Английская Википедия:Compound of 5-cube and 5-orthoplex

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Шаблон:Short description

5-cube 5-orthoplex compound
Type Compound
Schläfli symbol {4,3,3,3} ∪ {3,3,3,4}
Coxeter diagram Шаблон:CDDШаблон:CDD
Intersection Birectified 5-cube
Convex hull dual of rectified 5-orthoplex
5-polytopes 2:
1 5-cube
1 5-orthoplex
Polychora 42:
10 tesseract
32 16-cell
Polyhedra 120:
40 cubes
80 tetrahedra
Faces 160:
80 squares
80 triangles
Edges 120 (80+40)
Vertices 42 (32+10)
Symmetry group B5, [4,3,3,3], order 3840

In 5-dimensional geometry, the 5-cube 5-orthoplex compound[1] is a polytope compound composed of a regular 5-cube and dual regular 5-orthoplex.[2] A compound polytope is a figure that is composed of several polytopes sharing a common center. The outer vertices of a compound can be connected to form a convex polytope called the convex hull. The compound is a facetting of the convex hull.

In 5-polytope compounds constructed as dual pairs, the hypercells and vertices swap positions and cells and edges swap positions. Because of this the number of hypercells and vertices are equal, as are cells and edges. Mid-edges of the 5-cube cross mid-cell in the 16-cell, and vice versa.

It can be seen as the 5-dimensional analogue of a compound of cube and octahedron.

Construction

The 42 Cartesian coordinates of the vertices of the compound are.

10: (±2, 0, 0, 0, 0), (0, ±2, 0, 0, 0), (0, 0, ±2, 0, 0), (0, 0, 0, ±2, 0), (0, 0, 0, 0, ±2)
32: (±1, ±1, ±1, ±1, ±1)

The convex hull of the vertices makes the dual of rectified 5-orthoplex.

The intersection of the 5-cube and 5-orthoplex compound is the uniform birectified 5-cube: Шаблон:CDD = Шаблон:CDDШаблон:CDD.

Images

The compound can be seen in projection as the union of the two polytope graphs. The convex hull as the dual of the rectified 5-orthoplex will have the same vertices, but different edges.

Polytopes in B5 Coxeter plane
Файл:5-cube t0.svg
5-cube
Файл:5-cube t4.svg
5-orthoplex
Файл:Cubeorthoplex-5 B5.svg
Compound
Файл:5-cube t2.svg
Birectified 5-orthoplex
(Intersection)
Шаблон:CDD Шаблон:CDD Шаблон:CDDШаблон:CDD Шаблон:CDD

See also

References

Шаблон:Reflist

External links