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Lifting Arc Diagrams Under Branched Covers: An Inverse Problem and its Solution

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arxiv 2009.05608 v1 pith:Z7O65HJA submitted 2020-09-11 math.CO math.GT

classification math.COmath.GT
keywords branchedliftingsolutioncoveringdiagramdiagramsproblemweighted
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A branched covering map of surfaces induces a map in the opposite direction between their arc complexes. We represent a branched covering map combinatorially using what we call a lifting picture, and use this representation to computably solve the membership problem of the set of weighted arc diagrams on a given surface which can be obtained by lifting a weighted arc diagram on a bigon. We provide a brute force solution in the general case, and an efficient solution when the input arc diagram is a triangulation.

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