Groups acting on $\mathbb{R}$-trees

18 February 2015
16:00
Alexander Margolis
Abstract

In Bass-Serre theory, one derives structural properties of groups from their actions on simplicial trees. In this talk, we introduce the theory of groups acting on $\mathbb{R}$-trees. In particular, we explain how the Rips machine is used to classify finitely generated groups which act freely on $\mathbb{R}$-trees.

  • Junior Topology and Group Theory Seminar