Planar coincidences for N-fold symmetry

Details Planar coincidences for N-fold symmetry Planar coincidences for N-fold symmetry

2005-11-06

arxiv.org/abs/math/0511147v1

J. Math. Phys. 37 (1996) 1029-1058

Mathematics

Metric Geometry

38 pages, 4 figures; updated and slightly corrected version of a paper published in J. Math. Phys. (see below)

Scientific paper

10.1063/1.531424

The coincidence problem for planar patterns with $N$-fold symmetry is considered. For the N-fold symmetric module with $N<46$, all isometries of the plane are classified that result in coincidences of finite index. This is done by reformulating the problem in terms of algebraic number fields and using prime factorization. The more complicated case $N \ge 46$ is briefly discussed and N=46 is described explicitly. The results of the coincidence problem also solve the problem of colour lattices in two dimensions and its natural generalization to colour modules.

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