Recurrent random walks, Liouville's theorem, and circle packings

Details Recurrent random walks, Liouville's theorem, and circle packings Recurrent random walks, Liouville's theorem, and circle packings

1995-05-10

arxiv.org/abs/math/9505205v1

Mathematics

Metric Geometry

Scientific paper

It has been shown that univalent circle packings filling in the complex plane $\bold C$ are unique up to similarities of $\bold C$. Here we prove that bounded degree branched circle packings properly covering $\bold C$ are uniquely determined, up to similarities of $\bold C$, by their branch sets. In particular, when branch sets of the packings considered are empty we obtain the earlier result. We also establish a circle packing analogue of Liouville's theorem: if $f$ is a circle packing map whose domain packing is infinite, univalent, and has recurrent tangency graph, then the ratio map associated with $f$ is either unbounded or constant.

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