Essential hyperbolic Coxeter polytopes

Details Essential hyperbolic Coxeter polytopes Essential hyperbolic Coxeter polytopes

2009-06-22

arxiv.org/abs/0906.4111v2

Mathematics

Combinatorics

IHES preprint; 39 pages, a lot of figures; v2: minor changes, a conjecture on finiteness of the number of essential polytopes

Scientific paper

We introduce a notion of essential hyperbolic Coxeter polytope as a polytope which fits some minimality conditions. The problem of classification of hyperbolic reflection groups can be easily reduced to classification of essential Coxeter polytopes. We determine a potentially large combinatorial class of polytopes containing, in particular, all the compact hyperbolic Coxeter polytopes of dimension at least 6 which are known to be essential, and prove that this class contains finitely many polytopes only. We also construct an effective algorithm of classifying polytopes from this class, realize it in four-dimensional case, and formulate a conjecture on finiteness of the number of essential polytopes.

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