Seminar series
Date
Wed, 25 Apr 2012
Time
16:00 -
17:00
Location
SR2
Speaker
Moritz Rodenhausen
A construction by McCool gives rise to a finite presentation for the stabiliser of a finite set of conjugacy classes in a free group under the action of Aut(F_n) or Out(F_n). An important concept of my talk are rigid elements, which will allow to simplify these huge presentations. Finally I will sketch applications to centralisers in Aut(F_n).