Runcic 7-cubes

In seven-dimensional geometry, a runcic 7-cube is a convex uniform 7-polytope, related to the uniform 7-demicube. There are 2 unique forms.


7-demicube


Runcic 7-cube


Runcicantic 7-cube

Orthogonal projections in D7 Coxeter plane

Runcic 7-cube

Runcic 7-cube
Typeuniform 7-polytope
Schläfli symbolt0,2{3,34,1}
h3{4,35}
Coxeter-Dynkin diagram
5-faces
4-faces
Cells
Faces
Edges16800
Vertices2240
Vertex figure
Coxeter groupsD7, [34,1,1]
Propertiesconvex

A runcic 7-cube, h3{4,35}, has half the vertices of a runcinated 7-cube, t0,3{4,35}.

Alternate names

  • Small rhombated hemihepteract (Acronym sirhesa) (Jonathan Bowers)[1]

Cartesian coordinates

The Cartesian coordinates for the vertices of a cantellated demihepteract centered at the origin are coordinate permutations:

(±1,±1,±1,±3,±3,±3,±3)

with an odd number of plus signs.

Images

orthographic projections
Coxeter
plane
B7 D7 D6
Graph
Dihedral
symmetry
[14/2] [12] [10]
Coxeter plane D5 D4 D3
Graph
Dihedral
symmetry
[8] [6] [4]
Coxeter
plane
A5 A3
Graph
Dihedral
symmetry
[6] [4]

Runcicantic 7-cube

Runcicantic 7-cube
Typeuniform 7-polytope
Schläfli symbolt0,1,2{3,34,1}
h2,3{4,35}
Coxeter-Dynkin diagram
5-faces
4-faces
Cells
Faces
Edges23520
Vertices6720
Vertex figure
Coxeter groupsD6, [33,1,1]
Propertiesconvex

A runcicantic 7-cube, h2,3{4,35}, has half the vertices of a runcicantellated 7-cube, t0,1,3{4,35}.

Alternate names

  • Great rhombated hemihepteract (Acronym girhesa) (Jonathan Bowers)[2]

Cartesian coordinates

The Cartesian coordinates for the vertices of a runcicantic 7-cube centered at the origin are coordinate permutations:

(±1,±1,±1,±1,±3,±5,±5)

with an odd number of plus signs.

Images

orthographic projections
Coxeter
plane
B7 D7 D6
Graph
Dihedral
symmetry
[14/2] [12] [10]
Coxeter plane D5 D4 D3
Graph
Dihedral
symmetry
[8] [6] [4]
Coxeter
plane
A5 A3
Graph
Dihedral
symmetry
[6] [4]

This polytope is based on the 7-demicube, a part of a dimensional family of uniform polytopes called demihypercubes for being alternation of the hypercube family.

There are 95 uniform polytopes with D7 symmetry, 63 are shared by the BC6 symmetry, and 32 are unique:

D7 polytopes

t0(141)

t0,1(141)

t0,2(141)

t0,3(141)

t0,4(141)

t0,5(141)

t0,1,2(141)

t0,1,3(141)

t0,1,4(141)

t0,1,5(141)

t0,2,3(141)

t0,2,4(141)

t0,2,5(141)

t0,3,4(141)

t0,3,5(141)

t0,4,5(141)

t0,1,2,3(141)

t0,1,2,4(141)

t0,1,2,5(141)

t0,1,3,4(141)

t0,1,3,5(141)

t0,1,4,5(141)

t0,2,3,4(141)

t0,2,3,5(141)

t0,2,4,5(141)

t0,3,4,5(141)

t0,1,2,3,4(141)

t0,1,2,3,5(141)

t0,1,2,4,5(141)

t0,1,3,4,5(141)

t0,2,3,4,5(141)

t0,1,2,3,4,5(141)

Notes

  1. Klitzing, (x3o3o *b3x3o3o3o - sirhesa)
  2. Klitzing, (x3x3o *b3x3o3o3o - girhesa)

References

  • H.S.M. Coxeter:
    • H.S.M. Coxeter, Regular Polytopes, 3rd Edition, Dover New York, 1973
    • 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
      • (Paper 22) H.S.M. Coxeter, Regular and Semi Regular Polytopes I, [Math. Zeit. 46 (1940) 380-407, MR 2,10]
      • (Paper 23) H.S.M. Coxeter, Regular and Semi-Regular Polytopes II, [Math. Zeit. 188 (1985) 559-591]
      • (Paper 24) H.S.M. Coxeter, Regular and Semi-Regular Polytopes III, [Math. Zeit. 200 (1988) 3-45]
  • Norman Johnson Uniform Polytopes, Manuscript (1991)
    • N.W. Johnson: The Theory of Uniform Polytopes and Honeycombs, Ph.D.
  • Klitzing, Richard. "7D uniform polytopes (polyexa)". x3o3o *b3x3o3o3o - sirhesa, x3x3o *b3x3o3o3o - girhesa
Family An Bn I2(p) / Dn E6 / E7 / E8 / F4 / G2 Hn
Regular polygon Triangle Square p-gon Hexagon Pentagon
Uniform polyhedron Tetrahedron OctahedronCube Demicube DodecahedronIcosahedron
Uniform polychoron Pentachoron 16-cellTesseract Demitesseract 24-cell 120-cell600-cell
Uniform 5-polytope 5-simplex 5-orthoplex5-cube 5-demicube
Uniform 6-polytope 6-simplex 6-orthoplex6-cube 6-demicube 122221
Uniform 7-polytope 7-simplex 7-orthoplex7-cube 7-demicube 132231321
Uniform 8-polytope 8-simplex 8-orthoplex8-cube 8-demicube 142241421
Uniform 9-polytope 9-simplex 9-orthoplex9-cube 9-demicube
Uniform 10-polytope 10-simplex 10-orthoplex10-cube 10-demicube
Uniform n-polytope n-simplex n-orthoplexn-cube n-demicube 1k22k1k21 n-pentagonal polytope
Topics: Polytope familiesRegular polytopeList of regular polytopes and compounds
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