Truncated tetraapeirogonal tiling
Truncated tetraapeirogonal tiling | |
---|---|
Poincaré disk model of the hyperbolic plane | |
Type | Hyperbolic uniform tiling |
Vertex configuration | 4.8.∞ |
Schläfli symbol | tr{∞,4} or |
Wythoff symbol | 2 ∞ 4 | |
Coxeter diagram | or |
Symmetry group | [∞,4], (*∞42) |
Dual | Order 4-infinite kisrhombille |
Properties | Vertex-transitive |
In geometry, the truncated tetraapeirogonal tiling is a semiregular tiling of the hyperbolic plane. There are one square, one octagon, and one apeirogon on each vertex. It has Schläfli symbol of tr{∞,4}.
Related polyhedra and tilings
[edit]Paracompact uniform tilings in [∞,4] family | |||||||
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{∞,4} | t{∞,4} | r{∞,4} | 2t{∞,4}=t{4,∞} | 2r{∞,4}={4,∞} | rr{∞,4} | tr{∞,4} | |
Dual figures | |||||||
V∞4 | V4.∞.∞ | V(4.∞)2 | V8.8.∞ | V4∞ | V43.∞ | V4.8.∞ | |
Alternations | |||||||
[1+,∞,4] (*44∞) | [∞+,4] (∞*2) | [∞,1+,4] (*2∞2∞) | [∞,4+] (4*∞) | [∞,4,1+] (*∞∞2) | [(∞,4,2+)] (2*2∞) | [∞,4]+ (∞42) | |
= | = | ||||||
h{∞,4} | s{∞,4} | hr{∞,4} | s{4,∞} | h{4,∞} | hrr{∞,4} | s{∞,4} | |
Alternation duals | |||||||
V(∞.4)4 | V3.(3.∞)2 | V(4.∞.4)2 | V3.∞.(3.4)2 | V∞∞ | V∞.44 | V3.3.4.3.∞ |
*n42 symmetry mutation of omnitruncated tilings: 4.8.2n | ||||||||
---|---|---|---|---|---|---|---|---|
Symmetry *n42 [n,4] | Spherical | Euclidean | Compact hyperbolic | Paracomp. | ||||
*242 [2,4] | *342 [3,4] | *442 [4,4] | *542 [5,4] | *642 [6,4] | *742 [7,4] | *842 [8,4]... | *∞42 [∞,4] | |
Omnitruncated figure | 4.8.4 | 4.8.6 | 4.8.8 | 4.8.10 | 4.8.12 | 4.8.14 | 4.8.16 | 4.8.∞ |
Omnitruncated duals | V4.8.4 | V4.8.6 | V4.8.8 | V4.8.10 | V4.8.12 | V4.8.14 | V4.8.16 | V4.8.∞ |
*nn2 symmetry mutations of omnitruncated tilings: 4.2n.2n | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Symmetry *nn2 [n,n] | Spherical | Euclidean | Compact hyperbolic | Paracomp. | ||||||||||
*222 [2,2] | *332 [3,3] | *442 [4,4] | *552 [5,5] | *662 [6,6] | *772 [7,7] | *882 [8,8]... | *∞∞2 [∞,∞] | |||||||
Figure | ||||||||||||||
Config. | 4.4.4 | 4.6.6 | 4.8.8 | 4.10.10 | 4.12.12 | 4.14.14 | 4.16.16 | 4.∞.∞ | ||||||
Dual | ||||||||||||||
Config. | V4.4.4 | V4.6.6 | V4.8.8 | V4.10.10 | V4.12.12 | V4.14.14 | V4.16.16 | V4.∞.∞ |
Symmetry
[edit]The dual of this tiling represents the fundamental domains of [∞,4], (*∞42) symmetry. There are 15 small index subgroups constructed from [∞,4] by mirror removal and alternation. Mirrors can be removed if its branch orders are all even, and cuts neighboring branch orders in half. Removing two mirrors leaves a half-order gyration point where the removed mirrors met. In these images fundamental domains are alternately colored black and white, and mirrors exist on the boundaries between colors. The subgroup index-8 group, [1+,∞,1+,4,1+] (∞2∞2) is the commutator subgroup of [∞,4].
A larger subgroup is constructed as [∞,4*], index 8, as [∞,4+], (4*∞) with gyration points removed, becomes (*∞∞∞∞) or (*∞4), and another [∞*,4], index ∞ as [∞+,4], (∞*2) with gyration points removed as (*2∞). And their direct subgroups [∞,4*]+, [∞*,4]+, subgroup indices 16 and ∞ respectively, can be given in orbifold notation as (∞∞∞∞) and (2∞).
Small index subgroups of [∞,4], (*∞42) | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Index | 1 | 2 | 4 | ||||||||
Diagram | |||||||||||
Coxeter | [∞,4] | [1+,∞,4] = | [∞,4,1+] = | [∞,1+,4] = | [1+,∞,4,1+] = | [∞+,4+] | |||||
Orbifold | *∞42 | *∞44 | *∞∞2 | *∞222 | *∞2∞2 | ∞2× | |||||
Semidirect subgroups | |||||||||||
Diagram | |||||||||||
Coxeter | [∞,4+] | [∞+,4] | [(∞,4,2+)] | [1+,∞,1+,4] = = = = | [∞,1+,4,1+] = = = = | ||||||
Orbifold | 4*∞ | ∞*2 | 2*∞2 | ∞*22 | 2*∞∞ | ||||||
Direct subgroups | |||||||||||
Index | 2 | 4 | 8 | ||||||||
Diagram | |||||||||||
Coxeter | [∞,4]+ = | [∞,4+]+ = | [∞+,4]+ = | [∞,1+,4]+ = | [∞+,4+]+ = [1+,∞,1+,4,1+] = = = | ||||||
Orbifold | ∞42 | ∞44 | ∞∞2 | ∞222 | ∞2∞2 | ||||||
Radical subgroups | |||||||||||
Index | 8 | ∞ | 16 | ∞ | |||||||
Diagram | |||||||||||
Coxeter | [∞,4*] = | [∞*,4] | [∞,4*]+ = | [∞*,4]+ | |||||||
Orbifold | *∞∞∞∞ | *2∞ | ∞∞∞∞ | 2∞ |
See also
[edit]References
[edit]- John H. Conway, Heidi Burgiel, Chaim Goodman-Strauss, The Symmetries of Things 2008, ISBN 978-1-56881-220-5 (Chapter 19, The Hyperbolic Archimedean Tessellations)
- "Chapter 10: Regular honeycombs in hyperbolic space". The Beauty of Geometry: Twelve Essays. Dover Publications. 1999. ISBN 0-486-40919-8. LCCN 99035678.