##### Department of Mathematics,

University of California San Diego

****************************

### Math 211B - Group Actions Seminar

## Konrad Wrobel

#### McGill University

## Orbit equivalence and wreath products

##### Abstract:

We prove various antirigidity and rigidity results around the orbit equivalence of wreath product actions. Let $F$ be a nonabelian free group. In particular, we show that the wreath products $A \wr F$ and $B \wr F$ are orbit equivalent for any pair of nontrivial amenable groups $A$, $B$. This is joint work with Robin Tucker-Drob.

Host: Brandon Seward

### October 13, 2022

### 10:00 AM

Zoom ID 967 4109 3409

(email an organizer for the password)

Research Areas

Ergodic Theory and Dynamical Systems****************************