A Census of Vertices by Generations in Regular Tessellations of the Plane

Details A Census of Vertices by Generations in Regular Tessellations of the Plane A Census of Vertices by Generations in Regular Tessellations of the Plane

2010-06-22

arxiv.org/abs/1006.4356v1

Mathematics

Combinatorics

Scientific paper

We consider regular tessellations of the plane as infinite graphs in which $q$ edges and $q$ faces meet at each vertex, and in which $p$ edges and $p$ vertices surround each face. For $1/p + 1/q = 1/2$, these are tilings of the Euclidean plane; for $1/p + 1/q < 1/2 $, they are tilings of the hyperbolic plane. We choose a vertex as the origin, and classify vertices into generations according to their distance (as measured by the number of edges in a shortest path) from the origin. For all $p\ge 3$ and $q \ge 3$ with $1/p + 1/q \le 1/2 $, we determine the rational generating function giving the number of vertices in each generation.

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