On conjugacy separability of some Coxeter groups and parabolic-preserving automorphisms

Pierre-Emmanuel Caprace, Ashot Minasyan
2013 Illinois Journal of Mathematics  
We prove that even Coxeter groups, whose Coxeter diagrams contain no (4, 4, 2) triangles, are conjugacy separable. In particular, this applies to all right-angled Coxeter groups or word hyperbolic even Coxeter groups. For an arbitrary Coxeter group W , we also study the relationship between Coxeter generating sets that give rise to the same collection of parabolic subgroups. As an application we show that if an automorphism of W preserves the conjugacy class of every sufficiently short element
more » ... ntly short element then it is inner. We then derive consequences for the outer automorphism groups of Coxeter groups.
doi:10.1215/ijm/1408453592 fatcat:7rn4tpuq3rezjk24lmigcdj4la