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arXiv · 1211.4194

Reflection subgroups of odd-angled Coxeter groups

Anna Felikson·Jessica Fintzen·Pavel Tumarkin
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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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Anna Felikson, Jessica Fintzen, Pavel Tumarkin. 2012-11-18. Reflection subgroups of odd-angled Coxeter groups. https://doi.org/10.1016/j.jcta.2014.04.008

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