### Conferences - Seminars

26APR

13:00-14:00
MA A3 30

## Groups acting on rooted trees and representations on the boundary

Every action of a group on a rooted tree induces an action on the boundary of the tree. This action yields various representations of the group on spaces of functions on the boundary. In this talk we discuss the structure of such representations. After reviewing of the basic concepts, we will introduce locally 2-transitive actions ...
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By Steffen Kionke (KIT)

27APR

15:15-16:00
MA A1 10

## A Bayesian General Linear Modeling Approach to Cortical Surface fMRI Data Analysis

By Ass. Prof. David Bolin, Chalmers University of Technology

01MAY

10:15-11:30
CM 1 113

## Topology Seminar: C*-superrigidiity of nilpotent groups

It is a classical problem to recover a discrete group from various rings or algebras associated with it, such as the integral group ring (cf. the Whitehead group and the Whitehead torsion). By analogy, in an operator algebraic framework we want to recover torsion-free groups from certain topological completions of the complex group ring, such ...
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By Sven Raum (EPFL)

08MAY

10:15-11:15
CM 1 113

## Topology Seminar: Stratified homotopy theory

Stratified spaces appear as natural objects in singularity theory. Goresky and MacPherson introduced intersection cohomology to extend cohomological properties of closed manifolds to stratified spaces, and it proved to be a powerful tool to study those objects. However, intersection cohomology is not homotopy invariant, rather it is invariant with respect to homotopies that "preserve" the ...
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By Sylvain Douteau (Université de Picardie)

15MAY

09:15-10:15
CM 1 113

## Topology Seminar: Combinatorial models for stable homotopy theory

We will recall the definition of dendroidal sets as a generalization of simplicial sets, and present the connection (Quillen equivalence) to connective spectra which gives a factorization of the so-called K-theory spectrum functor from symmetric monoidal categories to spectra. We will present a common generalization of two results of Thomason: 1) posets model all homotopy ...
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By Matija Bašić (University of Zagreb)

15MAY

By Dr Tommaso TADDEI (Université Pierre et Marie Curie, FR)

24MAY

15:15-16:00
MA A1 10

## Learning determinantal point processes

Statistics seminar
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By Prof. Philippe Rigollet, MIT