Abstract
It is well known that the unique 7-vertex triangulation of the 2-dimensional torus S1×S1 is a consequence of the relationship between two hexagonal lattices in the euclidean plane: it is just the quotient of the triangular tessellation of the plane by a translation group. Each vertex star is a regular hexagon and the symmetry group of this triangulation is the affine group A(1,ℤ7) in one dimension over ℤ7. In this paper we describe a particular 15-vertex triangulation of the 3-dimensional torus S1×S1×S1 whose symmetry group is the affine group A(1,ℤ15) and which is similarly related to two lattices in euclidean 3-space: it is just the quotient of a particular tessellation of 3-space by a translation group. Each vertex star happens to be a rhombidodecahedron, the dual of a (semiregular) cuboctahedron.
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Kühnel, W., Lassmann, G. The rhombidodecahedral tessellation of 3-space and a particular 15-vertex triangulation of the 3-dimensional torus. Manuscripta Math 49, 61–77 (1984). https://doi.org/10.1007/BF01174871
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DOI: https://doi.org/10.1007/BF01174871