Variational principles for circle patterns and Koebe's theorem
Alexander I. Bobenko, Boris A. Springborn
Abstract
We prove existence and uniqueness results for patterns of circles with prescribed intersection angles in constant curvature surfaces. Our method is based on two new functionals--one for the Euclidean and one for the hyperbolic case. We show how Colin de Verdi`ere's, Br"agger's and Rivin's functionals can be derived from ours.
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