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6-demicubic honeycomb
(No image)
Type Uniform honeycomb
Family Alternated hypercube honeycomb
Schläfli symbol h{4,3,3,3,3,4}
Coxeter diagram Template:CDD or Template:CDD
Template:CDD
Template:CDD
Facets {3,3,3,3,4}
h{4,3,3,3,3}
Vertex figure t1{3,3,3,3,4}
Coxeter group B~6 [4,3,3,3,31,1]
D~6 [31,1,3,3,31,1]

The 6-demicubic honeycomb or demihexeractic honeycube is a uniform space-filling tessellation (or honeycomb) in Euclidean 6-space. It is constructed as an alternation of the regular 6-cube honeycomb.

It is composed of two different types of facets. The 6-cubes become alternated into 6-demicubes h{4,3,3,3,3} and the alternated vertices create 6-orthoplex {3,3,3,3,4} facets.

D6 lattice

The vertex arrangement of the 6-demicubic honeycomb is the D6 lattice.[1] The 60 vertices of the rectified 6-orthoplex vertex figure of the 6-demicubic honeycomb reflect the kissing number 60 of this lattice.[2] The best known is 72, from the E6 lattice and the 222 honeycomb.

The DTemplate:Sup sub lattice (also called DTemplate:Sup sub) can be constructed by the union of two D6 lattices. This packing is only a lattice for even dimensions. The kissing number is 25=32 (2n-1 for n<8, 240 for n=8, and 2n(n-1) for n>8).[3]

Template:CDD + Template:CDD

The DTemplate:Sup sub lattice (also called DTemplate:Sup sub and CTemplate:Sup sub) can be constructed by the union of all four 6-demicubic lattices:[4] It is also the 6-dimensional body centered cubic, the union of two 6-cube honeycombs in dual positions.

Template:CDD + Template:CDD + Template:CDD + Template:CDD = Template:CDD + Template:CDD.

The kissing number of the D6* lattice is 12 (2n for n≥5).[5] and its Voronoi tessellation is a trirectified 6-cubic honeycomb, Template:CDD, containing all birectified 6-orthoplex Voronoi cell, Template:CDD.[6]

Symmetry constructions

There are three uniform construction symmetries of this tessellation. Each symmetry can be represented by arrangements of differened colors on the 64 6-demicube facets around each vertex.

Coxeter group Schläfli symbol Coxeter-Dynkin diagram Vertex figure
Symmetry
Facets/verf
B~6 = [31,1,3,3,3,4]
= [1+,4,3,3,3,3,4]
{31,1,3,3,3,4}
= h{4,3,3,3,3,4}
Template:CDD = Template:CDD Template:CDD
[3,3,3,3,4]
64: 6-demicube
12: 6-orthoplex
D~6 = [31,1,3,31,1]
= [1+,4,3,3,31,1]
{31,1,3,3,31,1} Template:CDD = Template:CDD Template:CDD
[33,1,1]
32+32: 6-demicube
12: 6-orthoplex
C~6 = ([[4,3,3,3,4,2+]]) ht0,5{4,3,3,3,4} Template:CDD 32+16+16: 6-demicube
12: 6-orthoplex

Related honeycombs

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See also

Notes

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External links

  • Template:GlossaryForHyperspace
  • Kaleidoscopes: Selected Writings of H.S.M. Coxeter, edited by F. Arthur Sherk, Peter McMullen, Anthony C. Thompson, Asia Ivic Weiss, Wiley-Interscience Publication, 1995, ISBN 978-0-471-01003-6 [1]
    • (Paper 24) H.S.M. Coxeter, Regular and Semi-Regular Polytopes III, [Math. Zeit. 200 (1988) 3-45]
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  1. http://www.math.rwth-aachen.de/~Gabriele.Nebe/LATTICES/D6.html
  2. Sphere packings, lattices, and groups, by John Horton Conway, Neil James Alexander Sloane, Eiichi Bannai [2]
  3. Conway (1998), p. 119
  4. http://www.math.rwth-aachen.de/~Gabriele.Nebe/LATTICES/Ds6.html
  5. Conway (1998), p. 120
  6. Conway (1998), p. 466