During the academic year 2019-2020, I am organizing the weekly seminar Groups, Actions and von Neumann algebras at the Université Paris-Sud, Orsay.

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

#### Next Meetings

##### Monday November 25

Amine Marrakchi (CNRS & ENS Lyon)

*Ergodic theory of affine isometric actions on Hilbert spaces*

##### Monday December 2

Sven Raum (Stockholm University)

*tba*

##### Monday December 9

Michiya Mori (The University of Tokyo)

*Lattice isomorphisms between projection lattices of von Neumann algebras*

#### Previous Meetings

##### Monday September 23

Cyril Houdayer (Université Paris-Sud)

*Stationary characters on lattices of semisimple Lie groups (part I)*

##### Monday September 30

Cyril Houdayer (Université Paris-Sud)

*Stationary characters on lattices of semisimple Lie groups (part II)*

##### Monday October 14

Jean Lécureux (Université Paris-Sud)

*Strong property (T) for groups acting on affine buildings*

##### Monday November 18

Yusuke Isono (RIMS, Kyoto University)

*Unitary conjugacy for type III subfactors and W*-superrigidity*