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In geometry, the 3-7 kisrhombille tiling is a semiregular dual tiling of the hyperbolic plane. It is constructed by congruent right triangles with 4, 6, and 14 triangles meeting at each vertex.

3-7 kisrhombille
3-7 kisrhombille.svg
TypeDual semiregular hyperbolic tiling
FacesRight triangle
EdgesInfinite
VerticesInfinite
Coxeter diagramCDel node f1.pngCDel 3.pngCDel node f1.pngCDel 7.pngCDel node f1.png
Symmetry group[7,3], (*732)
Rotation group[7,3]+, (732)
Dual polyhedronTruncated triheptagonal tiling
Face configurationV4.6.14
Propertiesface-transitive

The image shows a Poincaré disk model projection of the hyperbolic plane.

It is labeled V4.6.14 because each right triangle face has three types of vertices: one with 4 triangles, one with 6 triangles, and one with 14 triangles. It is the dual tessellation of the truncated triheptagonal tiling which has one square and one heptagon and one tetrakaidecagon at each vertex.

Contents

NamingEdit

The name 3-7 kisrhombille is given by Conway, seeing it as a 3-7 rhombic tiling, divided by a kis operator, adding a center point to each rhombus, and dividing into four triangles.

SymmetryEdit

There are no mirror removal subgroups of [7,3]. The only small index subgroup is the alternation, [7,3]+, (732).

Small index subgroups of [7,3], (*732)
Type Reflectional Rotational
index 1 2
Diagram    
Coxeter
(orbifold)
[7,3] =      
(*732)
[7,3]+ =      
(732)

Related polyhedra and tilingsEdit

Three isohedral (regular or quasiregular) tilings can be constructed from this tiling by combining triangles:

Projections centered on different triangle points
Poincaré
disk
model
     
Center Heptagon Triangle Rhombic
Klein
disk
model
     
Related
tiling
     
Heptagonal tiling Triangular tiling Rhombic tiling

It is topologically related to a polyhedra sequence; see discussion. This group is special for having all even number of edges per vertex and form bisecting planes through the polyhedra and infinite lines in the plane, and are the reflection domains for the (2,3,n) triangle groups – for the heptagonal tiling, the important (2,3,7) triangle group.

See also the uniform tilings of the hyperbolic plane with (2,3,7) symmetry.

The kisrhombille tilings can be seen as from the sequence of rhombille tilings, starting with the cube, with faces divided or kissed at the corners by a face central point.

 
Visualization of the map (2,3,∞) → (2,3,7) by morphing the associated tilings.[1]

Just as the (2,3,7) triangle group is a quotient of the modular group (2,3,∞), the associated tiling is the quotient of the modular tiling, as depicted in the video at right.

ReferencesEdit

  • 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)

See alsoEdit