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We show that in multidimensional gravity vector fields completely determine the structure and properties of singularity. It turns out that in the presence of a vector field the oscillatory regime exists for any number of spatial dimensions…

广义相对论与量子宇宙学 · 物理学 2016-11-15 Riccardo Benini , Alexander A. Kirillov , Giovanni Montani

For a given complex projective variety, the existence of entire curves is strongly constrained by the positivity properties of the cotangent bundle. The Green-Griffiths-Lang conjecture stipulates that entire curves drawn on a variety of…

代数几何 · 数学 2021-06-14 Jean-Pierre Demailly

Recently, a geometrical characterization of vector spaces served to generalize them into a new class of algebras. Instead of the algebraic properties of the underlying fields, we generalized the recently discovered property of such spaces…

代数几何 · 数学 2019-01-23 Gabriele Ricci

What is a vector field on a C*-algebra is defined. Its relation to semigroups of endomorphisms was researched. Some results given about those vector fields and semigroups. There are also various constructions of semigroups including one…

数学物理 · 物理学 2012-12-04 Innocenti Maresin

In this work a theorical framework to apply the Poincar\'e compactification technique to locally Lipschitz continuous vector fields is developed. It is proved that these vectors fields are compactifiable in the n-dimensional sphere, though…

动力系统 · 数学 2020-02-07 José Luis Bravo , Manuel Fernández , Antonio E. Teruel

We present a computational method for reconstructing a vector field on a convex polytope $\mathcal{P} \subset \mathbb{R}^d$ of arbitrary dimension from discrete samples. We specifically address the scenario where the vector field is subject…

动力系统 · 数学 2026-02-03 Junyan Chu , Shizuo Kaji

In this short note, we give a new sufficient condition for a linear map from a product of copies of a field to endomorphisms of a finite dimensional vector space over the same field to be an algebra homomorphism. We expect that this result…

环与代数 · 数学 2015-07-31 Rajesh S. Kulkarni , Yusuf Mustopa , Ian Shipman

Let C be a supersingular genus-2 curve over an algebraically closed field of characteristic 3. We show that if C is not isomorphic to the curve y^2 = x^5 + 1 then up to isomorphism there are exactly 20 degree-3 maps phi from C to the…

数论 · 数学 2010-01-23 Everett W. Howe

Every complex plane curve C determines a subscheme S of the $P^8$ of 3x3 matrices, whose projective normal cone (PNC) captures subtle invariants of C. In "Limits of PGL(3)-translates of plane curves, I" we obtain a set-theoretic description…

代数几何 · 数学 2012-04-11 Paolo Aluffi , Carel Faber

We describe derivations of the Clifford algebra of a nondegenerate quadratic form on a countable dimensional vector space over an algebraically closed field of characteristic not equal to $2$. We also construct an algebraic automorphism of…

环与代数 · 数学 2024-08-15 Oksana Bezushchak

Cluster algebras are a recent topic of study and have been shown to be a useful tool to characterize structures in several knowledge fields. An important problem is to establish whether or not a given cluster algebra is of finite type.…

交换代数 · 数学 2015-07-15 Elisângela Silva Dias , Diane Castonguay

A rational vector field on a complex projective smooth surface $S$ is said to be birationally integrable if it generates, by integration, a one-parameter subgroup of the group $\operatorname{Bir}(S)$ of birational transformations of $S$. We…

代数几何 · 数学 2025-09-26 David Marín , Marcel Nicolau

Motivated by applications to duality theorems for $p$-adic pro-\'etale cohomology of rigid analytic spaces, we study the category of Topological Vector Spaces in the setting of condensed mathematics. We prove that it contains, as full…

代数几何 · 数学 2025-11-25 Pierre Colmez , Wiesława Nizioł

We prove that the intrinsic geometry of compact cross-sections of any vacuum extremal horizon must admit a Killing vector field. If the cross-sections are two-dimensional spheres, this implies that the most general solution is the extremal…

广义相对论与量子宇宙学 · 物理学 2026-02-03 Maciej Dunajski , James Lucietti

We study the generalized roundness of finite metric spaces whose distance matrix $D$ has the property that every row of $D$ is a permutation of the first row. The analysis provides a way to characterize subsets of the Hamming cube $\{ 0, 1…

泛函分析 · 数学 2011-12-26 Mathav Kishore Murugan

This paper explores quadratic forms over finite fields with associated Artin-Schreier curves. Specifically, we investigate quadratic forms of $\mathbb F_{q^n}/\mathbb F_q$ represented by polynomials over $\mathbb F_{q^n}$ with $q$ odd,…

数论 · 数学 2024-11-19 Ruikai Chen

The goal of this work is to prove an embedding theorem for compact almost complex manifolds into complex algebraic varieties. It is shown that every almost complex structure can be realized by the transverse structure to an algebraic…

复变函数 · 数学 2016-07-18 Jean-Pierre Demailly , Hervé Gaussier

In this article, we investigate global norm of potential vector field in Ricci soliton. In particular, we have deduced certain conditions so that the potential vector field has finite global norm in expanding Ricci soliton. We have also…

综合数学 · 数学 2021-02-17 Absos Ali Shaikh , Chandan Kumar Mondal , Prosenjit Mandal

We show that in multidimensional gravity vector fields completely determine the structure and properties of singularity. It turns out that in the presence of a vector field the oscillatory regime exists in all spatial dimensions and for all…

广义相对论与量子宇宙学 · 物理学 2009-11-11 R. Benini , A. A. Kirillov , G. Montani

This paper investigates the geometry of smooth canonically polarized surfaces defined over a field of positive characteristic which have a nontrivial global vector field, and the implications that the existence of such surfaces has in the…

代数几何 · 数学 2017-10-18 Nikolaos Tziolas