Group actions on R-trees and the topology of outer space

Specialeforsvar: Xiao Yuxuan

Titel: Group actions on R-trees and the topology of outer space

Abstract: The goal of our article is to understand the theorem by Culler and Vogtmann that outer space is contractible. To do this, we also need some knowledge about group actions on R-trees by Culler and Morgan. 

Vejleder:  Jan Paul Steinebrunner
Censor:   Carsten Lunde Petersen, RUC