5-simplex honeycomb

This vertex arrangement is called the A₅ latticeor5-simplex lattice. The 30 vertices of the stericated 5-simplex vertex figure represent the 30 roots of the ${\displaystyle {\tilde {A}}_{5}}$  Coxeter group.^[1] It is the 5-dimensional case of a simplectic honeycomb.

The A²
₅ lattice is the union of two A₅ lattices:

        ∪        

The A³
₅ is the union of three A₅ lattices:

        ∪         ∪        .

The A^*
₅ lattice (also called A⁶
₅) is the union of six A₅ lattices, and is the dual vertex arrangement to the omnitruncated 5-simplex honeycomb, and therefore the Voronoi cell of this lattice is an omnitruncated 5-simplex.

        ∪         ∪         ∪         ∪         ∪         = dual of        

This honeycomb is one of 12 unique uniform honeycombs^[2] constructed by the ${\displaystyle {\tilde {A}}_{5}}$  Coxeter group. The extended symmetry of the hexagonal diagram of the ${\displaystyle {\tilde {A}}_{5}}$  Coxeter group allows for automorphisms that map diagram nodes (mirrors) on to each other. So the various 12 honeycombs represent higher symmetries based on the ring arrangement symmetry in the diagrams:

The 5-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:

Regular and uniform honeycombs in 5-space:

• 5-cubic honeycomb
• 5-demicube honeycomb
• Truncated 5-simplex honeycomb
• Omnitruncated 5-simplex honeycomb

• 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]
  • (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]