Bitruncated tesseractic honeycomb

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Bitruncated tesseractic honeycomb
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Type	Uniform 4-honeycomb
Schläfli symbol	t1,2{4,3,3,4} or 2t{4,3,3,4} t1,2{4,31,1} or 2t{4,31,1}t2,3{4,31,1}q2{4,3,3,3,4}
Coxeter-Dynkin diagram	=
4-face type	Bitruncated tesseract Truncated 16-cell
Cell type	Octahedron Truncated tetrahedron Truncated octahedron
Face type	{3}, {4}, {6}
Vertex figure	Square-pyramidal pyramid
Coxeter group	C ~ 4 {\displaystyle {\tilde {C}}_{4}} = [4,3,3,4] B ~ 4 {\displaystyle {\tilde {B}}_{4}} = [4,31,1] D ~ 4 {\displaystyle {\tilde {D}}_{4}} = [31,1,1,1]
Dual
Properties	vertex-transitive

In four-dimensional Euclidean geometry, the bitruncated tesseractic honeycomb is a uniform space-filling tessellation (or honeycomb) in Euclidean 4-space. It is constructed by a bitruncation of a tesseractic honeycomb. It is also called a cantic quarter tesseractic honeycomb from its q2{4,3,3,4} construction.

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Other names

Bitruncated tesseractic tetracomb (batitit)

The [4,3,3,4], , Coxeter group generates 31 permutations of uniform tessellations, 21 with distinct symmetry and 20 with distinct geometry. The expanded tesseractic honeycomb (also known as the stericated tesseractic honeycomb) is geometrically identical to the tesseractic honeycomb. Three of the symmetric honeycombs are shared in the [3,4,3,3] family. Two alternations (13) and (17), and the quarter tesseractic (2) are repeated in other families.

C4 honeycombs
Extendedsymmetry	Extendeddiagram	Order	Honeycombs
[4,3,3,4]:		×1	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
[[4,3,3,4]]		×2	(1), (2), (13), 18 (6), 19, 20
[(3,3)[1+,4,3,3,4,1+]]↔ [(3,3)[31,1,1,1]]↔ [3,4,3,3]	↔ ↔	×6	14, 15, 16, 17

The [4,3,31,1], , Coxeter group generates 31 permutations of uniform tessellations, 23 with distinct symmetry and 4 with distinct geometry. There are two alternated forms: the alternations (19) and (24) have the same geometry as the 16-cell honeycomb and snub 24-cell honeycomb respectively.

B4 honeycombs
Extendedsymmetry	Extendeddiagram	Order	Honeycombs
[4,3,31,1]:		×1	5, 6, 7, 8
<[4,3,31,1]>:↔[4,3,3,4]	↔	×2	9, 10, 11, 12, 13, 14, (10), 15, 16, (13), 17, 18, 19
[3[1+,4,3,31,1]]↔ [3[3,31,1,1]]↔ [3,3,4,3]	↔ ↔	×3	1, 2, 3, 4
[(3,3)[1+,4,3,31,1]]↔ [(3,3)[31,1,1,1]]↔ [3,4,3,3]	↔ ↔	×12	20, 21, 22, 23

There are ten uniform honeycombs constructed by the D ~ 4 {\displaystyle {\tilde {D}}_{4}} Coxeter group, all repeated in other families by extended symmetry, seen in the graph symmetry of rings in the Coxeter–Dynkin diagrams. The 10th is constructed as an alternation. As subgroups in Coxeter notation: [3,4,(3,3)*] (index 24), [3,3,4,3*] (index 6), [1+,4,3,3,4,1+] (index 4), [31,1,3,4,1+] (index 2) are all isomorphic to [31,1,1,1].

The ten permutations are listed with its highest extended symmetry relation:

D4 honeycombs
Extendedsymmetry	Extendeddiagram	Extendedgroup	Honeycombs
[31,1,1,1]		D ~ 4 {\displaystyle {\tilde {D}}_{4}}	(none)
<[31,1,1,1]>↔ [31,1,3,4]	↔	D ~ 4 {\displaystyle {\tilde {D}}_{4}} ×2 = B ~ 4 {\displaystyle {\tilde {B}}_{4}}	(none)
<2[1,131,1]>↔ [4,3,3,4]	↔	D ~ 4 {\displaystyle {\tilde {D}}_{4}} ×4 = C ~ 4 {\displaystyle {\tilde {C}}_{4}}	1, 2
[3[3,31,1,1]]↔ [3,3,4,3]	↔	D ~ 4 {\displaystyle {\tilde {D}}_{4}} ×6 = F ~ 4 {\displaystyle {\tilde {F}}_{4}}	3, 4, 5, 6
[4[1,131,1]]↔ [[4,3,3,4]]	↔	D ~ 4 {\displaystyle {\tilde {D}}_{4}} ×8 = C ~ 4 {\displaystyle {\tilde {C}}_{4}} ×2	7, 8, 9
[(3,3)[31,1,1,1]]↔ [3,4,3,3]	↔	D ~ 4 {\displaystyle {\tilde {D}}_{4}} ×24 = F ~ 4 {\displaystyle {\tilde {F}}_{4}}	7, 8, 9
[(3,3)[31,1,1,1]]+↔ [3+,4,3,3]	↔	½ D ~ 4 {\displaystyle {\tilde {D}}_{4}} ×24 = ½ F ~ 4 {\displaystyle {\tilde {F}}_{4}}	10

Notes

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 24) H.S.M. Coxeter, Regular and Semi-Regular Polytopes III, [Math. Zeit. 200 (1988) 3-45] See p318 [2]
George Olshevsky, Uniform Panoploid Tetracombs, Manuscript (2006) (Complete list of 11 convex uniform tilings, 28 convex uniform honeycombs, and 143 convex uniform tetracombs)
Klitzing, Richard. "4D Euclidean tesselations#4D". x3x3x *b3o *b3o, x3x3x *b3o4o, o3x3o *b3x4o, o4x3x3o4o - batitit - O92
Conway JH, Sloane NJH (1998). Sphere Packings, Lattices and Groups (3rd ed.). Springer. ISBN 0-387-98585-9.

v t e Fundamental convex regular and uniform honeycombs in dimensions 2–9
Space	Family	A ~ n − 1 {\displaystyle {\tilde {A}}_{n-1}}	C ~ n − 1 {\displaystyle {\tilde {C}}_{n-1}}	B ~ n − 1 {\displaystyle {\tilde {B}}_{n-1}}	D ~ n − 1 {\displaystyle {\tilde {D}}_{n-1}}	G ~ 2 {\displaystyle {\tilde {G}}_{2}} / F ~ 4 {\displaystyle {\tilde {F}}_{4}} / E ~ n − 1 {\displaystyle {\tilde {E}}_{n-1}}
E2	Uniform tiling	0[3]	δ3	hδ3	qδ3	Hexagonal
E3	Uniform convex honeycomb	0[4]	δ4	hδ4	qδ4
E4	Uniform 4-honeycomb	0[5]	δ5	hδ5	qδ5	24-cell honeycomb
E5	Uniform 5-honeycomb	0[6]	δ6	hδ6	qδ6
E6	Uniform 6-honeycomb	0[7]	δ7	hδ7	qδ7	222
E7	Uniform 7-honeycomb	0[8]	δ8	hδ8	qδ8	133 • 331
E8	Uniform 8-honeycomb	0[9]	δ9	hδ9	qδ9	152 • 251 • 521
E9	Uniform 9-honeycomb	0[10]	δ10	hδ10	qδ10
E10	Uniform 10-honeycomb	0[11]	δ11	hδ11	qδ11
En-1	Uniform (n-1)-honeycomb	0[n]	δn	hδn	qδn	1k2 • 2k1 • k21

Other names

Related honeycombs

See also

Notes