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On Decomposition for Pairs of Twisted Contractions 论成对扭曲收缩的分解
IF 0.8 4区 数学
Complex Analysis and Operator Theory Pub Date : 2024-03-10 DOI: 10.1007/s11785-024-01497-2
{"title":"On Decomposition for Pairs of Twisted Contractions","authors":"","doi":"10.1007/s11785-024-01497-2","DOIUrl":"https://doi.org/10.1007/s11785-024-01497-2","url":null,"abstract":"<h3>Abstract</h3> <p>This paper presents Wold-type decomposition for various pairs of twisted contractions on Hilbert spaces. We achieve an explicit decomposition for pairs of twisted contractions such that the c.n.u. parts of the contractions are in <span> <span>(C_{00})</span> </span>. The structure for pairs of doubly twisted operators consisting of a power partial isometry has been discussed. It is also shown that for a pair <span> <span>((T,V^*))</span> </span> of twisted operators with <em>T</em> as a contraction and <em>V</em> as an isometry, there exists a unique (up to unitary equivalence) pair of doubly twisted isometries on the minimal isometric dilation space of <em>T</em>. Finally, we have given a characterization for pairs of doubly twisted isometries. </p>","PeriodicalId":50654,"journal":{"name":"Complex Analysis and Operator Theory","volume":"33 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140099122","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
Approximation by Meromorphic k-Differentials on Compact Riemann Surfaces 紧凑黎曼曲面上的非定常 k 微分逼近论
IF 0.8 4区 数学
Complex Analysis and Operator Theory Pub Date : 2024-03-10 DOI: 10.1007/s11785-024-01494-5
Nadya Askaripour
{"title":"Approximation by Meromorphic k-Differentials on Compact Riemann Surfaces","authors":"Nadya Askaripour","doi":"10.1007/s11785-024-01494-5","DOIUrl":"https://doi.org/10.1007/s11785-024-01494-5","url":null,"abstract":"<p>The main theorem of this article is a Runge type theorem proved for k-differentials <span>((kge 2))</span>. The integrability in the <span>(L^1)</span>- norm is defined for k-differentials in Section 2. We consider k-differentials which are integrable in the defined <span>(L^1)</span>- norm on the Riemann surface, and are holomorphic on an open subset of that surface. We will show those k-differentials can be approximated by meromorphic k-differentials. The proof applies a generalized form of the Poincaré series map. This generalized form is proved in Section 3. Section 2 contains the definition of the Poincaré series and its convergence, with particular focus on the convergence of the Poincaré series for rational functions, which is applied in the main theorem. Sections 3 and 4 contain the new results proved in this paper. The statement and proof of the main theorem are in Section 4.</p>","PeriodicalId":50654,"journal":{"name":"Complex Analysis and Operator Theory","volume":"128 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140099128","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
Two q-Operational Equations and Hahn Polynomials 两个 q 运算方程和哈恩多项式
IF 0.8 4区 数学
Complex Analysis and Operator Theory Pub Date : 2024-03-10 DOI: 10.1007/s11785-024-01496-3
{"title":"Two q-Operational Equations and Hahn Polynomials","authors":"","doi":"10.1007/s11785-024-01496-3","DOIUrl":"https://doi.org/10.1007/s11785-024-01496-3","url":null,"abstract":"<h3>Abstract</h3> <p>Motivated by Liu’s (Sci China Math 66:1199–1216, 2023) recent work. This article reveals the essential features of Hahn polynomials by presenting a new <em>q</em>-exponential operator, that is <span> <span>$$begin{aligned} exp _q(tDelta _{x,a})f(x)=frac{(axt;q)_{infty }}{(xt;q)_{infty }} sum _{n=0}^{infty }frac{t^n}{(q;q)_n} f(q^n x) end{aligned}$$</span> </span>with <span> <span>(Delta _{x,a}=x (1-a)eta _a+eta _x)</span> </span> and <span> <span>(eta _x {f(x) }=f(qx))</span> </span>. Letting <span> <span>(f(x) equiv 1)</span> </span> and the above operator equation immediately becomes the generating function of Hahn polynomials. These lead us to use a systematic method for studying identities involving Hahn polynomials. As applications, we use the method of the <em>q</em>-exponential operator to prove some new <em>q</em>-identities, including <em>q</em>-Nielsen’s formulas and Carlitz’s extension for the Hahn polynomials, etc. Moreover, a generalization of <em>q</em>-Gauss summation is given, too. </p>","PeriodicalId":50654,"journal":{"name":"Complex Analysis and Operator Theory","volume":"68 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140098861","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
Fredholm Index of 3-Tuple of Restriction Operators and the Pair of Fringe Operators for Submodules in $$H^2({mathbb {D}}^3)$$ $$H^2({mathbb {D}}^3)$$ 子模组中限制算子的三元组和边缘算子对的弗雷德霍姆指数
IF 0.8 4区 数学
Complex Analysis and Operator Theory Pub Date : 2024-03-09 DOI: 10.1007/s11785-024-01498-1
Xilin Nie, Anjian Xu
{"title":"Fredholm Index of 3-Tuple of Restriction Operators and the Pair of Fringe Operators for Submodules in $$H^2({mathbb {D}}^3)$$","authors":"Xilin Nie, Anjian Xu","doi":"10.1007/s11785-024-01498-1","DOIUrl":"https://doi.org/10.1007/s11785-024-01498-1","url":null,"abstract":"<p>For a submodule <span>({mathcal {M}})</span> in Hardy module <span>(H^2({mathbb {D}}^n))</span> on the unit polydisc in <span>(mathbb {C}^{n})</span>, we define the <span>(n-1)</span> tuple of fringe operators <span>(textbf{F}=(F_{1},F_{2},ldots ,F_{n-1}))</span> and the <i>n</i> tuple of restriction operators <span>(textbf{R}=(R_{z_{1}},R_{z_{2}},ldots , R_{z_{n}}))</span> with respect to <span>({mathcal {M}})</span>. In this paper, for the case <span>(n=3)</span>, it is shown that the fringe operators <span>(textbf{F})</span> are Fredholm if and only if the tuple <span>(textbf{R}-lambda )</span> is Fredholm, where <span>(lambda in {mathbb {D}}^3)</span>, and moreover <span>(ind(textbf{F})=-ind(mathbf{R-lambda }))</span>, which answer a question of Yang (Proc Am Math Soc 131 (2):533–541, 2003) partly and generalize a result of Luo et al. (J Math Anal Appl 465(1):531–546, 2018) in the case <span>(n=2)</span>. Finally, we also discuss the difference quotient operators in <span>(H^2({mathbb {D}}^n))</span>, and apply them to explore the relationship between the fringe operators and compression operators on quotient module.\u0000</p>","PeriodicalId":50654,"journal":{"name":"Complex Analysis and Operator Theory","volume":"68 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140099257","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
Abstract Algebraic Construction in Fractional Calculus: Parametrised Families with Semigroup Properties 分数微积分中的抽象代数构造：具有半群性质的参数化族
IF 0.8 4区 数学
Complex Analysis and Operator Theory Pub Date : 2024-03-08 DOI: 10.1007/s11785-024-01493-6
Arran Fernandez
{"title":"Abstract Algebraic Construction in Fractional Calculus: Parametrised Families with Semigroup Properties","authors":"Arran Fernandez","doi":"10.1007/s11785-024-01493-6","DOIUrl":"https://doi.org/10.1007/s11785-024-01493-6","url":null,"abstract":"<p>What structure can be placed on the burgeoning field of fractional calculus with assorted kernel functions? This question has been addressed by the introduction of various general kernels, none of which has both a fractional order parameter and a clear inversion relation. Here, we use ideas from abstract algebra to construct families of fractional integral and derivative operators, parametrised by a real or complex variable playing the role of the order. These have the typical behaviour expected of fractional calculus operators, such as semigroup and inversion relations, which allow fractional differential equations to be solved using operational calculus in this general setting, including all types of fractional calculus with semigroup properties as special cases.</p>","PeriodicalId":50654,"journal":{"name":"Complex Analysis and Operator Theory","volume":"36 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140071638","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
Least Energy Sign-Changing Solution for N-Kirchhoff Problems with Logarithmic and Exponential Nonlinearities 具有对数和指数非线性的 N-Kirchhoff 问题的最小能量符号变化解法
IF 0.8 4区 数学
Complex Analysis and Operator Theory Pub Date : 2024-03-08 DOI: 10.1007/s11785-024-01495-4
Ting Huang, Yan-Ying Shang
{"title":"Least Energy Sign-Changing Solution for N-Kirchhoff Problems with Logarithmic and Exponential Nonlinearities","authors":"Ting Huang, Yan-Ying Shang","doi":"10.1007/s11785-024-01495-4","DOIUrl":"https://doi.org/10.1007/s11785-024-01495-4","url":null,"abstract":"<p>In this paper, we are concerned with the existence of least energy sign-changing solutions for the following <i>N</i>-Laplacian Kirchhoff-type problem with logarithmic and exponential nonlinearities: </p><span>$$begin{aligned} left{ begin{array}{ll} -left( a+b int _{Omega }|nabla u|^{N} d xright) Delta _{N} u=|u|^{p-2} u ln |u|^{2}+lambda f(u), &amp;{} text{ in } Omega , u=0, &amp;{} text{ on } partial Omega , end{array}right. end{aligned}$$</span><p>where <i>f</i>(<i>t</i>) behaves like <span>( expleft( {alpha |t|^{{frac{N}{{N - 1}}}} } right) )</span>. Combining constrained variational method, topological degree theory and quantitative deformation lemma, we prove that the problem possesses one least energy sign-changing solution <span>(u_{b})</span> with precisely two nodal domains. Moreover, we show that the energy of <span>(u_{b})</span> is strictly larger than two times of the ground state energy and analyze the convergence property of <span>(u_{b})</span> as <span>(bsearrow 0)</span>.</p>","PeriodicalId":50654,"journal":{"name":"Complex Analysis and Operator Theory","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140071708","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
On Perturbation of Operators and Rayleigh-Schrödinger Coefficients 论扰动算子和瑞利薛定谔系数
IF 0.8 4区 数学
Complex Analysis and Operator Theory Pub Date : 2024-03-04 DOI: 10.1007/s11785-024-01482-9
Marcus Carlsson, Olof Rubin
{"title":"On Perturbation of Operators and Rayleigh-Schrödinger Coefficients","authors":"Marcus Carlsson, Olof Rubin","doi":"10.1007/s11785-024-01482-9","DOIUrl":"https://doi.org/10.1007/s11785-024-01482-9","url":null,"abstract":"<p>Let <i>A</i> and <i>E</i> be self-adjoint matrices or operators on <span>(ell ^2({{mathbb {N}}}))</span>, where <i>A</i> is fixed and <i>E</i> is a small perturbation. We study how the eigenvalues of <span>(A+E)</span> depend on <i>E</i>, with the aim of obtaining second order formulas that are explicitly computable in terms of the spectral decomposition of <i>A</i> and a certain block decomposition of <i>E</i>. In particular we extend the classical Rayleigh-Schrödinger formulas for the one-parameter perturbation <span>(A+tE)</span> where <span>(tin {{mathbb {R}}})</span> varies and <i>E</i> is held fixed, by dropping <i>t</i> and considering <i>E</i> as the variable.</p>","PeriodicalId":50654,"journal":{"name":"Complex Analysis and Operator Theory","volume":"53 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140037348","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
Boas Type Results for Two-Sided Quaternion Fourier Transform and Uniform Lipschitz Spaces 双侧四元数傅里叶变换和均匀 Lipschitz 空间的博厄斯类型结果
IF 0.8 4区 数学
Complex Analysis and Operator Theory Pub Date : 2024-03-04 DOI: 10.1007/s11785-024-01491-8
{"title":"Boas Type Results for Two-Sided Quaternion Fourier Transform and Uniform Lipschitz Spaces","authors":"","doi":"10.1007/s11785-024-01491-8","DOIUrl":"https://doi.org/10.1007/s11785-024-01491-8","url":null,"abstract":"<h3>Abstract</h3> <p>For the quaternion algebra <span> <span>({mathbb {H}})</span> </span> and <span> <span>(f:mathbb R^2rightarrow {mathbb {H}})</span> </span>, we consider a two-sided quaternion Fourier transform <span> <span>(widehat{f})</span> </span>. Necessary and sufficient conditions for <em>f</em> to belong to generalized uniform Lipschitz spaces are given in terms of behavior of <span> <span>(widehat{f})</span> </span>.</p>","PeriodicalId":50654,"journal":{"name":"Complex Analysis and Operator Theory","volume":"10 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140037418","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
On a Class of Subdiagonal Algebras 关于一类子对角线算法
IF 0.8 4区 数学
Complex Analysis and Operator Theory Pub Date : 2024-03-04 DOI: 10.1007/s11785-024-01490-9
{"title":"On a Class of Subdiagonal Algebras","authors":"","doi":"10.1007/s11785-024-01490-9","DOIUrl":"https://doi.org/10.1007/s11785-024-01490-9","url":null,"abstract":"<h3>Abstract</h3> <p>We investigate some new classes of operator algebras which we call semi-<span> <span>(sigma )</span> </span>-finite subdiagonal and Riesz approximable. These constitute the most general setting to date for a noncommutative Hardy space theory based on Arveson’s subdiagonal algebras. We develop this theory and study the properties of these new classes.</p>","PeriodicalId":50654,"journal":{"name":"Complex Analysis and Operator Theory","volume":"42 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140037390","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
Fractional Integration on Mixed Norm Spaces. I 混合规范空间上的分数积分I
IF 0.8 4区 数学
Complex Analysis and Operator Theory Pub Date : 2024-03-02 DOI: 10.1007/s11785-024-01488-3
Feng Guo, Xiang Fang, Shengzhao Hou, Xiaolin Zhu
{"title":"Fractional Integration on Mixed Norm Spaces. I","authors":"Feng Guo, Xiang Fang, Shengzhao Hou, Xiaolin Zhu","doi":"10.1007/s11785-024-01488-3","DOIUrl":"https://doi.org/10.1007/s11785-024-01488-3","url":null,"abstract":"<p>In this paper we characterize completely the septuple </p><span>$$begin{aligned} (p_1, p_2, q_1, q_2; alpha _1, alpha _2; t) in (0, infty ]^4 times (0, infty )^2 times {mathbb {C}} end{aligned}$$</span><p>such that the fractional integration operator <span>({mathfrak {I}}_t)</span>, of order <span>(t in {mathbb {C}})</span>, is bounded between two mixed norm spaces: </p><span>$$begin{aligned} {mathfrak {I}}_t: H(p_1, q_1, alpha _1) rightarrow H(p_2, q_2, alpha _2). end{aligned}$$</span><p>We treat three types of definitions for <span>({mathfrak {I}}_t)</span>: Hadamard, Flett, and Riemann-Liouville. Our main result (Theorem 2) extends that of Buckley-Koskela-Vukotić in 1999 on the Bergman spaces (Theorem B), and the case <span>(t=0)</span> recovers the embedding theorem of Arévalo in 2015 (Corollary 3). The corresponding result for the Hardy spaces <span>(H^p({mathbb {D}}))</span>, of type Riemann-Liouville, is due to Hardy and Littlewood in 1932.</p>","PeriodicalId":50654,"journal":{"name":"Complex Analysis and Operator Theory","volume":"18 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140020096","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
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