### Conferences - Seminars

25JAN

13:15-14:15
MA A1 10

## Coloring the Voronoi tessellation of lattices

In this talk I will introduce the chromatic number of a lattice: It is the least number of colors one needs to color the interiors of the cells of the Voronoi tessellation of a lattice so that no two cells sharing a facet are of the same color. I will introduce two lower bounds for ...
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By Frank Vallentin (Universität zu Köln)

25JAN

15:00-17:00
CM 1 4

## Statistical Field Theory and the Ising Model

The developments of statistical mechanics and of quantum field theory are among the major achievements of 20th century's science. In the second half of the century, these two subjects started to converge, resulting in some of the most remarkable successes of mathematical physics. At the heart of this convergence lies the conjecture that critical lattice ...
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By Prof. Clément Hongler

26JAN

By Jean-Pierre Serre, College de France

01FEB

16:15-17:15
CM 1 4

## Existence de représentations supersingulières sur un corps de caractéristique p

La classification par Breuil de ces représentations pour GL(2,Qp) a été le point de départ de la correspondance de Langlands p-adique reliant représentations de GL(2,Qp) et représentations du groupe de Galois absolu Gal de Qp. Elles correspondent aux représentations irréductibles de dimension 2 de Gal sur un corps de caractéristique p. Pourquoi ces représentations sont-elles ...
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By Prof. Marie-France Vigneras

05FEB

09FEB

09FEB

09:00-17:00
BI A0 448

## Borel combinatorics and ergodic theory conference

The study of measurable group actions on standard Borel spaces is of central importance both in descriptive set theory and ergodic theory. In recent years, the study of (definable) combinatorial structures (such as graphs, simplicial complexes, geometric objects...) has shown itself to be a powerful tool for understanding group actions and also to see what ...
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08FEB

17:15-18:15
BI A0 448

## Professor Steve Jackson Bernoulli Lecture - Undecidability in the Theory of Abelian Group Actions

The combinatorics of abelian group actions on Polish spaces has been the subject of recent investigation, and is (somewhat surprisingly) interesting and non-trivial. If one considers the actions of Zn, we see a pattern develop: problems which are easy for n=1 become much more difficult for n at least 2. We discuss three example of ...
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By Steve

**Jackson**(University of North Texas)
20FEB

10:15-11:15
CM 0 12

## Topology Seminar: Classical and noncommutative Voevodsky's conjecture for cubic fourfolds and Gushel-Mukai fourfolds

In a seminal paper, Voevodsky introduced the smash-nilpotence equivalence relation on the group of algebraic cycles on a smooth projective variety. He also conjectured that the nilpotence equivalence corresponds to the classical numerical equivalence on cycles. More recently, Bernardara, Marcolli and Tabuada defined a noncommutative version of this conjecture for smooth and proper dg categories. ...
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By Laura Pertusi (University of Milan)

09MAR

By Prof. Paolo Marcellini, University of Firenze

13MAR

16:15-17:15
CM 0 11

## Climate models: their functioning, projections, and uncertainties

Climate models have been the focus of much attention in the past three decades; indeed, they have been instrumental in highlighting the causes and consequences of anthropogenic climate change, and their results have largely contributed to climate policy and, in particular, the 2015 Paris Climate Accord. In this talk, we shall briefly outline the underlying ...
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By

**Prof. Martin BENISTON**(Institute for Environmental Sciences, The University of ...
19MAR

23MAR

23MAR

09:00-17:00
BI A0 448

## Structure and dynamics of Polish groups conference

Polish topological groups comprise all locally compact second countable groups, but also most interesting topological transformation groups such as homeomorphism and diffeomorphism groups of compact manifolds, isometry groups of separable complete metric spaces, and automorphism groups of countable model theoretical structures. While all of these classes had been intensively studied separately, there has recently been ...
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26MAR

29MAR

29MAR

09:00-17:00
BI A0 448

## Large scale geometry of Polish groups workshop

The topic of this workshop will be geometric group theory in a larger context. As is well known, there are close links between geometric group theory of finitely generated or locally compact groups and geometric non-linear functional analysis, i.e., the non-linear geometry of Banach spaces. While this has for a long time been seen as ...
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27MAR

17:15-18:15
BI A0 448

## Professor Mikhail Gromov Bernoulli Lecture - What is Probability?

The success of the probability theory in mathematics and theoretical physics is due not so much to its measure theoretic foundation but because it exploits and enhances symmetries of the structures it applies to. We shall describe in this lecture two alternative approaches to the concept of probability, where the first one is motivated by ...
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By Mikhail

**Gromov**(Université Paris-Saclay)
04JUN

08JUN

08JUN

09:00-17:00
BI A0 448

## Ideals and exceptional sets in Polish spaces

Exceptional sets play an important role in numerous branches of mathematics, for instance in measure theory, topology, harmonic and complex analysis, Banach space theory, algebraic geometry, combinatorics, probability and ergodic theory, set theory and descriptive set theory, just to mention a few. Exceptional sets describe notions of smallness from various points of view, some notable ...
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18JUN

22JUN

22JUN

09:00-17:00
BI A0 448

## Descriptive set theory conference

This is the last conference of the semester and will be of a more general nature than the earlier more specialized conferences and workshops of the program. It will cover broad aspects of descriptive set theory and its connections with other areas of mathematics.
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16JUL

27JUL

27JUL

09:00-17:00
BI A0 448

## Introduction to Partition Functions

A mix of introductory lectures and research talks on partition functions and techniques for their computation, including methods such as Markov chains, correlation decay, belief propagation and convex optimization.
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01OCT

05OCT

05OCT

09:00-17:00
BI A0 448

## Theoretical Challenges in Partition Functions

The goal of this workshop is to find translations and connections between various approaches to compute partition functions and, at the same time, advance the state-of-the-art in each.
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12NOV

16NOV

16NOV

09:00-17:00
BI A0 448

## Applications of Partition Functions

The goal of this workshop is to discuss the wide set of practical and theoretical applications of the computability of partition functions and address the challenges that arise.
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