Seminar series
Date
Wed, 23 Jan 2019
16:00
16:00
Location
C1
Speaker
Richard Wade
Organisation
Oxford University
I will give a description of a method introduced by N. Ivanov to study the abstract commensurator of a group by using a rigid action of that group on a graph. We will sketch Ivanov's theorem regarding the abstract commensurator of a mapping class group. Time permitting, I will describe how these methods are used in some of my recent work with Horbez on outer automorphism groups of free groups.