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A new construction of an absorbing boundary condition for indefinite Helmholtz problems on unbounded domains is presented. This construction is based on a near-best uniform rational interpolant of the inverse square root function on the…

数值分析 · 数学 2015-07-23 Vladimir Druskin , Stefan Güttel , Leonid Knizhnerman

We give upper bounds for the dimension of the set of hypersurfaces of $\mathbb{P}^N$ whose intersection with a fixed integral projective variety is not integral. Our upper bounds are optimal. As an application, we construct, when possible,…

代数几何 · 数学 2019-11-11 Olivier Benoist

We propose a unifying setting for dealing with monodromically atypical intersections that goes beyond the usual Zilber-Pink conjecture. In particular we obtain a new proof of finiteness of the maximal atypical orbit closures in each stratum…

代数几何 · 数学 2025-07-18 Gregorio Baldi , David Urbanik

In this article, we establish an analogue of the dimension growth conjecture, which is regarding the density of rational points on projective varieties, for compact submanifolds of $\mathbb{R}^n$ with non-vanishing curvature. We also…

数论 · 数学 2022-04-19 Shuntaro Yamagishi

Let $K$ be a number field, let $X$ be a smooth integral variety over $K$, and assume that there exists a finite set of finite places $S$ of $K$ such that the $S$-integral points on $X$ are dense. Then the combined conjectures of Campana and…

代数几何 · 数学 2024-10-22 Cedric Luger

For any smooth Riemannian metric on an $(n+1)$-dimensional compact manifold with boundary $(M,\partial M)$ where $3\leq (n+1)\leq 7$, we establish general upper bounds for the Morse index of free boundary minimal hypersurfaces produced by…

微分几何 · 数学 2019-07-30 Qiang Guang , Martin Man-chun Li , Zhichao Wang , Xin Zhou

Let M be a compact, orientable, irreducible, atoroidal 3-manifold with boundary an incompressible torus. Techniques based on the characteristic submanifold theory are used to bound the intersection number of two slopes \alpha and \beta on…

几何拓扑 · 数学 2007-05-23 Steven Boyer , Marc Culler , Peter B. Shalen , Xingru Zhang

We continue the study of intersection bodies of polytopes, focusing on the behavior of $IP$ under translations of $P$. We introduce an affine hyperplane arrangement and show that the polynomials describing the boundary of $I(P+t)$ can be…

度量几何 · 数学 2025-06-02 Marie-Charlotte Brandenburg , Chiara Meroni

In this paper we describe all possible reduced complete intersection sets of points on Veronese surfaces. We formulate a conjecture for the general case of complete intersection subvarieties of any dimension and we prove it in the case of…

代数几何 · 数学 2022-07-08 Stefano Canino , Enrico Carlini

$V$ is a complete intersection scheme in a multiprojective space if it can be defined by an ideal $I$ with as many generators as $\textrm{codim}(V)$. We investigate the multigraded regularity of complete intersections scheme in…

交换代数 · 数学 2021-01-01 Marc Chardin , Navid Nemati

We use an upper bound on Jacobsthal's function to complete a proof of a known density result. Apart from the bound on Jacobsthal's function used here, the proof we are completing uses only elementary methods and Dirichlet's theorem on the…

数论 · 数学 2012-10-04 Timothy Foo

Using the connections among almost complete intersection schemes, arithmetically Gorenstein schemes and schemes that are union of complete intersections we give a structure theorem for arithmetically Cohen-Macaulay union of two complete…

代数几何 · 数学 2012-10-16 Alfio Ragusa , Giuseppe Zappala

We prove new bounds on the number of incidences between points and higher degree algebraic curves. The key ingredient is an improved initial bound, which is valid for all fields. Then we apply the polynomial method to obtain global bounds…

组合数学 · 数学 2015-03-31 Hong Wang , Ben Yang , Ruixiang Zhang

We consider the problem of determining the inducibility (maximum possible asymptotic density of induced copies) of oriented graphs on four vertices. We provide exact values for more than half of the graphs, and very close lower and upper…

组合数学 · 数学 2022-02-18 Łukasz Bożyk , Andrzej Grzesik , Bartłomiej Kielak

Amoebas are projections of complex algebraic varieties in the algebraic torus under a Log-absolute value map, which have connections to various mathematical subjects. While amoebas of hypersurfaces have been intensively studied in recent…

组合数学 · 数学 2017-02-07 Martina Juhnke-Kubitzke , Timo de Wolff

We obtain a lower bound of the degree of irrationality of very general complete intersections over the complex field from the recent results of the first author and Chen--Stapleton. For combining these results, we make a minor adjustment of…

代数几何 · 数学 2022-10-21 Lucas Braune , Taro Yoshino

In the 1980's Serre asked how many points of bounded height can lie in a thin set. This has motivated significant research ever since, culminating in a series of recent breakthroughs. It is a good time to take stock of the central questions…

数论 · 数学 2026-03-25 Dante Bonolis , Lillian B. Pierce , Katharine Woo

Given a point and an expanding map on the unit interval, we consider the set of points for which the forward orbit under this map is bounded away from the given point. For maps like multiplication by an integer modulo 1, such sets have full…

动力系统 · 数学 2009-04-29 David Färm

We consider the density of two-dimensional critical percolation clusters, constrained to touch one or both boundaries, in infinite strips, half-infinite strips, and squares, as well as several related quantities for the infinite strip. Our…

无序系统与神经网络 · 物理学 2007-06-22 Jacob J. H. Simmons , Peter Kleban , Kevin Dahlberg , Robert M. Ziff

We give an attempt to build a classification of planar integral point sets. For two obtained classes, we provide general constructions of upper bounds for minimal diameter of integral point sets in higher dimensions of certain cardinality.…

组合数学 · 数学 2021-11-23 N. N. Avdeev , R. E. Zvolinsky , E. A. Momot