Seminar series
Date
Wed, 21 Jan 2026
Time
16:00 -
17:00
Location
L4
Speaker
Andrew Ng
Organisation
Bonn
I will report on ongoing joint work with Sam Fisher on showing that the mapping class group has a finite index subgroup whose group ring embeds in a division ring. Our methods involve p-adic analytic groups, but no prior knowledge of this will be assumed and much of the talk will be devoted to explaining some of the underlying theory. Time permitting, I will also discuss some consequences for the profinite topology for the mapping class group and potential extensions to Out(RAAG).