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Conformal surface embeddings and extremal length

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arxiv 1507.05294 v3 pith:JCT52OE7 submitted 2015-07-19 math.CV

classification math.CV
keywords classconformalembeddingextremalhomotopydecreasedembeddingslength
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Given two Riemann surfaces with boundary and a homotopy class of topological embeddings between them, there is a conformal embedding in the homotopy class if and only if the extremal length of every simple multi-curve is decreased under the embedding. Furthermore, the homotopy class has a conformal embedding that misses an open disk if and only if extremal lengths are decreased by a definite ratio. This ratio remains bounded away from one under covers.

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