03/27/2012 - 12:15pm

03/27/2012 - 1:10pm

Speaker:

Rostislav Grigorchuk (Texas A&M University)

Abstract:

I will describe topologies in the space of subgroups of a group and in the space of Schreier graphs. Then I will discuss totally non-free actions as antipode to the free actions and Schreier dynamical systems. Finally I will introduce the concept of IRS (invariant random subgroup), and will describe two examples related to the group of intermediate growth constructed by the speaker in the 80th and to the famous R. Thompson's group F.

Where:

Millikan 208 (Pomona College)

Misc. Information:

Professor Grigorchuk will also give a *Colloquium talk* on Wednesday, 3/28/12.