An Octanomial Model for Cubic Surfaces

16 Aug 2019  ·  Marta Panizzut, Emre Can Sertöz, Bernd Sturmfels ·

We present a new normal form for cubic surfaces that is well suited for p-adic geometry, as it reveals the intrinsic del Pezzo combinatorics of the 27 trees in the tropicalization. The new normal form is a polynomial with eight terms, written in moduli from the E6 hyperplane arrangement. If such a surface is tropically smooth then its 27 tropical lines are distinct. We focus on explicit computations, both symbolic and p-adic numerical.

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Algebraic Geometry 14Q10, 14J26, 14T05, 12J25