Reflection subgroups of Coxeter groups

Felikson, Anna
Independent University of Moscow, Russia  Department of Mathematics, University of Fribourg, Switzerland

Tumarkin, Pavel
Independent University of Moscow, Russia  Department of Mathematics, Michigan State University, East Lansing, USA
Published in:
 Transactions of the American Mathematical Society.  2010, vol. 362, p. 847858.
English
We use the geometry of the Davis complex of a Coxeter group to investigate finite index reflection subgroups of Coxeter groups. The main result is the following: if $ G$ is an infinite indecomposable Coxeter group and $ H\subset G$ is a finite index reflection subgroup, then the rank of $ H$ is not less than the rank of $ G$. This generalizes earlier results of the authors (2004). We also describe the relationship between the nerves of the group and the subgroup in the case of equal rank

Faculty
 Faculté des sciences

Department
 Département de Mathématiques

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Mathematics

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https://folia.unifr.ch/unifr/documents/301410
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