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Reflection subgroups of odd-angled Coxeter groups

Published 18 Nov 2012 in math.GR | (1211.4194v2)

Abstract: We give a criterion for a finitely generated odd-angled Coxeter group to have a proper finite index subgroup generated by reflections. The answer is given in terms of the least prime divisors of the exponents of the Coxeter relations.

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