In seven-dimensional geometry, a rectified 7-simplex is a convex uniform 7-polytope, being a rectification of the regular 7-simplex.

More information Orthogonal projections in A7 Coxeter plane ...

7-simplex	Rectified 7-simplex
Birectified 7-simplex	Trirectified 7-simplex
Orthogonal projections in A7 Coxeter plane

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There are four unique degrees of rectifications, including the zeroth, the 7-simplex itself. Vertices of the rectified 7-simplex are located at the edge-centers of the 7-simplex. Vertices of the birectified 7-simplex are located in the triangular face centers of the 7-simplex. Vertices of the trirectified 7-simplex are located in the tetrahedral cell centers of the 7-simplex.

Rectified 7-simplex
Type	uniform 7-polytope
Coxeter symbol	051
Schläfli symbol	r{36} = {35,1} or ${\displaystyle \left\{{\begin{array}{l}3,3,3,3,3\\3\end{array}}\right\}}$
Coxeter diagrams	Or
6-faces	16
5-faces	84
4-faces	224
Cells	350
Faces	336
Edges	168
Vertices	28
Vertex figure	6-simplex prism
Petrie polygon	Octagon
Coxeter group	A7, [36], order 40320
Properties	convex

The rectified 7-simplex is the edge figure of the 2₅₁ honeycomb. It is called 0_5,1 for its branching Coxeter-Dynkin diagram, shown as .

E. L. Elte identified it in 1912 as a semiregular polytope, labeling it as S¹
₇.

Images

More information Ak Coxeter plane, A7 ...

orthographic projections

Ak Coxeter plane	A7	A6	A5
Graph
Dihedral symmetry	[8]	[7]	[6]
Ak Coxeter plane	A4	A3	A2
Graph
Dihedral symmetry	[5]	[4]	[3]

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Birectified 7-simplex
Type	uniform 7-polytope
Coxeter symbol	042
Schläfli symbol	2r{3,3,3,3,3,3} = {34,2} or ${\displaystyle \left\{{\begin{array}{l}3,3,3,3\\3,3\end{array}}\right\}}$
Coxeter diagrams	Or
6-faces	16: 8 r{35} 8 2r{35}
5-faces	112: 28 {34} 56 r{34} 28 2r{34}
4-faces	392: 168 {33} (56+168) r{33}
Cells	770: (420+70) {3,3} 280 {3,4}
Faces	840: (280+560) {3}
Edges	420
Vertices	56
Vertex figure	{3}x{3,3,3}
Coxeter group	A7, [36], order 40320
Properties	convex

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E. L. Elte identified it in 1912 as a semiregular polytope, labeling it as S²
₇. It is also called 0_4,2 for its branching Coxeter-Dynkin diagram, shown as .

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Trirectified 7-simplex
Type	uniform 7-polytope
Coxeter symbol	033
Schläfli symbol	3r{36} = {33,3} or ${\displaystyle \left\{{\begin{array}{l}3,3,3\\3,3,3\end{array}}\right\}}$
Coxeter diagrams	Or
6-faces	16 2r{35}
5-faces	112
4-faces	448
Cells	980
Faces	1120
Edges	560
Vertices	70
Vertex figure	{3,3}x{3,3}
Coxeter group	A7×2, [[36]], order 80640
Properties	convex, isotopic

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The trirectified 7-simplex is the intersection of two regular 7-simplexes in dual configuration.

E. L. Elte identified it in 1912 as a semiregular polytope, labeling it as S³
₇.

This polytope is the vertex figure of the 1₃₃ honeycomb. It is called 0_3,3 for its branching Coxeter-Dynkin diagram, shown as .

Related polytopes

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Isotopic uniform truncated simplices

Dim.	2	3	4	5	6	7	8
Name Coxeter	Hexagon = t{3} = {6}	Octahedron = r{3,3} = {31,1} = {3,4} ${\displaystyle \left\{{\begin{array}{l}3\\3\end{array}}\right\}}$	Decachoron 2t{33}	Dodecateron 2r{34} = {32,2} ${\displaystyle \left\{{\begin{array}{l}3,3\\3,3\end{array}}\right\}}$	Tetradecapeton 3t{35}	Hexadecaexon 3r{36} = {33,3} ${\displaystyle \left\{{\begin{array}{l}3,3,3\\3,3,3\end{array}}\right\}}$	Octadecazetton 4t{37}
Images
Vertex figure	( )∨( )	{ }×{ }	{ }∨{ }	{3}×{3}	{3}∨{3}	{3,3}×{3,3}	{3,3}∨{3,3}
Facets		{3}	t{3,3}	r{3,3,3}	2t{3,3,3,3}	2r{3,3,3,3,3}	3t{3,3,3,3,3,3}
As intersecting dual simplexes	∩	∩	∩	∩	∩	∩	∩

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These polytopes are three of 71 uniform 7-polytopes with A₇ symmetry.

• List of A7 polytopes

• 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)". o3o3x3o3o3o3o - broc, o3x3o3o3o3o3o - roc, o3o3x3o3o3o3o - he

• Polytopes of Various Dimensions
• Multi-dimensional Glossary