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We study bitangents of non-smooth tropical plane quartics. Our main result is that with appropriate multiplicities, every such curve has 7 equivalence classes of bitangent lines. Moreover, the multiplicity of bitangent lines varies continuously in families of tropical plane curves.
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Heejong Lee, Yoav Len, Bitangents of non-smooth tropical quartics. Port. Math. 75 (2018), no. 1, pp. 67–78DOI 10.4171/PM/2011