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{{Uniform polyteron db|Uniform polyteron stat table|hix}}
In [[Five-dimensional space|five-dimensional]] [[geometry]], a 5-[[simplex]] is a self-dual [[Regular polytope|regular]] [[5-polytope]]. It has 6 [[vertex (geometry)|vertices]], 15 [[Edge (geometry)|edge]]s, 20 triangle [[Face (geometry)|faces]], 15 tetrahedral [[Cell (mathematics)|cells]], and 6 [[pentachoron]] [[Facet (geometry)|facets]]. It has a [[dihedral angle]] of cos<sup>−1</sup>(1/5), or approximately 78.46°.
 
== Alternate names ==
 
It can also be called a '''hexateron''', or '''hexa-5-tope''', as a 6-[[facet (geometry)|facetted]] polytope in 5-dimensions. The [[5-polytope#A note on generality of terms for n-polytopes and elements|name]] ''hexateron'' is derived from ''hexa-'' for having six [[Facet (mathematics)|facets]] and ''[[polyteron|teron]]'' (with ''ter-'' being a corruption of ''[[tetra-]]'') for having four-dimensional facets.
 
By Jonathan Bowers, a hexateron is given the acronym '''hix'''.<ref>Klitzing, (x3o3o3o3o - hix)</ref>
 
== Regular hexateron cartesian coordinates ==
The ''hexateron'' can be constructed from a [[5-cell]] by adding a 6th vertex such that it is equidistant from all the other vertices of the 5-cell.
 
The  [[Cartesian coordinates]] for the vertices of an origin-centered regular hexateron having edge length&nbsp;2 are:
 
:<math>\left(\sqrt{1/15},\ \sqrt{1/10},\ \sqrt{1/6},\ \sqrt{1/3},\ \pm1\right)</math>
:<math>\left(\sqrt{1/15},\ \sqrt{1/10},\ \sqrt{1/6},\ -2\sqrt{1/3},\ 0\right)</math>
:<math>\left(\sqrt{1/15},\ \sqrt{1/10},\ -\sqrt{3/2},\ 0,\ 0\right)</math>
:<math>\left(\sqrt{1/15},\ -2\sqrt{2/5},\ 0,\ 0,\ 0\right)</math>
:<math>\left(-\sqrt{5/3},\ 0,\ 0,\ 0,\ 0\right)</math>
 
The vertices of the ''5-simplex'' can be more simply positioned on a [[hyperplane]] in 6-space as permutations of (0,0,0,0,0,1) ''or'' (0,1,1,1,1,1).  These construction can be seen as facets of the [[hexacross]] or [[rectified 6-cube]] respectively.
 
== Projected images ==
{{5-simplex Coxeter plane graphs|t0|100}}
 
{| class=wikitable width=320
|[[Image:hexateron.png|320px]]<BR>[[Stereographic projection]] 4D to 3D of [[Schlegel diagram]] 5D to 4D of hexateron.
|}
 
== Related uniform 5-polytopes ==
 
It is first in a dimensional series of uniform polytopes and honeycombs, expressed by [[Coxeter]] as 1<sub>3k</sub> series. A degenerate 4-dimensional case exists as 3-sphere tiling, a tetrahedral [[dihedron]].
{{1 3k polytopes}}
 
It is first in a dimensional series of uniform polytopes and honeycombs, expressed by [[Coxeter]] as 3<sub>k1</sub> series. A degenerate 4-dimensional case exists as 3-sphere tiling, a tetrahedral [[hosohedron]].
{{3_k1_polytopes}}
 
The regular 5-simplex is one of 19 [[Uniform_polyteron#The_A5_.5B3.2C3.2C3.2C3.5D_family_.285-simplex.29|uniform polytera]] based on the [3,3,3,3] [[Coxeter group]], all shown here in A<sub>5</sub> [[Coxeter plane]] [[orthographic projection]]s. (Vertices are colored by projection overlap order, red, orange, yellow, green, cyan, blue, purple having progressively more vertices)
 
{{Hexateron family}}
 
== Other forms ==
 
The '''hexateron''' can also be considered a [[Polychoral pyramid|pentachoral pyramid]], constructed as a [[pentachoron]] base in a 4-space [[hyperplane]], and an [[Apex (geometry)|apex]] point ''above'' the hyperplane. The five ''sides'' of the pyramid are made of pentachoral cells.
 
== Notes ==
{{reflist}}
 
== References ==
* [[Thorold Gosset|T. Gosset]]: ''On the Regular and Semi-Regular Figures in Space of n Dimensions'', Messenger of Mathematics, Macmillan, 1900
* [[Harold Scott MacDonald Coxeter|H.S.M. Coxeter]]:
** Coxeter, ''[[Regular Polytopes (book)|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''', editied 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]
*** (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 Horton Conway|John H. Conway]], Heidi Burgiel, Chaim Goodman-Strass, ''The Symmetries of Things'' 2008, ISBN 978-1-56881-220-5 (Chapter 26. pp. 409: Hemicubes: 1<sub>n1</sub>)
* [[Norman Johnson (mathematician)|Norman Johnson]] ''Uniform Polytopes'', Manuscript (1991)
** N.W. Johnson: ''The Theory of Uniform Polytopes and Honeycombs'', Ph.D. (1966)
*{{KlitzingPolytopes|polytera.htm|5D uniform polytopes (polytera)|x3o3o3o3o - hix}}
 
== External links ==
*{{GlossaryForHyperspace | anchor=Simplex | title=Simplex }}
* [http://www.polytope.net/hedrondude/topes.htm Polytopes of Various Dimensions], Jonathan Bowers
* [http://tetraspace.alkaline.org/glossary.htm Multi-dimensional Glossary]
 
{{Polytopes}}
[[Category:5-polytopes]]

Revision as of 08:32, 19 May 2013

Template:Uniform polyteron db In five-dimensional geometry, a 5-simplex is a self-dual regular 5-polytope. It has 6 vertices, 15 edges, 20 triangle faces, 15 tetrahedral cells, and 6 pentachoron facets. It has a dihedral angle of cos−1(1/5), or approximately 78.46°.

Alternate names

It can also be called a hexateron, or hexa-5-tope, as a 6-facetted polytope in 5-dimensions. The name hexateron is derived from hexa- for having six facets and teron (with ter- being a corruption of tetra-) for having four-dimensional facets.

By Jonathan Bowers, a hexateron is given the acronym hix.[1]

Regular hexateron cartesian coordinates

The hexateron can be constructed from a 5-cell by adding a 6th vertex such that it is equidistant from all the other vertices of the 5-cell.

The Cartesian coordinates for the vertices of an origin-centered regular hexateron having edge length 2 are:

The vertices of the 5-simplex can be more simply positioned on a hyperplane in 6-space as permutations of (0,0,0,0,0,1) or (0,1,1,1,1,1). These construction can be seen as facets of the hexacross or rectified 6-cube respectively.

Projected images

Template:5-simplex Coxeter plane graphs


Stereographic projection 4D to 3D of Schlegel diagram 5D to 4D of hexateron.

Related uniform 5-polytopes

It is first in a dimensional series of uniform polytopes and honeycombs, expressed by Coxeter as 13k series. A degenerate 4-dimensional case exists as 3-sphere tiling, a tetrahedral dihedron. 3) On the lane approach area, make sure that you are able to slide nicely and that the shoe opposite the sliding shoe does not slip when you take your steps.
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It is first in a dimensional series of uniform polytopes and honeycombs, expressed by Coxeter as 3k1 series. A degenerate 4-dimensional case exists as 3-sphere tiling, a tetrahedral hosohedron. Tucao this car was bought when two places is not satisfied, a no seat ventilation, a panoramic sunroof no, not France optional.
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The regular 5-simplex is one of 19 uniform polytera based on the [3,3,3,3] Coxeter group, all shown here in A5 Coxeter plane orthographic projections. (Vertices are colored by projection overlap order, red, orange, yellow, green, cyan, blue, purple having progressively more vertices)

Template:Hexateron family

Other forms

The hexateron can also be considered a pentachoral pyramid, constructed as a pentachoron base in a 4-space hyperplane, and an apex point above the hyperplane. The five sides of the pyramid are made of pentachoral cells.

Notes

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References

  • T. Gosset: On the Regular and Semi-Regular Figures in Space of n Dimensions, Messenger of Mathematics, Macmillan, 1900
  • 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, editied 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-Strass, 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)
  • Template:KlitzingPolytopes

External links

Template:Polytopes

  1. Klitzing, (x3o3o3o3o - hix)