Order-8 triangular tiling
| Order-8 triangular tiling | |
|---|---|
| Order-8 triangular tiling Poincaré disk model of the hyperbolic plane | |
| Type | Hyperbolic regular tiling |
| Vertex configuration | 38 |
| Schläfli symbol | {3,8} (3,4,3) |
| Wythoff symbol | 8 | 3 2 4 | 3 3 |
| Coxeter diagram | File:CDel node.pngFile:CDel 8.pngFile:CDel node.pngFile:CDel 3.pngFile:CDel node 1.png File:CDel label4.pngFile:CDel branch.pngFile:CDel split2.pngFile:CDel node 1.png |
| Symmetry group | [8,3], (*832) [(4,3,3)], (*433) [(4,4,4)], (*444) |
| Dual | Octagonal tiling |
| Properties | Vertex-transitive, edge-transitive, face-transitive |
In geometry, the order-8 triangular tiling is a regular tiling of the hyperbolic plane. It is represented by Schläfli symbol of {3,8}, having eight regular triangles around each vertex.
Uniform colorings
The half symmetry [1+,8,3] = [(4,3,3)] can be shown with alternating two colors of triangles:
Symmetry
From [(4,4,4)] symmetry, there are 15 small index subgroups (7 unique) by mirror removal and alternation operators. 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. Adding 3 bisecting mirrors across each fundamental domains creates 832 symmetry. The subgroup index-8 group, [(1+,4,1+,4,1+,4)] (222222) is the commutator subgroup of [(4,4,4)]. A larger subgroup is constructed [(4,4,4*)], index 8, as (2*2222) with gyration points removed, becomes (*22222222). The symmetry can be doubled to 842 symmetry by adding a bisecting mirror across the fundamental domains. The symmetry can be extended by 6, as 832 symmetry, by 3 bisecting mirrors per domain.
Related polyhedra and tilings
| *n32 symmetry mutation of regular tilings: {3,n} | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Spherical | Euclid. | Compact hyper. | Paraco. | Noncompact hyperbolic | |||||||
| File:Trigonal dihedron.svg | File:Uniform tiling 332-t2.png | File:Uniform tiling 432-t2.png | File:Uniform tiling 532-t2.png | File:Uniform polyhedron-63-t2.svg | File:Order-7 triangular tiling.svg | File:H2-8-3-primal.svg | File:H2 tiling 23i-4.png | File:H2 tiling 23j12-4.png | File:H2 tiling 23j9-4.png | File:H2 tiling 23j6-4.png | File:H2 tiling 23j3-4.png |
| 3.3 | 33 | 34 | 35 | 36 | 37 | 38 | 3∞ | 312i | 39i | 36i | 33i |
From a Wythoff construction there are ten hyperbolic uniform tilings that can be based from the regular octagonal and order-8 triangular tilings. Drawing the tiles colored as red on the original faces, yellow at the original vertices, and blue along the original edges, there are 10 forms.
It can also be generated from the (4 3 3) hyperbolic tilings:
See also
- Order-8 tetrahedral honeycomb
- Tilings of regular polygons
- List of uniform planar tilings
- List of regular polytopes
References
- 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.
