Truncated hexaoctagonal tiling

In geometry, the truncated hexaoctagonal tiling is a semiregular tiling of the hyperbolic plane. There are one square, one dodecagon, and one hexakaidecagon on each vertex. It has Schläfli symbol of tr{8,6}.

Dual tiling

The dual tiling is called an order-6-8 kisrhombille tiling, made as a complete bisection of the order-6 octagonal tiling, here with triangles are shown with alternating colors. This tiling represents the fundamental triangular domains of [8,6] (*862) symmetry.

Symmetry

Truncated hexaoctagonal tiling with mirror lines

There are six reflective subgroup kaleidoscopic constructed from [8,6] by removing one or two of three mirrors. 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⁺,8,1⁺,6,1⁺] (4343) is the commutator subgroup of [8,6].

A radical subgroup is constructed as [8,6*], index 12, as [8,6⁺], (6*4) with gyration points removed, becomes (*444444), and another [8*,6], index 16 as [8⁺,6], (8*3) with gyration points removed as (*33333333).

Small index subgroups of [8,6] (*862)

Index	1	2			4
Diagram
Coxeter	[8,6] =	[1+,8,6] =	[8,6,1+] = =	[8,1+,6] =	[1+,8,6,1+] =	[8+,6+]
Orbifold	*862	*664	*883	*4232	*4343	43×
Semidirect subgroups
Diagram
Coxeter		[8,6+]	[8+,6]	[(8,6,2+)]	[8,1+,6,1+] = = = =	[1+,8,1+,6] = = = =
Orbifold		6*4	8*3	2*43	3*44	4*33
Direct subgroups
Index	2	4			8
Diagram
Coxeter	[8,6]+ =	[8,6+]+ =	[8+,6]+ =	[8,1+,6]+ =	[8+,6+]+ = [1+,8,1+,6,1+] = = =
Orbifold	862	664	883	4232	4343
Radical subgroups
Index		12	24	16	32
Diagram
Coxeter		[8,6*]	[8*,6]	[8,6*]+	[8*,6]+
Orbifold		*444444	*33333333	444444	33333333

Related polyhedra and tilings

From a Wythoff construction there are fourteen hyperbolic uniform tilings that can be based from the regular order-6 octagonal tiling.

Drawing the tiles colored as red on the original faces, yellow at the original vertices, and blue along the original edges, there are 7 forms with full [8,6] symmetry, and 7 with subsymmetry.

See also

• Tilings of regular polygons
• List of uniform planar tilings

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. 

External links

• Weisstein, Eric W.. "Hyperbolic tiling". http://mathworld.wolfram.com/HyperbolicTiling.html. 
• Weisstein, Eric W.. "Poincaré hyperbolic disk". http://mathworld.wolfram.com/PoincareHyperbolicDisk.html. 
• Hyperbolic and Spherical Tiling Gallery
• KaleidoTile 3: Educational software to create spherical, planar and hyperbolic tilings
• Hyperbolic Planar Tessellations, Don Hatch