发布求助
文献互助 智能选刊 最新文献

Concrete Operators最新文献

筛选
英文 中文
A Note on Meromorphic Functions Associated With Beseel Function Defined by Hilbert Sapce Operator 关于Hilbert-Sapce算子定义的Beseel函数的亚纯函数的一个注记
IF 0.6
Concrete Operators Pub Date : 2021-01-01 DOI: 10.1515/conop-2020-0114
B. Venkateswarlu, P. Reddy, R. M. Shilpa, G. Swapna
{"title":"A Note on Meromorphic Functions Associated With Beseel Function Defined by Hilbert Sapce Operator","authors":"B. Venkateswarlu, P. Reddy, R. M. Shilpa, G. Swapna","doi":"10.1515/conop-2020-0114","DOIUrl":"https://doi.org/10.1515/conop-2020-0114","url":null,"abstract":"Abstract In this paper,we introduce and study a new subclass of meromorphic functions associated with a certain differential operator on Hilbert space. For this class, we obtain several properties like the coefficient inequality, growth and distortion theorem, radius of close-to-convexity, starlikeness and meromorphically convexity and integral transforms. Further, it is shown that this class is closed under convex linear combinations.","PeriodicalId":53800,"journal":{"name":"Concrete Operators","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/conop-2020-0114","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45072970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The dual of the space of bounded operators on a Banach space Banach空间上有界算子空间的对偶
IF 0.6
Concrete Operators Pub Date : 2021-01-01 DOI: 10.1515/conop-2020-0109
F. Botelho, R. Fleming
{"title":"The dual of the space of bounded operators on a Banach space","authors":"F. Botelho, R. Fleming","doi":"10.1515/conop-2020-0109","DOIUrl":"https://doi.org/10.1515/conop-2020-0109","url":null,"abstract":"Abstract Given Banach spaces X and Y, we ask about the dual space of the 𝒧(X, Y). This paper surveys results on tensor products of Banach spaces with the main objective of describing the dual of spaces of bounded operators. In several cases and under a variety of assumptions on X and Y, the answer can best be given as the projective tensor product of X** and Y*.","PeriodicalId":53800,"journal":{"name":"Concrete Operators","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/conop-2020-0109","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45255468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The Numerical Range of C*ψ Cφ and Cφ C*ψ Cφ和Cφ的数值范围
IF 0.6
Concrete Operators Pub Date : 2021-01-01 DOI: 10.1515/conop-2020-0108
J. Clifford, Michael Dabkowski, Alan D. Wiggins
{"title":"The Numerical Range of C*ψ Cφ and Cφ C*ψ","authors":"J. Clifford, Michael Dabkowski, Alan D. Wiggins","doi":"10.1515/conop-2020-0108","DOIUrl":"https://doi.org/10.1515/conop-2020-0108","url":null,"abstract":"Abstract In this paper we investigate the numerical range of C*bφm Caφn and Caφn C*bφm on the Hardy space where φ is an inner function fixing the origin and a and b are points in the open unit disc. In the case when |a| = |b| = 1 we characterize the numerical range of these operators by constructing lacunary polynomials of unit norm whose image under the quadratic form incrementally foliate the numerical range. In the case when a and b are small we show numerical range of both operators is equal to the numerical range of the operator restricted to a 3-dimensional subspace.","PeriodicalId":53800,"journal":{"name":"Concrete Operators","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/conop-2020-0108","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44425844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Radial growth of the derivatives of analytic functions in Besov spaces Besov空间中解析函数导数的径向增长
IF 0.6
Concrete Operators Pub Date : 2020-12-16 DOI: 10.1515/conop-2020-0107
S. Dominguez, D. Girela
{"title":"Radial growth of the derivatives of analytic functions in Besov spaces","authors":"S. Dominguez, D. Girela","doi":"10.1515/conop-2020-0107","DOIUrl":"https://doi.org/10.1515/conop-2020-0107","url":null,"abstract":"Abstract For 1 < p < ∞, the Besov space Bp consists of those functions f which are analytic in the unit disc 𝔻 = {z ∈ 𝔺 : |z| < 1} and satisfy ∫𝔻(1 − |z|2)p−2|f ′(z)|p dA(z) < ∞. The space B2 reduces to the classical Dirichlet space 𝒟. It is known that if f ∈ 𝒟then |f ′(reiθ)| = o[(1 − r)−1/2], for almost every ∈ [0, 2π]. Hallenbeck and Samotij proved that this result is sharp in a very strong sense. We obtain substitutes of the above results valid for the spaces Bp (1 < p < ∞) an we give also an application of our them to questions concerning multipliers between Besov spaces.","PeriodicalId":53800,"journal":{"name":"Concrete Operators","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/conop-2020-0107","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41538394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Cyclic Composition operators on Segal-Bargmann space Segal Bargmann空间上的循环复合算子
IF 0.6
Concrete Operators Pub Date : 2020-11-27 DOI: 10.1515/conop-2022-0133
G. Ramesh, B. S. Ranjan, D. Naidu
{"title":"Cyclic Composition operators on Segal-Bargmann space","authors":"G. Ramesh, B. S. Ranjan, D. Naidu","doi":"10.1515/conop-2022-0133","DOIUrl":"https://doi.org/10.1515/conop-2022-0133","url":null,"abstract":"Abstract We study the cyclic, supercyclic and hypercyclic properties of a composition operator Cϕ on the Segal-Bargmann space ℋ(ℰ), where ϕ(z) = Az + b, A is a bounded linear operator on ℰ, b ∈ ℰ with ||A|| ⩽ 1 and A*b belongs to the range of (I – A*A)½. Specifically, under some conditions on the symbol ϕ we show that if Cϕ is cyclic then A* is cyclic but the converse need not be true. We also show that if Cϕ* is cyclic then A is cyclic. Further we show that there is no supercyclic composition operator on the space ℋ(ℰ) for certain class of symbols ϕ.","PeriodicalId":53800,"journal":{"name":"Concrete Operators","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45511430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spectrum and Analytic Functional Calculus for Clifford Operators via Stem Functions 基于干函数的Clifford算子的谱与解析泛函演算
IF 0.6
Concrete Operators Pub Date : 2020-08-17 DOI: 10.1515/conop-2020-0115
F. Vasilescu
{"title":"Spectrum and Analytic Functional Calculus for Clifford Operators via Stem Functions","authors":"F. Vasilescu","doi":"10.1515/conop-2020-0115","DOIUrl":"https://doi.org/10.1515/conop-2020-0115","url":null,"abstract":"Abstract The main purpose of this work is the construction of an analytic functional calculus for Clifford operators, which are operators acting on certain modules over Clifford algebras. Unlike in some preceding works by other authors, we use a spectrum defined in the complex plane, and also certain stem functions, analytic in neighborhoods of such a spectrum. The replacement of the slice regular functions, having values in a Clifford algebra, by analytic stem functions becomes possible because of an isomorphism induced by a Cauchy type transform, whose existence is proved in the first part of this work.","PeriodicalId":53800,"journal":{"name":"Concrete Operators","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/conop-2020-0115","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45133726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Li-Yorke chaotic eigen set of the backward shift operator on ℓ2(𝕅) l2上倒移算子的Li-Yorke混沌特征集(𝕅)
IF 0.6
Concrete Operators Pub Date : 2020-01-01 DOI: 10.1515/conop-2020-0105
B. Sanooj, P. Vinodkumar
{"title":"Li-Yorke chaotic eigen set of the backward shift operator on ℓ2(𝕅)","authors":"B. Sanooj, P. Vinodkumar","doi":"10.1515/conop-2020-0105","DOIUrl":"https://doi.org/10.1515/conop-2020-0105","url":null,"abstract":"Abstract In this paper, we prove our main result that the Li-Yorke chaotic eigen set of a positive integer multiple of the backward shift operator on ℓ2 (𝕅) is a disk in the complex plane 𝔺 and the union of such Li-Yorke chaotic eigen set’s is the whole complex plane 𝔺.","PeriodicalId":53800,"journal":{"name":"Concrete Operators","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/conop-2020-0105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48470400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
On some extension of Paley Wiener theorem 关于佩利维纳定理的推广
IF 0.6
Concrete Operators Pub Date : 2020-01-01 DOI: 10.1515/conop-2020-0006
Ettien Yves-Fernand N’Da, K. Kangni
{"title":"On some extension of Paley Wiener theorem","authors":"Ettien Yves-Fernand N’Da, K. Kangni","doi":"10.1515/conop-2020-0006","DOIUrl":"https://doi.org/10.1515/conop-2020-0006","url":null,"abstract":"Abstract Paley Wiener theorem characterizes the class of functions which are Fourier transforms of ℂ∞ functions of compact support on ℝn by relating decay properties of those functions or distributions at infinity with analyticity of their Fourier transform. The theorem is already proved in classical case : the real case with holomorphic Fourier transform on L2(ℝ), the case of functions with compact support on ℝn from Hörmander and the spherical transform on semi simple Lie groups with Gangolli theorem. Let G be a locally compact unimodular group, K a compact subgroup of G, and δ an element of unitary dual ̑K of K. In this work, we’ll give an extension of Paley-Wiener theorem with respect to δ, a class of unitary irreducible representation of K, where G is either a semi-simple Lie group or a reductive Lie group with nonempty discrete series after introducing a notion of δ-orbital integral. If δ is trivial and one dimensional, we obtain the classical Paley-Wiener theorem.","PeriodicalId":53800,"journal":{"name":"Concrete Operators","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/conop-2020-0006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47017767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Compactness and hypercyclicity of co-analytic Toeplitz operators on de Branges-Rovnyak spaces de Branges-Rovnyak空间上共解析Toeplitz算子的紧性和超环性
IF 0.6
Concrete Operators Pub Date : 2020-01-01 DOI: 10.1515/conop-2020-0004
Rim Alhajj
{"title":"Compactness and hypercyclicity of co-analytic Toeplitz operators on de Branges-Rovnyak spaces","authors":"Rim Alhajj","doi":"10.1515/conop-2020-0004","DOIUrl":"https://doi.org/10.1515/conop-2020-0004","url":null,"abstract":"Abstract We study the compactness and the hypercyclicity of Toeplitz operators Tϕ¯,b {T_{bar varphi ,b}} with co-analytic and bounded symbols on de Branges-Rovnyak spaces ℋ(b). For the compactness of Tϕ¯,b {T_{bar varphi ,b}} , we will see that the result depends on the boundary spectrum of b. We will prove that there are non trivial compact operators of the form Tϕ¯,b {T_{bar varphi ,b}} , with ϕ ∈ H∞ ∩ C(𝕋), if and only if m(σ(b) ∩ 𝕋) = 0. We will also show that, when b is non-extreme, then Tϕ¯,b {T_{bar varphi ,b}} is hypercyclic if and only if ϕ is non-constant and ϕ(𝔻) ∩ 𝕋 ≠ ∅.","PeriodicalId":53800,"journal":{"name":"Concrete Operators","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/conop-2020-0004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46226868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The invariant subspaces of S ⊕ S* S∈S的不变子空间*
IF 0.6
Concrete Operators Pub Date : 2020-01-01 DOI: 10.1515/conop-2020-0101
D. Timotin
{"title":"The invariant subspaces of S ⊕ S*","authors":"D. Timotin","doi":"10.1515/conop-2020-0101","DOIUrl":"https://doi.org/10.1515/conop-2020-0101","url":null,"abstract":"Abstract Using the tools of Sz.-Nagy–Foias theory of contractions, we describe in detail the invariant subspaces of the operator S ⊕ S*, where S is the unilateral shift on a Hilbert space. This answers a question of Câmara and Ross.","PeriodicalId":53800,"journal":{"name":"Concrete Operators","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/conop-2020-0101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45587602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信