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 tetrapeirogonal 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
Paracompact uniform tilings in [∞,4] family | |||||||
---|---|---|---|---|---|---|---|
{∞,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
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
Wikimedia Commons has media related to Uniform tiling 4-8-i. |
References
- John H. Conway, Heidi Burgiel, Chaim Goodman-Strass, 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.