Uniform coloring

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Uniform tiling 63-t0.png
111
Uniform tiling 63-t12.png
112
Uniform tiling 333-t012.png
123
The hexagonal tiling has 3 uniform colorings.
The square tiling has 9 uniform colorings:
1111, 1112(a), 1112(b),
1122, 1123(a), 1123(b),
1212, 1213, 1234.

In geometry, a uniform coloring is a property of a uniform figure (uniform tiling or uniform polyhedron) that is colored to be vertex-transitive. Different symmetries can be expressed on the same geometric figure with the faces following different uniform color patterns.

A uniform coloring can be specified by listing the different colors with indices around a vertex figure.

n-uniform figures[edit]

In addition, an n-uniform coloring is a property of a uniform figure which has n types vertex figure, that are collectively vertex transitive.

Archimedean coloring[edit]

A related term is Archimedean color requires one vertex figure coloring repeated in a periodic arrangement. A more general term are k-Archimedean colorings which count k distinctly colored vertex figures.

For example this Archimedean coloring (left) of a triangular tiling has two colors, but requires 4 unique colors by symmetry positions and become a 2-uniform coloring (right):

2-uniform triangular tiling 111112.png
1-Archmedean coloring
111112
2-uniform triangular tiling 112345-121545.png
2-uniform coloring
112344 and 121434

References[edit]

External links[edit]