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On hyperbolic Coxeter polytopes with mutually intersecting facets

Anna Felikson, Pavel Tumarkin

math.MGarXiv:math/0604248

Abstract

We prove that, apart from some well-known low-dimensional examples, any compact hyperbolic Coxeter polytope has a pair of disjoint facets. This is one of very few known general results concerning combinatorics of compact hyperbolic Coxeter polytopes. We also obtain a similar result for simple non-compact polytopes.

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