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• #### On Reflection Subgroups of Finite Coxeter Groups ﻿

[OWP-2011-06] (Mathematisches Forschungsinstitut Oberwolfach, 2011-05-9)
Let $W$ be a finite Coxeter group. We classify the reflection subgroups of $W$ up to conjugacy and give necessary and sufficient conditions for the map that assigns to a reflection subgroup $R$ of $W$ the conjugacy class ...