### Conferences - Seminars

21MAR

13:00-14:00
GR A3 30

## Maximal representations of complex hyperbolic lattices in infinite dimension.

Unlike lattices in higher rank, lattices of simple Lie groups in rank 1 are not rigid. This gives rise to the Teichmüller spaces for example. For representations of lattices of the isometry group of the complex hyperbolic lattices in Hermitian Lie groups, the Kähler form yields a numerical invariant, the Toledo number. When this number ...
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By Bruno Duchesne (Nancy)

26MAR

03APR

03APR

08:00-18:00
GA 3 21

## Big data and uncertainty quantification: statistical inference and information-theoretic techniques applied to computational chemistry

An incentive to use coarse-grained models is to use them for inference and control instead of the original (often intractable) model. Since coarse-grained models are always “wrong”, questions such as inference under model misspecification or goal-oriented uncertainty quantification (e.g. for control) come into play. This workshop will address such topics, with a special focus on ...
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By Carsten

**Hartmann**, BTU Cottbus-Senftenberg Fabio**Nobile**, EPFL Frank**Pinski**, University ...
26MAR

10:15-11:15
MA A1 12

## A new approach to the Dold-Thom theorem

The Dold-Thom theorem is a classical result in algebraic topology giving isomorphisms between the homology groups of a space and the homotopy groups of its infinite symmetric product. The goal of this talk is to outline a new proof of this theorem, which is direct and geometric in nature. The heart of this proof is ...
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By Lauren Bandklayder

05APR

14:15-15:15
MA B1 11

## Existence of quasipatterns in the superposition of two hexagonal periodic patterns

Abstract: Let us consider a quasilattice, spanned by the superposition of two hexagonal lattices in the plane, differing by a rotation of angle ß. We study bifurcating quasipattern solutions of the Swift-Hohenberg PDE, built on such a quasilattice, invariant under rotations of angle π /3. For nearly all ß, this is a small divisor problem. ...
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By

*Prof.**Gérard***IOOSS***(*Prof. IUF émérite, LJAD, Nice)
10APR

14:00-15:00
MA A3 31

## Weyl groups : involutions, and mod 2 cohomology

Groups, Arithmetic and Algebraic Geometry Seminar
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By Jean-Pierre Serre (Paris)