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A molecular decomposition for $H^p(mathbb{Z}^n)$ and applications $H^p(mathbb{Z}^n)$ 的分子分解及其应用
Pub Date : 2024-08-18 DOI: arxiv-2408.09528
Pablo Rocha
In this work, for the range $frac{n-1}{n} < p leq 1$, we give a molecularreconstruction theorem for $H^p(mathbb{Z}^n)$. As an application of thisresult and the atomic decomposition developed by S. Boza and M. Carro in [Proc.R. Soc. Edinb., 132 A (1) (2002), 25-43], we prove that the discrete Rieszpotential $I_{alpha}$ defined on $mathbb{Z}^n$ is a bounded operator$H^p(mathbb{Z}^n) to H^q(mathbb{Z}^n)$ for $frac{n-1}{n} < p <frac{n}{alpha}$ and $frac{1}{q} = frac{1}{p} - frac{alpha}{n}$, where $0< alpha < n$.
在这项工作中,对于 $frac{n-1}{n} 的范围< p leq 1$,我们给出了 $H^p(mathbb{Z}^n)$ 的分子重构定理。作为这一结果以及 S. Boza 和 M. Carro 在 [Proc.R. Soc. Edinb、132 A (1) (2002),25-43]中提出的原子分解[Proc.R. Soc. Edinb, 132 A (1) (2002),25-43]的应用,我们证明了在 $mathbb{Z}^n$ 上定义的离散李斯势 $I_{alpha}$ 是一个有界算子$H^p(mathbb{Z}^n) to H^q(mathbb{Z}^n)$ for $frac{n-1}{n}.< p < {frac{n}{alpha}$ 并且 $frac{1}{q} = frac{1}{p}- 其中 $0< alpha < n$。
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引用次数: 0
Stability of the concentration inequality on polynomials 多项式集中不等式的稳定性
Pub Date : 2024-08-14 DOI: arxiv-2408.07424
María Ángeles García-Ferrero, Joaquim Ortega-Cerdà
In this paper, we study the stability of the concentration inequality forone-dimensional complex polynomials. We provide the stability of the localconcentration inequality and a global version using a Wehrl-type entropy.
本文研究了一维复多项式集中不等式的稳定性。我们提供了局部集中不等式和使用韦尔型熵的全局版本的稳定性。
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引用次数: 0
The finite bivariate biorthogonal I -- Konhauser polynomials 有限双变量双谐波 I - 康豪斯多项式
Pub Date : 2024-08-14 DOI: arxiv-2408.07811
Esra Güldoğan Lekesiz, Bayram Çekim, Mehmet Ali Özarslan
In this paper, a finite set of biorthogonal polynomials in two variables isproduced using Konhauser polynomials. Some properties containing operationaland integral representation, Laplace transform, fractional calculus operatorsof this family are studied. Also, computing Fourier transform for the new set,a new family of biorthogonal functions are derived via Parseval's identity. Onthe other hand, this finite set is modified by adding two new parameters inorder to have semigroup property and construct fractional calculus operators.Further, integral equation and integral operator are also derived for themodified version.
本文利用 Konhauser 多项式生成了一组有限的两变量双谐波多项式。本文研究了该族的运算和积分表示、拉普拉斯变换和分数微积分算子的一些性质。此外,在计算新集合的傅立叶变换时,还通过帕瑟瓦尔特性导出了新的双峰函数族。另一方面,通过添加两个新参数对该有限集进行修改,使其具有半群性质并构造出分数微积分算子。
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引用次数: 0
Generalized square function estimates for curves and their conical extensions 曲线及其圆锥延伸的广义平方函数估计值
Pub Date : 2024-08-14 DOI: arxiv-2408.07248
Robert Schippa
We show sharp square function estimates for curves in the plane whosecurvature degenerates at a point and estimates sharp up to endpoints for conesover these curves. To this end, for curves of finite type we extend theclassical C'ordoba--Fefferman biorthogonality. For cones over degeneratecurves, we analyze wave envelope estimates proved via High-Low-decomposition.The arguments are subsequently extended to the cone over the complex parabola.
我们展示了平面内曲率在某一点退化的曲线的尖锐平方函数估计值,以及这些曲线上圆锥的尖锐端点估计值。为此,对于有限类型的曲线,我们扩展了经典的 C'ordoba--Fefferman 双对偶性。对于退化曲线上的圆锥,我们分析了通过高低分解证明的波包络估计。
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引用次数: 0
Comparison of Gini means with fixed number of variables 固定变量数量下的基尼系数比较
Pub Date : 2024-08-14 DOI: arxiv-2408.07658
Richárd Grünwald, Zsolt Páles
In this paper, we consider the global comparison problem of Gini means withfixed number of variables on a subinterval $I$ of $mathbb{R}_+$, i.e., thefollowing inequality begin{align}tag{$star$}label{ggcabs} G_{r,s}^{[n]}(x_1,dots,x_n) leq G_{p,q}^{[n]}(x_1,dots,x_n), end{align} where $ninmathbb{N},ngeq2$ is fixed, $(p,q),(r,s)inmathbb{R}^2$ and$x_1,dots,x_nin I$. Given a nonempty subinterval $I$ of $mathbb{R}_+$ and $ninmathbb{N}$, weintroduce the relations [ Gamma_n(I):={((r,s),(p,q))inmathbb{R}^2timesmathbb{R}^2mideqref{ggcabs}mbox{ holds for all } x_1,dots,x_nin I},qquad Gamma_infty(I):=bigcap_{n=1}^inftyGamma_n(I). ] In the paper, we investigate the properties of these sets and theirdependence on $n$ and on the interval $I$ and we establish a characterizationsof these sets via a constrained minimum problem by using a variant of theLagrange multiplier rule. We also formulate two open problems at the end of thepaper.
在本文中,我们考虑的是在 $mathbb{R}_+$ 的子区间 $I$ 上具有固定变量数的基尼系数的全局比较问题,即以下不等式G_{r,s}^{[n]}(x_1,dots,x_n) leq G_{p,q}^{[n]}(x_1,dots,x_n), end{align} 其中 $ninmathbb{N},ngeq2$ 是固定的,$(p,q),(r,s)inmathbb{R}^2$ 和 $x_1,dots,x_nin I$.给定 $mathbb{R}_+$ 的非空子区间 $I$ 和 $n/in/mathbb{N}$,我们引入关系 [ Gamma_n(I):={((r,s),(p,q))/inmathbb{R}^2timesmathbb{R}^2mideqref{ggcabs}mbox{ holds for all } x_1,dots,x_nin I},qquadGamma_infty(I):=bigcap_{n=1}^inftyGamma_n(I).]在本文中,我们研究了这些集合的性质及其对 $n$ 和区间 $I$ 的依赖性,并利用拉格朗日乘法法则的变体,通过受限最小问题建立了这些集合的特征。我们还在本文末尾提出了两个悬而未决的问题。
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引用次数: 0
On a criterion of uniform distribution 关于均匀分布的标准
Pub Date : 2024-08-13 DOI: arxiv-2408.07061
Grigori Karagulyan, Iren Petrosyan
We give an extension of a criterion of van der Corput on uniform distributionof sequences. Namely, we prove that a sequence $x_n$ is uniformly distributedmodulo 1 if it is weakly monotonic and satisfies the conditions $Delta^2x_nto0,quad n^2Delta^2x_nto infty $. Our proof is straightforward and uses aDiophantine approximation by rational numbers, while van der Corput's approachis based on some estimates of exponential sums.
我们给出了 van der Corput 关于序列均匀分布准则的扩展。也就是说,我们证明,如果一个序列 $x_n$ 是弱单调的,并且满足条件 $Delta^2x_nto0,quad n^2Delta^2x_nto infty $,那么这个序列就是均匀分布的。 我们的证明简单明了,使用的是有理数的二叉近似,而 van der Corput 的方法是基于指数和的一些估计。
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引用次数: 0
Periodic Source Detection in Discrete Dynamical Systems via space-time sampling 通过时空采样进行离散动态系统中的周期源检测
Pub Date : 2024-08-13 DOI: arxiv-2408.06934
Akram Aldroubi, Carlos Cabrelli, Ursula Molter
In this paper, we examine a discrete dynamical system defined by x(n+1) =Ax(n)+ w(n), where x takes values in a Hilbert space H and w is a periodicsource with values in a fixed closed subspace W of H. Our goal is to identifyconditions on some spatial sampling system G = {gj: j in J} of H that enablestable recovery of the unknown source term w from space-time samples{: n >=0,j in J}. We provide necessary and sufficient conditions on G= {g_j }_{j in J} to ensure stable recovery of any w in W . Additionally, weexplicitly construct an operator R, dependent on G, such thatR{}_n,j} = w.
本文研究了一个离散动力系统,其定义为 x(n+1) =Ax(n)+ w(n),其中 x 取值于希尔伯特空间 H,而 w 是一个周期源,其值位于 H 的一个固定闭合子空间 W 中。我们的目标是确定 H 的某个空间采样系统 G = {gj: J 中的 j} 上的条件,以便能够从时空采样{: n >=0,J 中的 j}中恢复未知源项 w。我们提供了 G= {g_j }_{j in J} 的必要条件和充分条件,以确保稳定恢复 W 中的任何 w。此外,我们还明确构建了一个依赖于 G 的算子 R,使得 R{}_n,j} = w。
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引用次数: 0
Nonlinear non-periodic homogenization: Existence, local uniqueness and estimates 非线性非周期性均质化:存在性、局部唯一性和估计值
Pub Date : 2024-08-13 DOI: arxiv-2408.06705
Lutz Recke
We consider periodic homogenization with localized defects of boundary valueproblems for semilinear ODE systems of the type $$Big((A(x/varepsilon)+B(x/varepsilon))u'(x)+c(x,u(x))Big)'= d(x,u(x)) mbox{for } x in (0,1),; u(0)=u(1)=0. $$ Our assumptions are, roughly speaking, asfollows: $A in L^infty(mathbb{R};mathbb{M}_n)$ is 1-periodic, $B inL^infty(mathbb{R};mathbb{M}_n))cap L^1(mathbb{R};mathbb{M}_n))$, $A(y)$and $A(y)+B(y)$ are positive definite uniformly with respect to $y$,$c(x,cdot),d(x,cdot)in C^1(mathbb{R}^n;mathbb{R}^n))$, $c(cdot,u) inC([0,1];mathbb{R}^n)$ and $d(cdot,u) in L^infty((0,1);mathbb{R}^n)$. Forsmall $varepsilon>0$ we show existence of weak solutions $u=u_varepsilon$ aswell as their local uniqueness for $|u-u_0|_infty approx 0$, where $u_0$ isa given non-degenerate solution to the homogenized problem, and we prove that$|u_varepsilon-u_0|_inftyto 0$ and, if $c(cdot,u)$ is $C^1$-smooth, that$|u_varepsilon-u_0|_infty=O(varepsilon)$ for $varepsilon to 0$. The maintool of the proofs is an abstract result of implicit function theorem typewhich in the past has been applied to singular perturbation as well as toperiodic homogenization of nonlinear ODEs and PDEs and, hence, which permits acommon approach to existence and local uniqueness results for singularlyperturbed problems and for homogenization problems.
我们考虑了$$Big((A(x/varepsilon)+B(x/varepsilon))u'(x)+c(x,u(x))Big)'=d(x,u(x)) 类型的半线性 ODE 系统的边界值问题的局部缺陷的周期同质化问题。$$ 我们的假设大致如下:$A在L^infty(mathbb{R};mathbb{M}_n)$中是1周期的,$B在L^infty(mathbb{R};mathbb{M}_n))cap L^1(mathbb{R};))$,$A(y)$和$A(y)+B(y)$是关于$y$的均匀正定值,$c(x,cdot),d(x,cdot)在C^1(mathbb{R}^n;))$,$c(cdot,u)inC([0,1];mathbb{R}^n)$和$d(cdot,u)in L^infty((0,1);mathbb{R}^n)$。对于小$varepsilon>0$,我们证明了弱解$u=u_varepsilon$的存在性以及它们对于$|u-u_0|_infty approx 0$的局部唯一性,其中$u_0$是均质化问题的给定非退化解、我们证明$|u_varepsilon-u_0|_inftyto 0$,并且,如果$c(cdot,u)$是$C^1$光滑的,那么对于$varepsilon to 0$,$|u_varepsilon-u_0|_infty=O(varepsilon)$。证明的主要工具是隐函数定理类型的抽象结果,它过去曾被应用于奇异扰动以及非线性 ODE 和 PDE 的周期同质化,因此,它允许对奇异扰动问题和同质化问题的存在性和局部唯一性结果采用共同的方法。
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引用次数: 0
A note on the problem of straight-line interpolation by ridge functions 关于脊函数直线插值问题的说明
Pub Date : 2024-08-12 DOI: arxiv-2408.06443
Azer Akhmedov, Vugar Ismailov
In this paper we discuss the problem of interpolation on straight lines bylinear combinations of ridge functions with fixed directions. By using somegeometry and/or systems of linear equations, we constructively prove that it isimpossible to interpolate arbitrary data on any three or more straight lines bysums of ridge functions with two fixed directions. The general case with morestraight lines and more directions is reduced to the problem of existence ofcertain sets in the union of these lines.
本文讨论了用具有固定方向的脊函数的线性组合对直线进行插值的问题。通过使用一些几何和/或线性方程组,我们构造性地证明了不可能用具有两个固定方向的脊函数总和对任意三条或更多直线上的任意数据进行插值。在有更多直线和更多方向的一般情况下,则简化为在这些直线的结合处存在某些集合的问题。
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引用次数: 0
On bounds for ratios of contiguous hypergeometric functions 论连续超几何函数比率的界限
Pub Date : 2024-08-10 DOI: arxiv-2408.05573
Javier Segura
We review recent results on analytical properties (monotonicity and bounds)for ratios of contiguous functions of hypergeometric type. The cases ofparabolic cylinder functions and modified Bessel functions have been discussedwith considerable detail in the literature, and we give a brief account ofthese results, completing some aspects in the case of parabolic cylinderfunctions. Different techniques for obtaining these bounds are considered. Theyare all based on simple qualitative descriptions of the solutions of associatedODEs (mainly Riccati equations, but not only Riccati). In spite of theirsimplicity, they provide the most accurate global bounds known so far. We alsoprovide examples of application of these ideas to the more general cases of theKummer confluent function and the Gauss hypergeometric function. The functionratios described in this paper are important functions appearing in a largenumber of applications, in which simple approximations are very often required.
我们回顾了有关超几何型连续函数比的分析性质(单调性和边界)的最新结果。抛物柱面函数和修正贝塞尔函数的情况已在文献中进行了相当详细的讨论,我们简要介绍了这些结果,并完成了抛物柱面函数情况下的某些方面。我们考虑了获得这些边界的不同技术。它们都基于对相关 ODE(主要是 Riccati 方程,但不仅限于 Riccati)解的简单定性描述。尽管这些方法很简单,但它们提供了迄今已知的最精确的全局边界。我们还举例说明了这些思想在库默汇合函数和高斯超几何函数等更一般情况下的应用。本文中描述的函数比是出现在大量应用中的重要函数,在这些应用中经常需要简单的近似值。
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引用次数: 0
期刊
arXiv - MATH - Classical Analysis and ODEs
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