Counting perfect colourings of plane regular tilings

Details Counting perfect colourings of plane regular tilings Counting perfect colourings of plane regular tilings

2008-07-29

arxiv.org/abs/0807.4630v1

Mathematics

Combinatorics

6 pages, 1 figure, accepted for Z. Krist

Scientific paper

A first step in investigating colour symmetries of periodic and nonperiodic patterns is determining the number of colours which allow perfect colourings of the pattern under consideration. A perfect colouring is one where each symmetry of the uncoloured pattern induces a global permutation of the colours. Two cases are distinguished: Either perfect colourings with respect to all symmetries, or with respect to orientation preserving symmetries only (no reflections). For the important class of colourings of regular tilings (and some Laves tilings) of the Euclidean or hyperbolic plane, this mainly combinatorial question is addressed here using group theoretical methods.

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