Wilhelmy plate

24-cell honeycomb
A 24-cell and first layer of its adjacent 4-faces.
Type	Regular 4-space honeycomb Uniform 4-honeycomb
Schläfli symbol	{3,4,3,3} r{3,3,4,3} 2r{4,3,3,4} 2r{4,3,31,1} {31,1,1,1}
Coxeter-Dynkin diagrams	Template:CDD Template:CDD Template:CDD Template:CDD Template:CDD
4-face type	{3,4,3}
Cell type	{3,4}
Face type	{3}
Edge figure	{3,3}
Vertex figure	{4,3,3}
Dual	{3,3,4,3}
Coxeter groups	${\tilde {F}}_{4}$, [3,4,3,3] ${\tilde {C}}_{4}$, [4,3,3,4] ${\tilde {B}}_{4}$, [4,3,31,1] ${\tilde {D}}_{4}$, [31,1,1,1]
Properties	regular

In four-dimensional Euclidean geometry, the 24-cell honeycomb, or icositetrachoric honeycomb is a regular space-filling tessellation (or honeycomb) of 4-dimensional Euclidean space by regular 24-cells. It can be represented by Schläfli symbol {3,4,3,3}.

The dual tessellation by regular 16-cell honeycomb has Schläfli symbol {3,3,4,3}. Together with the tesseractic honeycomb (or 4-cubic honeycomb) these are the only regular tessellations of Euclidean 4-space.

Kissing number

If a 3-sphere is inscribed in each hypercell of this tessellation, the resulting arrangement is the densest possible regular sphere packing in four dimensions, with the kissing number 24. The packing density of this arrangement is

${\frac {\pi ^{2}}{16}}\cong 0.61685.$

The 24-cell honeycomb can be constructed as the Voronoi tessellation of the D₄ root lattice or F4 lattice. Each 24-cell is then centered at a D₄ lattice point, i.e. one of

$\left\{(x_{i})\in \mathbb {Z} ^{4}:{\textstyle \sum _{i}}x_{i}\equiv 0\;({\mbox{mod }}2)\right\}.$

These points can also be described as Hurwitz quaternions with even square norm.

The vertices of the honeycomb lie at the deep holes of the D₄ lattice. These are the Hurwitz quaternions with odd square norm.

It can be constructed as a birectified tesseractic honeycomb, by taking a tesseractic honeycomb and placing vertices at the centers of all the square faces. The 24-cell facets exist between these vertices as rectified 16-cells. If the coordinates of the tesseractic honeycomb are integers (i,j,k,l), the birectified tesseractic honeycomb vertices can be placed at all permutations of half-unit shifts in two of the four dimensions, thus: (i+½,j+½,k,l), (i+½,j,k+½,l), (i+½,j,k,l+½), (i,j+½,k+½,l), (i,j+½,k,l+½), (i,j,k+½,l+½).

Configuration

Each 24-cell in the 24-cell honeycomb has 24 neighboring 24-cells. With each neighbor it shares exactly one octahedral cell.

It has 24 more neighbors such that with each of these it shares a single vertex.

It has no neighbors with which it shares only an edge or only a face.

The vertex figure of the 24-cell honeycomb is a tesseract (4-dimensional cube). So there are 16 edges, 32 triangles, 24 octahedra, and 8 24-cells meeting at every vertex. The edge figure is a tetrahedron, so there are 4 triangles, 6 octahedra, and 4 24-cells surrounding every edge. Finally, the face figure is a triangle, so there are 3 octahedra and 3 24-cells meeting at every face.

Cross-sections

One way to visualize 4-dimensional figures is to consider various 3-dimensional cross-sections. Applying this technique to the 24-cell honeycomb gives rise to various 3-dimensional honeycombs with varying degrees of regularity.

Vertex-first sections
Rhombic dodecahedral honeycomb	Cubic honeycomb
Cell-first sections
Rectified cubic honeycomb	Bitruncated cubic honeycomb

A vertex-first cross-section is one orthogonal to a line joining opposite vertices of one of the 24-cells. For instance, one could take any of the coordinate hyperplanes in the coordinate system given above (i.e. the planes determined by x_i = 0). The cross-section of {3,4,3,3} by one of these hyperplanes gives a rhombic dodecahedral honeycomb. Each of the rhombic dodecahedra corresponds to a maximal cross-section of one of the 24-cells intersecting the hyperplane (the center of each such 24-cell lies in the hyperplane). Accordingly, the rhombic dodecahedral honeycomb is the Voronoi tessellation of the D₃ root lattice (a face-centered cubic lattice). Shifting this hyperplane halfway to one of the vertices (e.g. x_i = ½) gives rise to a regular cubic honeycomb. In this case the center of each 24-cell lies off the hyperplane. Shifting again, so the hyperplane intersects the vertex, gives another rhombic dodecahedral honeycomb but with new 24-cells (the former ones having shrunk to points). In general, for any integer n, the cross-section through x_i = n is a rhombic dodecahedral honeycomb, and the cross-section through x_i = n + ½ is a cubic honeycomb. As the hyperplane moves through 4-space, the cross-section morphs between the two periodically.

A cell-first cross-section is one parallel to one of the octahedral cells of a 24-cell. Consider, for instance, the hyperplane orthogonal to (1,1,0,0). The cross-section of {3,4,3,3} by this hyperplane is a rectified cubic honeycomb. Each cuboctahedron in this honeycomb is a maximal cross-section of a 24-cell whose center lies in the plane. Meanwhile, each octahedron is a boundary cell of a 24-cell whose center lies off the plane. Shifting this hyperplane till it lies halfway between the center of a 24-cell and the boundary, one obtains a bitruncated cubic honeycomb. The cuboctahedra have shrunk, and the octahedra have grown until they are both truncated octahedra. Shifting again, so the hyperplane intersects the boundary of the central 24-cell gives a rectified cubic honeycomb again, the cuboctahedra and octahedra having swapped positions. As the hyperplane sweeps through 4-space, the cross-section morphs between these two honeycombs periodically.

Symmetry constructions

There are five different symmetry constructions of this tessellation. Each symmetry can be represented by different arrangements of colored 24-cell facets. In all cases, eight 24-cells meet at each vertex, but the vertex figures have different symmetry generators.

Coxeter group	Coxeter diagram	Facets (24-cells)	Vertex figure (8-cell)	Vertex figure symmetry order
${\tilde {F}}_{4}$	Template:CDD	8: Template:CDD	Template:CDD	384
${\tilde {F}}_{4}$	Template:CDD	6: Template:CDD 2: Template:CDD	Template:CDD	96
${\tilde {C}}_{4}$	Template:CDD	4,4: Template:CDD	Template:CDD	64
${\tilde {B}}_{4}$	Template:CDD	2,2: Template:CDD 4: Template:CDD	Template:CDD	32
${\tilde {D}}_{4}$	Template:CDD	2,2,2,2: Template:CDD	Template:CDD	16

Related honeycombs

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See also

Other uniform honeycombs in 4-space:

• Truncated 5-cell honeycomb
• Omnitruncated 5-cell honeycomb
• Truncated 24-cell honeycomb
• Rectified 24-cell honeycomb
• Snub 24-cell honeycomb

References

• Coxeter, H.S.M. Regular Polytopes, (3rd edition, 1973), Dover edition, ISBN 0-486-61480-8 p. 296, Table II: Regular honeycombs
• 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]
• George Olshevsky, Uniform Panoploid Tetracombs, Manuscript (2006) (Complete list of 11 convex uniform tilings, 28 convex uniform honeycombs, and 143 convex uniform tetracombs) - Model 88
• Template:KlitzingPolytopes o4o3x3o4o, o3x3o *b3o4o, o3x3o *b3o4o, o3x3o4o3o, o3o3o4o3x - icot - O88

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