Rachel Skipper : The Cantor-Bendixson rank of the Grigorchuk group

Posted by Filippo Calderoni , part of the Logic Seminar.

At

Nov. 24, 2020, 2 p.m.

In

Zoom

Abstract

The space of subgroups of a group has a natural Polish topology and understanding this space can help to understand the group. In this talk, we will consider the Cantor-Bendixson derivative and rank for the space of subgroups of the Grigorchuk group, using it to stratify the subgroups of this group.