Bounded Outdegree and Extremal Length on Discrete Riemann Surfaces

Details Bounded Outdegree and Extremal Length on Discrete Riemann Surfaces Bounded Outdegree and Extremal Length on Discrete Riemann Surfaces

2010-07-03

arxiv.org/abs/1007.0998v1

Conform. Geom. Dyn. 14 (2010), 194-201

Mathematics

Geometric Topology

9 pages, 2 figures

Scientific paper

10.1090/S1088-4173-2010-00210-9

Let $T$ be a triangulation of a Riemann surface. We show that the 1-skeleton of $T$ may be oriented so that there is a global bound on the outdegree of the vertices. Our application is to construct extremal metrics on triangulations formed from $T$ by attaching new edges and vertices and subdividing its faces. Such refinements provide a mechanism of convergence of the discrete triangulation to the classical surface. We will prove a bound on the distortion of the discrete extremal lengths of path families on $T$ under the refinement process. Our bound will depend only on the refinement and not on $T$. In particular, the result does not require bounded degree.

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