9-cube
This article includes alist of references,related reading,orexternal links,but its sources remain unclear because it lacksinline citations.(September 2017) |
9-cube Enneract | |
---|---|
Orthogonal projection insidePetrie polygon Orange vertices are doubled, yellow have 4, and the green center has 8 | |
Type | Regular9-polytope |
Family | hypercube |
Schläfli symbol | {4,37} |
Coxeter-Dynkin diagram | |
8-faces | 18{4,36} |
7-faces | 144{4,35} |
6-faces | 672{4,34} |
5-faces | 2016{4,33} |
4-faces | 4032{4,3,3} |
Cells | 5376{4,3} |
Faces | 4608{4} |
Edges | 2304 |
Vertices | 512 |
Vertex figure | 8-simplex |
Petrie polygon | octadecagon |
Coxeter group | C9,[37,4] |
Dual | 9-orthoplex |
Properties | convex,Hanner polytope |
Ingeometry,a9-cubeis a nine-dimensionalhypercubewith 512vertices,2304edges,4608squarefaces,5376cubiccells,4032tesseract4-faces,20165-cube5-faces,6726-cube6-faces,1447-cube7-faces,and 188-cube8-faces.
It can be named by itsSchläfli symbol{4,37}, being composed of three8-cubesaround each 7-face. It is also called anenneract,aportmanteauoftesseract(the4-cube) andennefor nine (dimensions) inGreek.It can also be called a regularoctadeca-9-topeoroctadecayotton,as anine-dimensional polytopeconstructed with 18 regularfacets.
It is a part of an infinite family of polytopes, called hypercubes. Thedualof a 9-cube can be called a9-orthoplex,and is a part of the infinite family ofcross-polytopes.
Cartesian coordinates
[edit]Cartesian coordinatesfor the vertices of a 9-cube centered at the origin and edge length 2 are
- (±1,±1,±1,±1,±1,±1,±1,±1,±1)
while the interior of the same consists of all points (x0,x1,x2,x3,x4,x5,x6,x7,x8) with −1 <xi< 1.
Projections
[edit]This 9-cube graph is anorthogonal projection.This orientation shows columns of vertices positioned a vertex-edge-vertex distance from one vertex on the left to one vertex on the right, and edges attaching adjacent columns of vertices. The number of vertices in each column represents rows inPascal's triangle,being 1:9:36:84:126:126:84:36:9:1. |
Images
[edit]B9 | B8 | B7 | |||
---|---|---|---|---|---|
[18] | [16] | [14] | |||
B6 | B5 | ||||
[12] | [10] | ||||
B4 | B3 | B2 | |||
[8] | [6] | [4] | |||
A7 | A5 | A3 | |||
[8] | [6] | [4] |
Derived polytopes
[edit]Applying analternationoperation, deleting alternating vertices of the9-cube,creates anotheruniform polytope,called a9-demicube,(part of an infinite family calleddemihypercubes), which has 188-demicubeand 256 8-simplex facets.
Notes
[edit]References
[edit]- H.S.M. Coxeter:
- Coxeter,Regular Polytopes,(3rd edition, 1973), Dover edition,ISBN0-486-61480-8,p. 296, Table I (iii): Regular Polytopes, three regular polytopes in n-dimensions (n≥5)
- H.S.M. Coxeter,Regular Polytopes,3rd Edition, Dover New York, 1973, p. 296, Table I (iii): Regular Polytopes, three regular polytopes in n-dimensions (n≥5)
- 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,ISBN978-0-471-01003-6[1]
- (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 JohnsonUniform Polytopes,Manuscript (1991)
- N.W. Johnson:The Theory of Uniform Polytopes and Honeycombs,Ph.D. (1966)
- Klitzing, Richard."9D uniform polytopes (polyyotta) o3o3o3o3o3o3o3o4x - enne".
External links
[edit]- Weisstein, Eric W."Hypercube".MathWorld.
- Olshevsky, George."Measure polytope".Glossary for Hyperspace.Archived fromthe originalon 4 February 2007.
- Multi-dimensional Glossary: hypercubeGarrett Jones