Truncated 5-cell honeycomb: Difference between revisions

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{| class="wikitable" align="right" style="margin-left:10px" width="320"
!bgcolor=#e7dcc3 colspan=2|6-simplex honeycomb
|-
|bgcolor=#ffffff align=center colspan=2|(No image)
|-
|bgcolor=#e7dcc3|Type||[[Uniform_7-polytope#Regular_and_uniform_honeycombs|Uniform honeycomb]]
|-
|bgcolor=#e7dcc3|Family||[[Simplectic honeycomb]]
|-
|bgcolor=#e7dcc3|[[Schläfli symbol]]||{3<sup>[7]</sup>}
|-
|bgcolor=#e7dcc3|[[Coxeter–Dynkin diagram]]s||{{CDD|node_1|split1|nodes|3ab|nodes|3ab|branch}}
|-
|bgcolor=#e7dcc3|6-face types||[[6-simplex|{3<sup>5</sub>}]] [[File:6-simplex t0.svg|30px]], [[rectified 6-simplex|t<sub>1</sub>{3<sup>5</sub>}]] [[File:6-simplex t1.svg|30px]]<BR>[[birectified 6-simplex|t<sub>2</sub>{3<sup>5</sub>}]] [[File:6-simplex t2.svg|30px]]
|-
|bgcolor=#e7dcc3|5-face types||[[5-simplex|{3<sup>4</sub>}]] [[File:5-simplex t0.svg|30px]], [[rectified 5-simplex|t<sub>1</sub>{3<sup>4</sub>}]] [[File:5-simplex t1.svg|30px]]<BR>[[birectified 5-simplex|t<sub>2</sub>{3<sup>4</sub>}]] [[File:5-simplex t2.svg|30px]]
|-
|bgcolor=#e7dcc3|4-face types||[[5-cell|{3<sup>3</sub>}]] [[File:4-simplex t0.svg|30px]], [[Rectified 5-cell|t<sub>1</sub>{3<sup>3</sub>}]] [[File:4-simplex t1.svg|30px]]
|-
|bgcolor=#e7dcc3|Cell types||[[tetrahedron|{3,3}]] [[File:3-simplex t0.svg|30px]], [[Octahedron|t<sub>1</sub>{3,3}]] [[File:3-simplex t1.svg|30px]]
|-
|bgcolor=#e7dcc3|Face types||[[triangle|{3}]] [[File:2-simplex t0.svg|30px]]
|-
|bgcolor=#e7dcc3|Vertex figure||[[Pentellated 6-simplex|t<sub>0,5</sub>{3<sup>5</sup>}]] [[File:6-simplex t05.svg|30px]]
|-
|bgcolor=#e7dcc3|[[Coxeter notation|Symmetry]]||<math>{\tilde{A}}_6</math>×2, [<span/>[3<sup>[7]</sup>]]
|-
|bgcolor=#e7dcc3|Properties||[[vertex-transitive]]
|}
In [[Sixth dimension|six-dimensional]] [[Euclidean geometry]], the '''6-simplex honeycomb''' is a space-filling [[tessellation]] (or [[honeycomb (geometry)|honeycomb]]). The tessellation fills space by [[6-simplex]], [[rectified 6-simplex]], and [[birectified 6-simplex]] facets. These facet types occur in proportions of 1:1:1 respectively in the whole honeycomb.


== A6 lattice ==
This [[vertex arrangement]] is called the A6 lattice or '''6-simplex lattice'''. The 42 vertices of the [[expanded 6-simplex]] vertex figure represent the 42 roots of the <math>{\tilde{A}}_6</math> [[Coxeter group]].<ref>http://www2.research.att.com/~njas/lattices/A6.html</ref>  It is the 6-dimensional case of a [[simplectic honeycomb]]. Around each vertex figure are 126 facets: 7+7 [[6-simplex]], 21+21 [[rectified 6-simplex]], 35+35 [[birectified 6-simplex]], with the count distribution from the 8th row of [[Pascal's triangle]].


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The A{{sup sub|*|6}} lattice (also called A{{sup sub|7|6}}) is the union of seven A<sub>6</sub> lattices, and has the [[vertex arrangement]] of the dual to the [[omnitruncated 6-simplex honeycomb]], and therefore the [[Voronoi cell]] of this lattice is the [[omnitruncated 6-simplex]].
:
{{CDD|node_1|split1|nodes|3ab|nodes|3ab|branch}} +
{{CDD|node|split1|nodes_10lr|3ab|nodes|3ab|branch}} +
{{CDD|node|split1|nodes_01lr|3ab|nodes|3ab|branch}} +
{{CDD|node|split1|nodes|3ab|nodes_10lr|3ab|branch}} +
{{CDD|node|split1|nodes|3ab|nodes_01lr|3ab|branch}} +
{{CDD|node|split1|nodes|3ab|nodes|3ab|branch_10l}} +
{{CDD|node|split1|nodes|3ab|nodes|3ab|branch_01l}} = dual of {{CDD|node_1|split1|nodes_11|3ab|nodes_11|3ab|branch_11}}
 
== Related polytopes and honeycombs ==
 
{{6-simplex honeycomb family}}
 
== Projection by folding ==
 
The ''6-simplex honeycomb'' can be projected into the 3-dimensional [[cubic honeycomb]] by a [[Coxeter–Dynkin diagram#Geometric folding|geometric folding]] operation that maps two pairs of mirrors into each other, sharing the same [[vertex arrangement]]:
 
{|class=wikitable
|-
!<math>{\tilde{A}}_6</math>
|{{CDD|node_1|split1|nodes|3ab|nodes|3ab|branch}}
|-
!<math>{\tilde{C}}_3</math>
|{{CDD|node_1|4|node|3|node|4|node}}
|}
 
==See also==
Regular and uniform honeycombs in 6-space:
*[[6-cubic honeycomb]]
*[[6-demicubic honeycomb]]
*[[Truncated 6-simplex honeycomb]]
*[[Omnitruncated 6-simplex honeycomb]]
*[[2_22 honeycomb|2<sub>22</sub> honeycomb]]
 
==Notes==
{{reflist}}
 
== References ==
* [[Norman Johnson (mathematician)|Norman Johnson]] ''Uniform Polytopes'', Manuscript (1991)
* '''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 [http://www.wiley.com/WileyCDA/WileyTitle/productCd-0471010030.html]
** (Paper 22) H.S.M. Coxeter, ''Regular and Semi Regular Polytopes I'', [Math. Zeit. 46 (1940) 380-407, MR 2,10] (1.9 Uniform space-fillings)
** (Paper 24) H.S.M. Coxeter, ''Regular and Semi-Regular Polytopes III'', [Math. Zeit. 200 (1988) 3-45]
{{Honeycombs}}
 
[[Category:Honeycombs (geometry)]]
[[Category:7-polytopes]]

Latest revision as of 09:31, 23 October 2013

6-simplex honeycomb
(No image)
Type Uniform honeycomb
Family Simplectic honeycomb
Schläfli symbol {3[7]}
Coxeter–Dynkin diagrams Template:CDD
6-face types {35} , t1{35}
t2{35}
5-face types {34} , t1{34}
t2{34}
4-face types {33} , t1{33}
Cell types {3,3} , t1{3,3}
Face types {3}
Vertex figure t0,5{35}
Symmetry A~6×2, [[3[7]]]
Properties vertex-transitive

In six-dimensional Euclidean geometry, the 6-simplex honeycomb is a space-filling tessellation (or honeycomb). The tessellation fills space by 6-simplex, rectified 6-simplex, and birectified 6-simplex facets. These facet types occur in proportions of 1:1:1 respectively in the whole honeycomb.

A6 lattice

This vertex arrangement is called the A6 lattice or 6-simplex lattice. The 42 vertices of the expanded 6-simplex vertex figure represent the 42 roots of the A~6 Coxeter group.[1] It is the 6-dimensional case of a simplectic honeycomb. Around each vertex figure are 126 facets: 7+7 6-simplex, 21+21 rectified 6-simplex, 35+35 birectified 6-simplex, with the count distribution from the 8th row of Pascal's triangle.

The ATemplate:Sup sub lattice (also called ATemplate:Sup sub) is the union of seven A6 lattices, and has the vertex arrangement of the dual to the omnitruncated 6-simplex honeycomb, and therefore the Voronoi cell of this lattice is the omnitruncated 6-simplex.

Template:CDD + Template:CDD + Template:CDD + Template:CDD + Template:CDD + Template:CDD + Template:CDD = dual of Template:CDD

Related polytopes and honeycombs

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Projection by folding

The 6-simplex honeycomb can be projected into the 3-dimensional cubic honeycomb by a geometric folding operation that maps two pairs of mirrors into each other, sharing the same vertex arrangement:

A~6 Template:CDD
C~3 Template:CDD

See also

Regular and uniform honeycombs in 6-space:

Notes

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References

  • Norman Johnson Uniform Polytopes, Manuscript (1991)
  • 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]
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    • (Paper 24) H.S.M. Coxeter, Regular and Semi-Regular Polytopes III, [Math. Zeit. 200 (1988) 3-45]

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