geometry 2027-28".

A three day crash course into the OSCAR computer algebra system at TU Berlin, a week before the SIAM AG 2027 in Osnabrueck, focusing on topics around applied algebraic geometry. Both beginners and experienced programmers are welcome!

For beginners, the first two days will cover the basics of programming in Julia and OSCAR. For experienced programmers, the first two days will cover advanced topics such as the internals of OSCAR. The final day will feature parallel tracks dedicated to specialized topics, such as:

• algebraic statistics
• polynomial system solving
• tropical geometry
• etc

We expect funding to be available to support early career researchers. More info to come. If you are interested and want to be kept in the loop, please contact the organizers.

This is a week-long summer school about recent research trends in the Langlands program, broadly construed. It aims to continue in the tradition of the influential 1977 Corvallis summer institute by giving early-career researchers an accessible introduction to the current directions of research in this highly active and exciting field. We are hoping to introduce participants to the many open questions and opportunities for progress within the Langlands program and to allow those who may already be working on Langlands-adjacent areas to see the full landscape of this program.