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The Maxwell system in nonhomogeneous anisotropic waveguides with slowly stabilizing characteristics of the filling medium 具有慢稳定填充介质特性的非均匀各向异性波导中的Maxwell系统
IF 0.8 4区 数学 Q3 Mathematics Pub Date : 2023-07-26 DOI: 10.1090/spmj/1773
B. Plamenevskii, A. Poretskii
In a domain having several cylindrical outlets to infinity, the stationary Maxwell system with perfectly conductive boundary conditions is studied. The dielectric permittivity and magnetic permeability are assumed to be arbitrary positive definite matrix-valued functions that slowly stabilize at infinity. The authors introduce the scattering matrix, establish the unique solvability of the problem with radiation conditions at infinity, and describe the asymptotics of solutions.
在具有多个圆柱出口到无穷远的区域上,研究了具有完全导电边界条件的平稳麦克斯韦系统。假设介电常数和磁导率是任意正定的矩阵值函数,在无穷远处缓慢稳定。引入散射矩阵,建立了具有无穷远辐射条件的问题的唯一可解性,并描述了其解的渐近性。
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引用次数: 0
General elementary solution of a 𝑞-sided convolution type homogeneous equation 𝑞-sided卷积型齐次方程的一般初等解
IF 0.8 4区 数学 Q3 Mathematics Pub Date : 2023-07-26 DOI: 10.1090/spmj/1774
Yuriy Saranchuk, A. Shishkin
Exponential polynomials satisfying a homogeneous equation of convolution type are called its elementary solutions. The article is devoted to convolution-type operators in the complex domain that generalize the well-known operators of q q -sided convolution and π pi -convolution. The properties of such operators are investigated and the general form of elementary solutions (general elementary solution) of a homogeneous equation of q q -sided convolution type is described.
满足卷积型齐次方程的指数多项式称为它的初等解。本文研究了复域上的卷积型算子,它推广了著名的q - q边卷积算子和π pi -卷积算子。研究了这类算子的性质,给出了一类q - q边卷积型齐次方程初等解的一般形式。
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引用次数: 0
On the constants in abstract inverse theorems of approximation theory 关于近似理论抽象逆定理中的常数
IF 0.8 4区 数学 Q3 Mathematics Pub Date : 2023-07-26 DOI: 10.1090/spmj/1770
O. Vinogradov
In the classical inverse theorems of constructive function theory, structural characteristics of an approximated function are estimated in terms of its best approximations. Most of the known proofs of the inverse theorems utilize Bernstein’s idea to expand the function in polynomials of its best approximation. In the present paper, Bernstein’s proof is modified by using integrals instead of sums. With this modification, it turns out that desired inequalities are based on identities similar to Frullani integrals. The considerations here are quite general, which allows one to obtain analogs of the inverse theorems for functionals in abstract Banach or even seminormed spaces. Then these abstract results are specified and inverse theorems in concrete spaces of functions are deduced, including weighted spaces, with explicit constants.
在构造函数理论的经典逆定理中,近似函数的结构特征是根据其最佳逼近来估计的。大多数已知的逆定理的证明都利用Bernstein的思想来扩展其最佳逼近多项式中的函数。本文用积分代替和对Bernstein的证明进行了改进。通过这种修改,证明了期望的不等式是基于类似于Frullani积分的恒等式。这里的考虑是相当普遍的,这允许我们在抽象Banach甚至半成形空间中获得泛函逆定理的类似物。然后给出了这些抽象结果,并推导了函数具体空间中的逆定理,包括具有显式常数的加权空间。
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引用次数: 0
Functions of perturbed pairs of noncommutative dissipative operators 扰动非交换耗散算子对的函数
IF 0.8 4区 数学 Q3 Mathematics Pub Date : 2023-06-07 DOI: 10.1090/spmj/1758
A. Aleksandrov, V. Peller

Let a function f f belong to the inhomogeneous analytic Besov space ( B , 1 1 ) + ( R 2 ) (B_{infty ,1}^{,1})_+(mathbb {R}^2) . For a pair ( L , M ) (L,M) of not necessarily commuting maximal dissipative operators, the function f ( L , M ) f(L,M) of L L

设函数f属于非齐次解析Besov空间(B∞,11)+(R2)(B_。对于不必交换的极大耗散算子对(L,M)(L,M),L和M的函数f(L,M.)f(L、M)被定义为稠密定义的线性算子。对于[1,2]中的p∈[1,2]p,证明了如果(L1,M1)(L_1,M_1)和(L2,M2)(L_2,M_22 L_1-L_2和M1−M2 M_1-M_2属于Schatten–von Neumann类S p{boldsymbol S}_p,则对于(mathcyr{B}_{infty,1}^{,1})_+(mathbb{R}^2),算子差f(L1,M1)−f(L2,M2)f(L_1,M_1)-f(L_2,M_2)属于S p{boldsymbol S}_p,并且下面的Lipschitz型估计成立:开始{方程*}-f(L_2,M_2){B}_{infty,1}^{,1}}}maxbig{|L_1-L_2|_{boldsymbol S}_p},|M_1-M_2|_。结束{方程式*}
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引用次数: 0
On the maximal ideal spaces of 𝐇^{∞} on coverings of bordered Riemann surfaces 有边Riemann曲面上的最大理想空间(^{∞}
IF 0.8 4区 数学 Q3 Mathematics Pub Date : 2023-06-07 DOI: 10.1090/spmj/1761
A. Brudnyi
The paper describes the topological structure of the maximal ideal space of the algebra of bounded holomorphic functions on a covering of a bordered Riemann surface. Some applications of the obtained results to the theory of bounded operator-valued holomorphic functions on Riemann surfaces are presented.
本文描述了有界全纯函数代数在有边黎曼曲面上的极大理想空间的拓扑结构。将所得结果应用于Riemann曲面上有界算子值全纯函数理论。
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引用次数: 0
Power dilation systems {𝑓(𝑧^{𝑘})}_{𝑘∈ℕ} in Dirichlet-type spaces 权力扩张系统{𝑓(𝑧^{𝑘})}_{𝑘∈ℕ}在Dirichlet-type空间中
IF 0.8 4区 数学 Q3 Mathematics Pub Date : 2023-06-07 DOI: 10.1090/spmj/1762
H. Dan, K. Guo

Power dilation systems { f ( z k ) } k N {f(z^k)}_{kin mathbb {N}} in Dirichlet-type spaces D t   ( t R ) mathcal {D}_t (tin mathbb {R}) are treated. When t 0 tneq 0 , it is proved that a system of functions { f ( z k )

对dirichlet型空间中幂展开式系统{f(z k)} k∈N {f(z k)}_{kin mathbb {N}}中的dt (t∈R) mathcal {D}_t (tin mathbb {R})进行处理。当t≠0 tneq 0时,证明了一个函数系统{f(z k)} k∈N {f(z k)}_{kin mathbb {N}}在dt mathbb {D}_t中是正交的,只有当f=cz N f=cz^N对于某个常数c c和某个正整数N N。给出了狄利克雷型空间的幂膨胀系统所形成的无条件基和框架的完备刻画。最后,将这些结果应用于dirichlet型空间上矩问题的算符理论情形。
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引用次数: 0
Chapter 7. Angles between invariant subspaces 第7章。不变子空间之间的角度
IF 0.8 4区 数学 Q3 Mathematics Pub Date : 2023-06-07 DOI: 10.1090/spmj/1767
V. Vasyunin
This paper is a chapter from the continuation of a survey by the author and N. K. Nikolski published in 1998. It contains two theorems describing when an invariant subspace has an invariant complement and when the angle between two given invariant subspaces is positive. The presentation involves the technique of the coordinate-free functional model.
本文是作者和N.K.Nikolski于1998年发表的一项调查的续篇。它包含两个定理,描述当不变子空间具有不变补时和当两个给定不变子空间之间的角度为正时。该演示涉及无坐标函数模型的技术。
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引用次数: 0
Stationary phase method, powers of functions, and applications to functional analysis 平稳相方法、函数的幂及其在函数分析中的应用
IF 0.8 4区 数学 Q3 Mathematics Pub Date : 2023-06-07 DOI: 10.1090/spmj/1757
H. Queffélec, R. Zarouf
The utility of the (weighted) van der Corput inequalities or of the stationary phase method is illustrated with various examples borrowed from: differentiability issues (Riemann’s function and related); functional analysis on Banach spaces or algebras of analytic functions (composition operators); and local Banach space geometry (Schäffer’s problem).
(加权的)范德科普特不等式或固定相法的效用是通过从以下几个方面借来的例子来说明的:可微性问题(黎曼函数和相关函数);Banach空间或解析函数代数上的泛函分析(复合算子)和局部巴拿赫空间几何(Schäffer的问题)。
{"title":"Stationary phase method, powers of functions, and applications to functional analysis","authors":"H. Queffélec, R. Zarouf","doi":"10.1090/spmj/1757","DOIUrl":"https://doi.org/10.1090/spmj/1757","url":null,"abstract":"The utility of the (weighted) van der Corput inequalities or of the stationary phase method is illustrated with various examples borrowed from: differentiability issues (Riemann’s function and related); functional analysis on Banach spaces or algebras of analytic functions (composition operators); and local Banach space geometry (Schäffer’s problem).","PeriodicalId":51162,"journal":{"name":"St Petersburg Mathematical Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46166546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Differentiable functions on modules and the equation 𝑔𝑟𝑎𝑑(𝑤)=𝖬𝗀𝗋𝖺𝖽(𝗏) 可微的函数模块和方程𝑔𝑟𝑎𝑑(𝑤)=𝖬𝗀𝗋𝖺𝖽(𝗏)
IF 0.8 4区 数学 Q3 Mathematics Pub Date : 2023-03-22 DOI: 10.1090/spmj/1754
K. Ciosmak

Let A A be a finite-dimensional, commutative algebra over R mathbb {R} or C mathbb {C} . The notion of A A -differentiable functions on A A is extended to develop a theory of A A -differentiable functions on finitely generated A A -modules. Let U U be an open, bounded and convex subset of such a module. An explicit formula is given for A A

设A A是Rmathbb{R}或Cmathbb{C}上的有限维交换代数。推广了A上的A—可微函数的概念,发展了有限生成A—A—模上A—可微分函数的理论。设U U是这样一个模的开、有界和凸子集。在A是单生成且模是任意的情况下,以及在A是任意的且模是自由的情况下给出了关于实或复可微函数的规定类可微性的U U上的A-可微函数。证明了A-可微函数的某些组成部分具有比函数本身更高的可微性。设Mmathsf{M}是一个常数平方矩阵。通过使用上述公式,方程grad的解的完整描述⁡ (w)=M梯度⁡ 给出了(v) operatorname{grad}(w)=mathsf{M} operator name{grad}。建立了广义拉普拉斯方程的一个边值问题,证明了对于给定的边界数据存在唯一解,为此提供了一个公式。
{"title":"Differentiable functions on modules and the equation 𝑔𝑟𝑎𝑑(𝑤)=𝖬𝗀𝗋𝖺𝖽(𝗏)","authors":"K. Ciosmak","doi":"10.1090/spmj/1754","DOIUrl":"https://doi.org/10.1090/spmj/1754","url":null,"abstract":"<p>Let <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"upper A\">\u0000 <mml:semantics>\u0000 <mml:mi>A</mml:mi>\u0000 <mml:annotation encoding=\"application/x-tex\">A</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula> be a finite-dimensional, commutative algebra over <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"double-struck upper R\">\u0000 <mml:semantics>\u0000 <mml:mrow class=\"MJX-TeXAtom-ORD\">\u0000 <mml:mi mathvariant=\"double-struck\">R</mml:mi>\u0000 </mml:mrow>\u0000 <mml:annotation encoding=\"application/x-tex\">mathbb {R}</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula> or <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"double-struck upper C\">\u0000 <mml:semantics>\u0000 <mml:mrow class=\"MJX-TeXAtom-ORD\">\u0000 <mml:mi mathvariant=\"double-struck\">C</mml:mi>\u0000 </mml:mrow>\u0000 <mml:annotation encoding=\"application/x-tex\">mathbb {C}</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula>. The notion of <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"upper A\">\u0000 <mml:semantics>\u0000 <mml:mi>A</mml:mi>\u0000 <mml:annotation encoding=\"application/x-tex\">A</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula>-differentiable functions on <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"upper A\">\u0000 <mml:semantics>\u0000 <mml:mi>A</mml:mi>\u0000 <mml:annotation encoding=\"application/x-tex\">A</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula> is extended to develop a theory of <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"upper A\">\u0000 <mml:semantics>\u0000 <mml:mi>A</mml:mi>\u0000 <mml:annotation encoding=\"application/x-tex\">A</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula>-differentiable functions on finitely generated <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"upper A\">\u0000 <mml:semantics>\u0000 <mml:mi>A</mml:mi>\u0000 <mml:annotation encoding=\"application/x-tex\">A</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula>-modules. Let <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"upper U\">\u0000 <mml:semantics>\u0000 <mml:mi>U</mml:mi>\u0000 <mml:annotation encoding=\"application/x-tex\">U</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula> be an open, bounded and convex subset of such a module. An explicit formula is given for <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"upper A\">\u0000 <mml:semantics>\u0000 <mml:mi>A</mml:mi>\u0000 <mml:annotation encoding=\"application/x-tex\">A</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-form","PeriodicalId":51162,"journal":{"name":"St Petersburg Mathematical Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43863394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nevanlinna characteristic and integral inequalities with maximal radial characteristic for meromorphic functions and for differences of subharmonic functions 亚纯函数和次调和函数差的Nevanlinna特征和具有最大径向特征的积分不等式
IF 0.8 4区 数学 Q3 Mathematics Pub Date : 2023-03-22 DOI: 10.1090/spmj/1753
B. Khabibullin

Let f f be a meromorphic function on the complex plane with Nevanlinna characteristic T ( r , f ) T(r,f) and maximal radial characteristic ln M ( t , f ) ln M(t,f) , where M ( t , f ) M(t,f) is the maximum of the modulus | f | |f| on circles centered at zero and of radius t t . A number of well-known and widely used results make it possible to estimate from

设f是复平面上具有Nevanlinna特征T(r,f)T(r、f)和最大径向特征ln的亚纯函数⁡ M(t,f)ln M(t、f),其中M(t(f)M(t)是以零为中心且半径为t t的圆上的模量|f|f|的最大值。许多众所周知和广泛使用的结果使得从上面估计ln的积分成为可能⁡ 根据t(r,f)t(r、f)和E的线性Lebesgue测度,分段[0,r][0,r]上子集E E上的M(t,f)ln M(t、f)。本文对ln的Lebesgue–Stieltjes积分给出了这样的估计⁡ M(t,f)ln M(t、f)关于递增积分函数M M,并且函数M M不恒定的集合E E可以具有分形性质。同时可以得到集合E E的h-内容和h-Hausdorff测度的非平凡估计,以及它们与d∈(0,1]din的部分d维幂形式(0,1]。作者已知的所有先前的类似估计都对应于d=1d=1的极端情况和密度为LpL^p的绝对连续积分函数m m
{"title":"Nevanlinna characteristic and integral inequalities with maximal radial characteristic for meromorphic functions and for differences of subharmonic functions","authors":"B. Khabibullin","doi":"10.1090/spmj/1753","DOIUrl":"https://doi.org/10.1090/spmj/1753","url":null,"abstract":"<p>Let <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"f\">\u0000 <mml:semantics>\u0000 <mml:mi>f</mml:mi>\u0000 <mml:annotation encoding=\"application/x-tex\">f</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula> be a meromorphic function on the complex plane with Nevanlinna characteristic <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"upper T left-parenthesis r comma f right-parenthesis\">\u0000 <mml:semantics>\u0000 <mml:mrow>\u0000 <mml:mi>T</mml:mi>\u0000 <mml:mo stretchy=\"false\">(</mml:mo>\u0000 <mml:mi>r</mml:mi>\u0000 <mml:mo>,</mml:mo>\u0000 <mml:mi>f</mml:mi>\u0000 <mml:mo stretchy=\"false\">)</mml:mo>\u0000 </mml:mrow>\u0000 <mml:annotation encoding=\"application/x-tex\">T(r,f)</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula> and maximal radial characteristic <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"ln upper M left-parenthesis t comma f right-parenthesis\">\u0000 <mml:semantics>\u0000 <mml:mrow>\u0000 <mml:mi>ln</mml:mi>\u0000 <mml:mo>⁡<!-- ⁡ --></mml:mo>\u0000 <mml:mi>M</mml:mi>\u0000 <mml:mo stretchy=\"false\">(</mml:mo>\u0000 <mml:mi>t</mml:mi>\u0000 <mml:mo>,</mml:mo>\u0000 <mml:mi>f</mml:mi>\u0000 <mml:mo stretchy=\"false\">)</mml:mo>\u0000 </mml:mrow>\u0000 <mml:annotation encoding=\"application/x-tex\">ln M(t,f)</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula>, where <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"upper M left-parenthesis t comma f right-parenthesis\">\u0000 <mml:semantics>\u0000 <mml:mrow>\u0000 <mml:mi>M</mml:mi>\u0000 <mml:mo stretchy=\"false\">(</mml:mo>\u0000 <mml:mi>t</mml:mi>\u0000 <mml:mo>,</mml:mo>\u0000 <mml:mi>f</mml:mi>\u0000 <mml:mo stretchy=\"false\">)</mml:mo>\u0000 </mml:mrow>\u0000 <mml:annotation encoding=\"application/x-tex\">M(t,f)</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula> is the maximum of the modulus <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"StartAbsoluteValue f EndAbsoluteValue\">\u0000 <mml:semantics>\u0000 <mml:mrow>\u0000 <mml:mrow class=\"MJX-TeXAtom-ORD\">\u0000 <mml:mo stretchy=\"false\">|</mml:mo>\u0000 </mml:mrow>\u0000 <mml:mi>f</mml:mi>\u0000 <mml:mrow class=\"MJX-TeXAtom-ORD\">\u0000 <mml:mo stretchy=\"false\">|</mml:mo>\u0000 </mml:mrow>\u0000 </mml:mrow>\u0000 <mml:annotation encoding=\"application/x-tex\">|f|</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula> on circles centered at zero and of radius <inline-formula content-type=\"math/mathml\">\u0000<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"t\">\u0000 <mml:semantics>\u0000 <mml:mi>t</mml:mi>\u0000 <mml:annotation encoding=\"application/x-tex\">t</mml:annotation>\u0000 </mml:semantics>\u0000</mml:math>\u0000</inline-formula>. A number of well-known and widely used results make it possible to estimate from ","PeriodicalId":51162,"journal":{"name":"St Petersburg Mathematical Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45679529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
St Petersburg Mathematical Journal
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