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Isoperimetric Formulas for Hyperbolic Animals

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arxiv 2206.14910 v1 pith:K64G7O26 submitted 2022-06-29 math.CO

classification math.CO
keywords animalshyperbolicformulaseuclideanisoperimetricalonganalogousanalogue
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An animal is a planar shape formed by attaching congruent regular polygons along their edges. In 1976, Harary and Harborth gave closed isoperimetric formulas for Euclidean animals. Here, we provide analogous formulas for hyperbolic animals. We do this by proving a connection between Sturmian words and the parameters of a discrete analogue of balls in the graph determined by hyperbolic tessellations. This reveals a complexity in hyperbolic animals that is not present in Euclidean animals.

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