A condition that prevents groups from acting nontrivially on trees
arXiv:0904.1384 · doi:10.2140/gtm.2008.14.129
Abstract
We describe a simple criterion for showing that a group has Serre's property FA. By exhibiting a certain pattern of finite subgroups, we show that this criterion is satisfied by Aut(F_n) and SL(n,Z) when n>=3.
This is the version published by Geometry & Topology Monographs on 29 April 2008