6-cube

6-cube Hexeract
Orthogonal projection inside Petrie polygon Orange vertices are doubled, and the center yellow has 4 vertices
Type	Regular 6-polytope
Family	hypercube
Schläfli symbol	{4,34}
Coxeter diagram
5-faces	12 {4,3,3,3}
4-faces	60 {4,3,3}
Cells	160 {4,3}
Faces	240 {4}
Edges	192
Vertices	64
Vertex figure	5-simplex
Petrie polygon	dodecagon
Coxeter group	B6, [34,4]
Dual	6-orthoplex
Properties	convex

In geometry, a 6-cube is a six-dimensional hypercube with 64 vertices, 192 edges, 240 square faces, 160 cubic cells, 60 tesseract 4-faces, and 12 5-cube 5-faces.

It has Schläfli symbol {4,3⁴}, being composed of 3 5-cubes around each 4-face. It can be called a hexeract, a portmanteau of tesseract (the 4-cube) with hex for six (dimensions) in Greek. It can also be called a regular dodeca-6-tope or dodecapeton, being a 6-dimensional polytope constructed from 12 regular facets.

Related polytopes

It is a part of an infinite family of polytopes, called hypercubes. The dual of a 6-cube can be called a 6-orthoplex, and is a part of the infinite family of cross-polytopes.

Applying an alternation operation, deleting alternating vertices of the 6-cube, creates another uniform polytope, called a 6-demicube, (part of an infinite family called demihypercubes), which has 12 5-demicube and 32 5-simplex facets.

As a configuration

The elements of the regular polytopes can be expressed in a configuration matrix. Rows and columns reference vertices, edges, faces, and cells, with diagonal element their counts (f-vectors). The nondiagonal elements represent the number of row elements are incident to the column element. The configurations for dual polytopes can be seen by rotating the matrix elements by 180 degrees.

${\begin{bmatrix}{\begin{matrix}64&6&15&20&15&6\\2&192&5&10&10&5\\4&4&240&4&6&4\\8&12&6&160&3&3\\16&32&24&8&60&2\\32&80&80&40&10&12\end{matrix}}\end{bmatrix}}$

Cartesian coordinates

Cartesian coordinates for the vertices of a 6-cube centered at the origin and edge length 2 are

(±1,±1,±1,±1,±1,±1)

while the interior of the same consists of all points (x₀, x₁, x₂, x₃, x₄, x₅) with −1 < x_i < 1.

Construction

There are three Coxeter groups associated with the 6-cube, one regular, with the C₆ or [4,3,3,3,3] Coxeter group, and a half symmetry (D₆) or [3^3,1,1] Coxeter group. The lowest symmetry construction is based on hyperrectangles or proprisms, cartesian products of lower dimensional hypercubes.

Name	Coxeter	Schläfli	Symmetry	Order
Regular 6-cube		{4,3,3,3,3}	[4,3,3,3,3]	46080
Quasiregular 6-cube			[3,3,3,31,1]	23040
hyperrectangle		{4,3,3,3}×{}	[4,3,3,3,2]	7680
		{4,3,3}×{4}	[4,3,3,2,4]	3072
		{4,3}2	[4,3,2,4,3]	2304
		{4,3,3}×{}2	[4,3,3,2,2]	1536
		{4,3}×{4}×{}	[4,3,2,4,2]	768
		{4}3	[4,2,4,2,4]	512
		{4,3}×{}3	[4,3,2,2,2]	384
		{4}2×{}2	[4,2,4,2,2]	256
		{4}×{}4	[4,2,2,2,2]	128
		{}6	[2,2,2,2,2]	64

Images

orthographic projections

Coxeter plane	B6	B5	B4
Graph
Dihedral symmetry	[12]	[10]	[8]
Coxeter plane	Other	B3	B2
Graph
Dihedral symmetry	[2]	[6]	[4]
Coxeter plane		A5	A3
Graph
Dihedral symmetry		[6]	[4]

3D Projections
6-cube 6D simple rotation through 2Pi with 6D perspective projection to 3D.	6-cube quasicrystal structure orthographically projected to 3D using the golden ratio.

Related polytopes

This polytope is one of 63 Uniform 6-polytopes generated from the B₆ Coxeter plane, including the regular 6-cube or 6-orthoplex.

References

• Coxeter, H.S.M. Regular Polytopes, (3rd edition, 1973), Dover edition, ISBN 0-486-61480-8 p. 296, Table I (iii): Regular Polytopes, three regular polytopes in n-dimensions (n>=5)
• Klitzing, Richard. "6D uniform polytopes (polypeta) o3o3o3o3o4x - ax".

External links

• Weisstein, Eric W. "Hypercube". MathWorld.
• Olshevsky, George. "Measure polytope". Glossary for Hyperspace. Archived from the original on 4 February 2007.
• Multi-dimensional Glossary: hypercube Garrett Jones