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Many classical examples of models of self-organized dynamics, including the Cucker-Smale, Motsch-Tadmor, multi-species, and several others, include an alignment force that is based upon density-weighted averaging protocol. Those protocols…

Analysis of PDEs · Mathematics 2024-03-14 Roman Shvydkoy

We determine necessary and sufficient conditions for real algebraic curves near the non-singular tropical limit to be hyperbolic with respect to a point, thus generalising Speyer's classification of stable curves near the tropical limit. In…

Algebraic Geometry · Mathematics 2021-10-01 Cédric Le Texier

We show that the weights on a tropical variety can be recovered from the tropical scheme structure proposed by the Giansiracusas in arXiv:1308.0042, so there is a well-defined Hilbert-Chow morphism from a tropical scheme to the underlying…

Algebraic Geometry · Mathematics 2017-12-12 Diane Maclagan , Felipe Rincón

A valuation-theoretic framework is developed for studying tropical degenerations of multilinear network games. Equilibrium conditions are modeled by an ideal over the Puiseux field, and valuation classes and cluster multiplicities are used…

Algebraic Geometry · Mathematics 2026-05-06 Hangkun Hu , Jingyi Wang , Minggang Wang

We present some relaxation and integral representation results for energy functionals in the setting of structured deformations, with special emphasis given to the case of multi-level structured deformations. In particular, we present an…

Analysis of PDEs · Mathematics 2025-04-23 A. C. Barroso , J. Matias , E. Zappale

We enumerate rational curves in toric surfaces passing through points and satisfying cross-ratio constraints using tropical and combinatorial methods. Our starting point is arXiv:1509.07453, where a tropical-algebraic correspondence theorem…

Algebraic Geometry · Mathematics 2018-05-02 Christoph Goldner

Using tropical geometry one can translate problems in enumerative geometry to combinatorial problems. Thus tropical geometry is a powerful tool in enumerative geometry over the complex and real numbers. Results from $\mathbb{A}^1$-homotopy…

Algebraic Geometry · Mathematics 2024-09-27 Andrés Jaramillo Puentes , Sabrina Pauli

We introduce a generalization of tropical polyhedra able to express both strict and non-strict inequalities. Such inequalities are handled by means of a semiring of germs (encoding infinitesimal perturbations). We develop a tropical…

Combinatorics · Mathematics 2015-01-05 Xavier Allamigeon , Uli Fahrenberg , Stéphane Gaubert , Ricardo D. Katz , Axel Legay

In our adjacent work, we developed a spectral comparison principle for compound cocycles generated by delay equations. It allows to derive frequency inequalities for the uniform exponential stability of such cocycles by means of their…

Dynamical Systems · Mathematics 2026-05-11 Mikhail Anikushin , Andrey Romanov

The three-dimensional generalized tropical climate model with partial viscosity and damping is considered in this paper. Global well-posedness of solutions of the three-dimensional generalized tropical climate model with partial viscosity…

Analysis of PDEs · Mathematics 2024-03-14 Hui Liu , Chengfeng Sun , Mei Li

We define a theory of real $(p,q)$-forms and currents on Berkovich spaces which is parallel to the theory of differential forms on complex spaces. It is based on Lagerberg's theory of superforms in tropical geometry and on the consideration…

Algebraic Geometry · Mathematics 2025-07-29 Antoine Chambert-Loir , Antoine Ducros

This paper introduces a unified model for thermo-poroelasticity and multiple-network poroelasticity, reformulated into a total-pressure-based system. We first establish the well-posedness of the problem via a Galerkin-based argument and…

Numerical Analysis · Mathematics 2026-04-01 Huipeng Gu , Mingchao Cai , Jingzhi Li , Yu Jiang

These notes outline some basic notions of Tropical Geometry and survey some of its applications for problems in classical (real and complex) geometry. To appear in the Proceedings of the Madrid ICM.

Algebraic Geometry · Mathematics 2007-05-23 Grigory Mikhalkin

This article discusses the concept of rational equivalence in tropical geometry (and replaces the older and imperfect version arXiv:0811.2860). We give the basic definitions in the context of tropical varieties without boundary points and…

Algebraic Geometry · Mathematics 2019-10-14 Lars Allermann , Simon Hampe , Johannes Rau

In tropical geometry, given a curve in a toric variety, one defines a corresponding graph embedded in Euclidean space. We study the problem of reversing this process for curves of genus zero and one. Our methods focus on describing curves…

Algebraic Geometry · Mathematics 2016-01-20 David E Speyer

The climate is a complex non-equilibrium dynamical system that relaxes toward a steady state under the continuous input of solar radiation and dissipative mechanisms. The steady state is not necessarily unique. A useful tool to describe the…

Atmospheric and Oceanic Physics · Physics 2023-05-31 Maura Brunetti , Charline Ragon

The response of many materials to applied forces and boundary constraints depends upon internal geometric changes at multiple submacroscopic levels. Hierarchical structured deformations provide a mathematical setting for the description of…

Classical Analysis and ODEs · Mathematics 2025-05-15 Ana Cristina Barroso , José Matias , Marco Morandotti , David R. Owen , Elvira Zappale

We consider the question of when points in tropical affine space uniquely determine a tropical hypersurface. We introduce a notion of multiplicity of points so that this question may be meaningful even if some of the points coincide. We…

Algebraic Geometry · Mathematics 2016-09-26 Drew Johnson

The Ghil-Sellers energy balance model of Earth's climate, features -- for a considerable range of the solar intensity -- two stable climate states (a warm and a cold snowball Earth), where the bistability results from the celebrated…

Atmospheric and Oceanic Physics · Physics 2015-05-20 Tamas Bodai , Valerio Lucarini , Frank Lunkeit , Robert Boschi

Kapranov's theorem is a foundational result in tropical geometry. It states that the set of tropicalisations of points on a hypersurface coincides precisely with the tropical variety of the tropicalisation of the defining polynomial. The…

Algebraic Geometry · Mathematics 2022-10-06 James Maxwell
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