Seminar series
Date
Tue, 09 Oct 2012
17:00
17:00
Location
L2
Speaker
Nikolay Nikolov
Organisation
University of Oxford
We prove that the rank gradient vanishes for mapping class groups, Aut(Fn) for all n, Out(Fn), n > 2 and any Artin group whose underlying graph is connected. We compute the rank gradient and verify that it is equal to the first L2-Betti number for some classes of Coxeter groups.