 5-demicube    
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 5-orthoplex  
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In 5-dimensional geometry, there are 23 uniform polytopes with D5 symmetry, 8 are unique, and 15 are shared with the B5 symmetry. There are two special forms, the 5-orthoplex, and 5-demicube with 10 and 16 vertices respectively.
They can be visualized as symmetric orthographic projections in Coxeter planes of the D6 Coxeter group, and other subgroups.
Graphs edit
Symmetric orthographic projections of these 8 polytopes can be made in the D5, D4, D3, A3, Coxeter planes. Ak has [k+1] symmetry, Dk has [2(k-1)] symmetry. The B5 plane is included, with only half the [10] symmetry displayed.
These 8 polytopes are each shown in these 5 symmetry planes, with vertices and edges drawn, and vertices colored by the number of overlapping vertices in each projective position.
| # | Coxeter plane projections | Coxeter-Dynkin diagram Schläfli symbol symbols Johnson and Bowers names | ||||
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| [10/2] | [8] | [6] | [4] | [4] | ||
| B5 | D5 | D4 | D3 | A3 | ||
| 1 | 
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(121) 5-demicube Hemipenteract (hin) |
| 2 | 
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t0,1(121) Truncated 5-demicube Truncated hemipenteract (thin) |
| 3 | 
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t0,2(121) Cantellated 5-demicube Small rhombated hemipenteract (sirhin) |
| 4 | 
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t0,3(121) Runcinated 5-demicube Small prismated hemipenteract (siphin) |
| 5 | 
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t0,1,2(121) Cantitruncated 5-demicube Great rhombated hemipenteract (girhin) |
| 6 | 
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t0,1,3(121) Runcitruncated 5-demicube Prismatotruncated hemipenteract (pithin) |
| 7 | 
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t0,2,3(121) Runcicantellated 5-demicube Prismatorhombated hemipenteract (pirhin) |
| 8 | 
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t0,1,2,3(121) Runcicantitruncated 5-demicube Great prismated hemipenteract (giphin) |
References edit
- 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 [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]
- N.W. Johnson: The Theory of Uniform Polytopes and Honeycombs, Ph.D. Dissertation, University of Toronto, 1966
- Klitzing, Richard. "5D uniform polytopes (polytera)".