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Lifting tropical bitangents

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arxiv 1708.04480 v2 pith:PDBTSV5C submitted 2017-08-15 math.AG math.CO

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keywords bitangentstropicalbitangentalgebraicliftingliftslinesquartic
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We study lifts of tropical bitangents to the tropicalization of a given complex algebraic curve together with their lifting multiplicities. Using this characterization, we show that generically all the seven bitangents of a smooth tropical plane quartic lift in sets of four to algebraic bitangents. We do this constructively, i.e. we give solutions for the initial terms of the coefficients of the bitangent lines. This is a step towards a tropical proof that a general smooth quartic admits 28 bitangent lines. The methods are also appropriate to count real bitangents, however the conditions to determine whether a tropical bitangent has real lifts are not purely combinatorial.

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  1. Tropical geometry

    math.AG 2019-08 unverdicted novelty 1.0 of 10

    A pedagogical survey of tropical geometry covering tropical arithmetic, tropical varieties, duality, Bézout's theorem, and tropicalization, with no new research results.

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