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On colourings of cubic lattices - a tribute to Heinrich Heesch
1Ludwig-Maximilians-Universität München, Sektion Kristallographie, Theresienstrasse 41, 80333 München, Germany.
Abstract:
Given the integral lattice Λd in d-dimensional Euclidean space, partitions of the lattice nodes into orbits of finite-index subgroups of Aut(Λd) have been computed for d ≤ 4. These partitions can be interpreted as colourings of orbits defined up to permutations of colours. Complete results are obtained for d = 2 up to 64 orbits, for d = 3 up to eight orbits, and for two orbits in dimension 4. The automorphism groups of the partitions are also determined. Our results for two orbits in dimension 3 correct the old result of Heesch [Z. Kristallogr. (1933), 85, 335-344] who overlooked one partition.
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