# Timothée Marquis: Cyclically reduced elements in Coxeter groups

**Time: **
Wed 2020-10-14 13.15 - 15.00

**Location: **
Zoom meeting ID: 657 9019 8929

**Participating: **
Timothée Marquis, UCLouvain

### Abstract

Let W be a Coxeter group. We provide a precise description of the conjugacy classes in W, yielding an analogue of Matsumoto's theorem for the conjugacy problem in arbitrary Coxeter groups. This extends to all Coxeter groups an important result on finite Coxeter groups by M. Geck and G. Pfeiffer from 1993. In particular, we describe the cyclically reduced elements of W, thereby proving a conjecture of A. Cohen from 1994.

**Zoom Notes:** The Meeting ID and Passcode will be recurring and should work every Wednesday. The password has been sent out on the department mailing lists. Please email
Wushi Goldring
if you are not on these mailing lists and are interested in attending.