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10-simplex


Regular hendecaxennon(10-simplex)
Orthogonal projectioninside Petrie polygon
TypeRegular 10-polytope
Familysimplex
Schläfli symbol{3,3,3,3,3,3,3,3,3}
Coxeter-Dynkindiagram
9-faces11 9-simplex
8-faces55 8-simplex
7-faces165 7-simplex
6-faces330 6-simplex
5-faces462 5-simplex
4-faces462 5-cell
Cells330 tetrahedron
Faces165 triangle
Edges55
Vertices11
Vertex figure9-simplex
Petrie polygonhendecagon
Coxeter groupA10 [3,3,3,3,3,3,3,3,3]
DualSelf-dual
Propertiesconvex

In geometry, a 10-simplex is a self-dual regular 10-polytope. It has 11 vertices, 55 edges, 165 triangle faces, 330 tetrahedral cells, 462 5-cell 4-faces, 462 5-simplex 5-faces, 330 6-simplex 6-faces, 165 7-simplex 7-faces, 55 8-simplex 8-faces, and 11 9-simplex 9-faces. Its dihedral angle is cos−1(1/10), or approximately 84.26°.

It can also be called a hendecaxennon, or hendeca-10-tope, as an 11-facetted polytope in 10-dimensions. Acronym: ux

The name hendecaxennon is derived from hendeca for 11 facets in Greek and -xenn (variation of ennea for nine), having 9-dimensional facets, and -on.

The Cartesian coordinates of the vertices of an origin-centered regular 10-simplex having edge length 2 are:

(

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{\displaystyle \left({\sqrt {1/55}},\ {\sqrt {1/45}},\ 1/6,\ {\sqrt {1/28}},\ {\sqrt {1/21}},\ {\sqrt {1/15}},\ {\sqrt {1/10}},\ {\sqrt {1/6}},\ {\sqrt {1/3}},\ \pm 1\right)}





  
    
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{\displaystyle \left({\sqrt {1/55}},\ {\sqrt {1/45}},\ 1/6,\ {\sqrt {1/28}},\ {\sqrt {1/21}},\ {\sqrt {1/15}},\ {\sqrt {1/10}},\ {\sqrt {1/6}},\ -2{\sqrt {1/3}},\ 0\right)}





  
    
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{\displaystyle \left({\sqrt {1/55}},\ {\sqrt {1/45}},\ 1/6,\ {\sqrt {1/28}},\ {\sqrt {1/21}},\ {\sqrt {1/15}},\ {\sqrt {1/10}},\ -{\sqrt {3/2}},\ 0,\ 0\right)}





  
    
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{\displaystyle \left({\sqrt {1/55}},\ {\sqrt {1/45}},\ 1/6,\ {\sqrt {1/28}},\ {\sqrt {1/21}},\ {\sqrt {1/15}},\ -2{\sqrt {2/5}},\ 0,\ 0,\ 0\right)}





  
    
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{\displaystyle \left({\sqrt {1/55}},\ {\sqrt {1/45}},\ 1/6,\ {\sqrt {1/28}},\ {\sqrt {1/21}},\ -{\sqrt {5/3}},\ 0,\ 0,\ 0,\ 0\right)}





  
    
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{\displaystyle \left({\sqrt {1/55}},\ {\sqrt {1/45}},\ 1/6,\ {\sqrt {1/28}},\ -{\sqrt {12/7}},\ 0,\ 0,\ 0,\ 0,\ 0\right)}





  
    
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{\displaystyle \left({\sqrt {1/55}},\ {\sqrt {1/45}},\ 1/6,\ -{\sqrt {7/4}},\ 0,\ 0,\ 0,\ 0,\ 0,\ 0\right)}





  
    
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{\displaystyle \left({\sqrt {1/55}},\ {\sqrt {1/45}},\ -4/3,\ 0,\ 0,\ 0,\ 0,\ 0,\ 0,\ 0\right)}





  
    
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{\displaystyle \left({\sqrt {1/55}},\ -3{\sqrt {1/5}},\ 0,\ 0,\ 0,\ 0,\ 0,\ 0,\ 0,\ 0\right)}





  
    
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{\displaystyle \left(-{\sqrt {20/11}},\ 0,\ 0,\ 0,\ 0,\ 0,\ 0,\ 0,\ 0,\ 0\right)}

More simply, the vertices of the 10-simplex can be positioned in 11-space as permutations of (0,0,0,0,0,0,0,0,0,0,1). This construction is based on facets of the 11-orthoplex.

Ak Coxeter planeA10A9A8
[11][10][9]
[8][7][6]
[5][4][3]

The 2-skeleton of the 10-simplex is topologically related to the 11-cell abstract regular polychoron which has the same 11 vertices, 55 edges, but only 1/3 the faces (55).

  • Coxeter, H.S.M.:

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    • Sherk, F. Arthur; McMullen, Peter; Thompson, Anthony C.; Weiss, Asia Ivic, eds. (1995). Kaleidoscopes: Selected Writings of H.S.M. Coxeter. Wiley. ISBN 978-0-471-01003-6.
  • Conway, John H.; Burgiel, Heidi; Goodman-Strauss, Chaim (2008). "26. Hemicubes: 1n1". The Symmetries of Things. p. 409. ISBN 978-1-56881-220-5.

  • Johnson, Norman (1991). Uniform Polytopes (Manuscript).

  • Klitzing, Richard. "10D uniform polytopes (polyxenna)". x3o3o3o3o3o3o3o3o3o – ux

  • Glossary for hyperspace, George Olshevsky.

  • Polytopes of Various Dimensions

  • Multi-dimensional Glossary

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AnBnI2(p) / DnE6 / E7 / E8 / F4 / G2Hn
TriangleSquarep-gonHexagonPentagon
TetrahedronOctahedron • CubeDemicubeDodecahedron • Icosahedron
Pentachoron16-cell • TesseractDemitesseract24-cell120-cell • 600-cell
5-simplex5-orthoplex • 5-cube5-demicube
6-simplex6-orthoplex • 6-cube6-demicube122 • 221
7-simplex7-orthoplex • 7-cube7-demicube132 • 231 • 321
8-simplex8-orthoplex • 8-cube8-demicube142 • 241 • 421
9-simplex9-orthoplex • 9-cube9-demicube
10-simplex10-orthoplex • 10-cube10-demicube
n-simplexn-orthoplex • n-cuben-demicube1k2 • 2k1 • k21n-pentagonal polytope
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