| Demidekeract (10-demicube) | ||
|---|---|---|
 Petrie polygon projection | ||
| Type | Uniform 10-polytope | |
| Family | demihypercube | |
| Coxeter symbol | 171 | |
| Schläfli symbol | {31,7,1} h{4,38} s{21,1,1,1,1,1,1,1,1} | |
| Coxeter diagram |     =    
| |
| 9-faces | 532 | 20 {31,6,1}  512 {38} 
|
| 8-faces | 5300 | 180 {31,5,1}  5120 {37} 
|
| 7-faces | 24000 | 960 {31,4,1}  23040 {36} 
|
| 6-faces | 64800 | 3360 {31,3,1}  61440 {35} 
|
| 5-faces | 115584 | 8064 {31,2,1}  107520 {34} 
|
| 4-faces | 142464 | 13440 {31,1,1}  129024 {33} 
|
| Cells | 122880 | 15360 {31,0,1}  107520 {3,3}
|
| Faces | 61440 | {3} 
|
| Edges | 11520 | |
| Vertices | 512 | |
| Vertex figure | Rectified 9-simplex
| |
| Symmetry group | D10, [37,1,1] = [1+,4,38] [29]+ | |
| Dual | ? | |
| Properties | convex | |
In geometry, a 10-demicube or demidekeract is a uniform 10-polytope, constructed from the 10-cube with alternated vertices removed. It is part of a dimensionally infinite family of uniform polytopes called demihypercubes.
E. L. Elte identified it in 1912 as a semiregular polytope, labeling it as HM10 for a ten-dimensional half measure polytope.
Coxeter named this polytope as 171 from its Coxeter diagram, with a ring on one of the 1-length branches, 
and Schläfli symbol or {3,37,1}.
Cartesian coordinates
editCartesian coordinates for the vertices of a demidekeract centered at the origin are alternate halves of the dekeract:
- (±1,±1,±1,±1,±1,±1,±1,±1,±1,±1)
with an odd number of plus signs.
Images
edit B10 coxeter plane |
 D10 coxeter plane (Vertices are colored by multiplicity: red, orange, yellow, green = 1,2,4,8) |
Related polytopes
editA regular dodecahedron can be embedded as a regular skew polyhedron within the vertices in the 10-demicube, possessing the same symmetries as the 3-dimensional dodecahedron.[1]
References
edit- ^ Deza, Michael; Shtogrin, Mikhael (1998). "Embedding the graphs of regular tilings and star-honeycombs into the graphs of hypercubes and cubic lattices". Advanced Studies in Pure Mathematics. Arrangements – Tokyo 1998: 77. doi:10.2969/aspm/02710073. ISBN 978-4-931469-77-8. Retrieved 4 April 2020.
- H.S.M. Coxeter:
- Coxeter, Regular Polytopes, (3rd edition, 1973), Dover edition, ISBN 0-486-61480-8, 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, ISBN 978-0-471-01003-6 [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]
- John H. Conway, Heidi Burgiel, Chaim Goodman-Strauss, The Symmetries of Things 2008, ISBN 978-1-56881-220-5 (Chapter 26. pp. 409: Hemicubes: 1n1)
- Norman Johnson Uniform Polytopes, Manuscript (1991)
- N.W. Johnson: The Theory of Uniform Polytopes and Honeycombs, Ph.D. (1966)
- Klitzing, Richard. "10D uniform polytopes (polyxenna) x3o3o *b3o3o3o3o3o3o3o - hede".
External links
edit- Olshevsky, George. "Demienneract". Glossary for Hyperspace. Archived from the original on 4 February 2007.
- Multi-dimensional Glossary