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The FAn Conjecture for Coxeter groups

Angela Kubena Barnhill
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Abstract

We study global fixed points for actions of Coxeter groups on nonpositively curved singular spaces. In particular, we consider property FA_n, an analogue of Serre's property FA for actions on CAT(0) complexes. Property FA_n has implications for irreducible representations and complex of groups decompositions. In this paper, we give a specific condition on Coxeter presentations that implies FA_n and show that this condition is in fact equivalent to FA_n for n=1 and 2. As part of the proof, we compute the Gersten-Stallings angles between special subgroups of Coxeter groups.

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Angela Kubena Barnhill. 2009-06-30. The FAn Conjecture for Coxeter groups. https://doi.org/10.2140/agt.2006.6.2117

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