## Dynamics, Geometry, & Groups Seminar

### Thursday, January 28th, 2021

**Time:** 1:30 p.m** Place:**

**Speaker:** Marcin Sabok (McGill University)

**Title:** Hyperfiniteness at Gromov boundaries.

**Abstract:** I will discuss recent results establishing hyperfiniteness of equivalence relations induced by actions on Gromov boundaries of various hyperbolic spaces. This includes boundary actions of hyperbolic groups (joint work with T. Marquis) and actions of the mapping class group on boundaries of the arc graph and the curve graph (joint work with P. Przytycki).