Truncated order-4 heptagonal tiling

In geometry, the truncated order-4 heptagonal tiling is a uniform tiling of the hyperbolic plane. It has Schläfli symbol of t{7,4}.

Truncated heptagonal tiling
Poincaré disk model of the hyperbolic plane
Type	Hyperbolic uniform tiling
Vertex configuration	4.14.14
Schläfli symbol	t{7,4}
Wythoff symbol	2 4 | 7 2 7 7 |
Coxeter diagram	or
Symmetry group	[7,4], (*742) [7,7], (*772)
Dual	Order-7 tetrakis square tiling
Properties	Vertex-transitive

Constructions

There are two uniform constructions of this tiling, first by the [7,4] kaleidoscope, and second by removing the last mirror, [7,4,1⁺], gives [7,7], (*772).

Two uniform constructions of 4.7.4.7

Name	Tetraheptagonal	Truncated heptaheptagonal
Image
Symmetry	[7,4] (*742)	[7,7] = [7,4,1+] (*772) =
Symbol	t{7,4}	tr{7,7}
Coxeter diagram

Symmetry

There is only one simple subgroup [7,7]⁺, index 2, removing all the mirrors. This symmetry can be doubled to 742 symmetry by adding a bisecting mirror.

Small index subgroups of [7,7]

Type	Reflectional	Rotational
Index	1	2
Diagram
Coxeter (orbifold)	[7,7] = (*772)	[7,7]+ = (772)

Related polyhedra and tiling

*n42 symmetry mutation of truncated tilings: 4.2n.2n v t e
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]
Truncated figures
Config.	4.4.4	4.6.6	4.8.8	4.10.10	4.12.12	4.14.14	4.16.16	4.∞.∞
n-kis figures
Config.	V4.4.4	V4.6.6	V4.8.8	V4.10.10	V4.12.12	V4.14.14	V4.16.16	V4.∞.∞

Uniform heptagonal/square tilings v t e
Symmetry: [7,4], (*742)							[7,4]+, (742)	[7+,4], (7*2)	[7,4,1+], (*772)
{7,4}	t{7,4}	r{7,4}	2t{7,4}=t{4,7}	2r{7,4}={4,7}	rr{7,4}	tr{7,4}	sr{7,4}	s{7,4}	h{4,7}
Uniform duals
V74	V4.14.14	V4.7.4.7	V7.8.8	V47	V4.4.7.4	V4.8.14	V3.3.4.3.7	V3.3.7.3.7	V77

Uniform heptaheptagonal tilings v t e
Symmetry: [7,7], (*772)							[7,7]+, (772)
= =	= =	= =	= =	= =	= =	= =	= =
{7,7}	t{7,7}	r{7,7}	2t{7,7}=t{7,7}	2r{7,7}={7,7}	rr{7,7}	tr{7,7}	sr{7,7}
Uniform duals
V77	V7.14.14	V7.7.7.7	V7.14.14	V77	V4.7.4.7	V4.14.14	V3.3.7.3.7

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.

See also

• Uniform tilings in hyperbolic plane
• List of regular polytopes

External links

• Weisstein, Eric W. "Hyperbolic tiling". MathWorld.
• Weisstein, Eric W. "Poincaré hyperbolic disk". MathWorld.
• Hyperbolic and Spherical Tiling Gallery
• KaleidoTile 3: Educational software to create spherical, planar and hyperbolic tilings
• Hyperbolic Planar Tessellations, Don Hatch