Incidence geometry and universality in the tropical plane

Tropical Incidence Relations, Polytopes, and Concordant Matroids

In this paper, we develop a tropical analog of the classical flag variety that we call the flag Dressian. We find relations, which we call "tropical incidence relations", for when one tropical linear space is contained in another, and show that the flag Dressian is a tropical prevariety. In the case of 2-step flag Dressians, which we call "tropical incidence prevarieties", we find an equivalence between points in this space and induced subdivisions of a hypersimplex, generalizing two parts of an equivalence given by D. Speyer for tropical linear spaces. We attempt to generalize the third part …

洛伦兹多项式与热带线性空间的 incidences 几何

Lorentzian polynomials and the incidence geometry of tropical linear spaces

本文通过洛伦兹正位置概念，研究热带线性空间的incidences几何，揭示经典线性几何性质在热带线性空间中的失效与保留

热带映射和对数映射的普适性

Universality for tropical and logarithmic maps

本文证明每个环面幺半群都出现在从热带曲线到卦限的映射空间中，从而得出对数映射到Artin扇的空间展示任意环面奇点，即对数映射到配对的一个虚拟普适性定理。

First steps in tropical geometry

Tropical algebraic geometry is the geometry of the tropical semiring $(\mathbb{R},\min,+)$. Its objects are polyhedral cell complexes which behave like complex algebraic varieties. We give an introduction to this theory, with an emphasis on plane curves and linear spaces. New results include a complete description of the families of quadrics through four points in the tropical projective plane and a counterexample to the incidence version of Pappus' Theorem.

Point-Line Geometry in the Tropical Plane

We study the classical result by Bruijn and Erd\H os regarding the bound on the number of lines determined by a $n$-point configuration in the plane, and in the light of the recently proven Tropical Sylvester-Gallai theorem, come up with a tropical version of the above-mentioned result. In this work, we introduce stable tropical lines, which help in answering questions pertaining to incidence geometry in the tropical plane. Projective duality in the tropical plane helps in translating the question for stable lines to stable intersections that have been previously studied in depth. Invoking dua…

Generalized permutahedra and positive flag Dressians

We study valuated matroids, their tropical incidence relations, flag matroids and total positivity. This leads to a characterization of permutahedral subdivisions, namely subdivisions of regular permutahedra into generalized permutahedra. Further, we get a characterization of those subdivisions arising from positive valuated flag matroids.