منابع مشابه
Lifting Tropical Bitangents
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 th...
متن کاملLifting Tropical Intersections
We show that points in the intersection of the tropicalizations of subvarieties of a torus lift to algebraic intersection points with expected multiplicities, provided that the tropicalizations intersect in the expected dimension. We also prove a similar result for intersections inside an ambient subvariety of the torus, when the tropicalizations meet inside a facet of multiplicity 1. The proof...
متن کاملLifting Non-proper Tropical Intersections
We prove that if X,X are closed subschemes of a torus T over a non-Archimedean field K, of complementary codimension and with finite intersection, then the stable tropical intersection along a (possibly positive-dimensional, possibly unbounded) connected component C of Trop(X) ∩ Trop(X) lifts to algebraic intersection points, with multiplicities. This theorem requires potentially passing to a s...
متن کاملObstructions to Lifting Tropical Curves in Hypersurfaces
Tropicalization takes a curve in a hypersurface in 3-space to a balanced rational weighted graph in a tropical surface. In this paper, we study the ‘lifting’ problem: given a graph in a tropical surface, can one find a corresponding algebraic curve in a hypersurface? We develop specific combinatorial obstructions to a graph lifting by studying the factorizations of polynomials with particular N...
متن کاملComputing bitangents for ellipses
We show how to compute the bitangents of two ellipses, and how to evaluate the predicates required to compute objects like convex hulls or visibility complexes for ellipses. Also, we show how to compute the tangency points of the bitangents.
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ژورنال
عنوان ژورنال: Journal of Symbolic Computation
سال: 2020
ISSN: 0747-7171
DOI: 10.1016/j.jsc.2019.02.015