Reflection Groups and Polytopes over Finite Fields, III

Details Reflection Groups and Polytopes over Finite Fields, III Reflection Groups and Polytopes over Finite Fields, III

2007-07-26

arxiv.org/abs/0707.4007v1

Mathematics

Combinatorics

Advances in Applied Mathematics (to appear); 19 pages

Scientific paper

When the standard representation of a crystallographic Coxeter group is reduced modulo an odd prime p, one obtains a finite group G^p acting on some orthogonal space over Z_p . If the Coxeter group has a string diagram, then G^p will often be the automorphism group of a finite abstract regular polytope. In parts I and II we established the basics of this construction and enumerated the polytopes associated to groups of rank at most 4, as well as all groups of spherical or Euclidean type. Here we extend the range of our earlier criteria for the polytopality of G^p . Building on this we investigate the class of 3-infinity groups of general rank, and then complete a survey of those locally toroidal polytopes which can be described by our construction.

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