Cyril Houdayer

Professor of Mathematics

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      • GAN 2016-2017
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GAN 2017-2018

During the academic year 2017-2018, Romain Tessera and I organized the weekly seminar Groups, Actions and von Neumann algebras at the Université Paris-Sud, Orsay.

The seminar featured both research and introductory talks on topics including geometric and measured group theory, ergodic theory and von Neumann algebras.

Meetings

Monday September 25

Narutaka Ozawa (RIMS Kyoto University)

Finite-dimensional representations constructed from random walks

Monday October 2

Cyril Houdayer (Université Paris-Sud)

The Kadison-Singer Problem (Part 1) 

Monday October 9

Cyril Houdayer (Université Paris-Sud)

The Kadison-Singer Problem (Part 2)

Monday November 6

Amine Marrakchi (Université Paris-Sud)

The Kadison-Singer Problem (Part 3)

Tuesday November 7

Jérémie Brieussel (Université de Montpellier)

Shalom’s property HFD and Z-extensions of locally finite groups

Monday November 27

Romain Tessera (CNRS & Université Paris-Sud)

The Kadison-Singer Problem (Part 4)

Monday February 5

Yves de Cornulier (CNRS & Université Lyon 1)

Near actions

Monday February 12

Isaac Goldbring (University of California at Irvine)

Embedding problems, games, and square roots

Monday February 19

Stefan Witzel (Bielefeld University)

Simple groups separated by finiteness properties

Monday March 19

Piotr Nowak (Polish Academy of Sciences)

Property (T) for Aut(F_5)

Monday March 26

Federico Vigolo (University of Oxford)

Warped systems of actions on metric spaces

Monday April 9

Johannes Cuno (Ecole Normale Supérieure)

Random walks on Baumslag-Solitar groups

 Monday April 16

Stefan Jung (Saarland University)

Partition quantum spaces

Monday April 23

Yair Hartman (Northwestern University)

Stationary C*-dynamical systems

Monday June 4

Simon André (Université de Rennes)

Hyperbolicity and first-order logic

Monday June 18

Amine Marrakchi (Université Paris-Sud)

PhD defense

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