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On a characterization of Jeribi, Rakočević, Schechter, Schmoeger and Wolf essential spectra of a 3⨉3 block operator matrices with non diagonal domain and application 非对角域3 * 3块算子矩阵的Jeribi, rako<e:1> eviki, Schechter, Schmoeger和Wolf本质谱的表征及其应用
IF 0.5 4区 数学
Operators and Matrices Pub Date : 2022-01-01 DOI: 10.7153/oam-2022-16-12
N. Moalla, W. Selmi
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引用次数: 0
Spectra of graphenes with variant edges 具有不同边缘的石墨烯光谱
IF 0.5 4区 数学
Operators and Matrices Pub Date : 2022-01-01 DOI: 10.7153/oam-2022-16-71
Hiroaki Niikuni
{"title":"Spectra of graphenes with variant edges","authors":"Hiroaki Niikuni","doi":"10.7153/oam-2022-16-71","DOIUrl":"https://doi.org/10.7153/oam-2022-16-71","url":null,"abstract":". In this paper, we consider a periodic quantum graph corresponding to graphene with a variant of the zigzag shape of boundaries. The aim of this paper is to compare the spectra of our graphs with the spectra of quantum graphs with the standard zigzag boundaries. For this purpose, we utilize a Shnol type theorem and the Cramer’s rule to construct two spectral discriminants D s ( μ , λ ) and D c ( μ , λ ) , where μ = S 1 : = [ − π , π ) is a quasi-momentum of a corresponding fi ber operator and λ ∈ R is a spectral parameter. As a result, we derive pictures of a part of the dispersion relation for our quantum graph.","PeriodicalId":56274,"journal":{"name":"Operators and Matrices","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71223955","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
Numerical radii of weighted shift operators using determinantal polynomials 使用行列式多项式的加权移位算子的数值半径
IF 0.5 4区 数学
Operators and Matrices Pub Date : 2022-01-01 DOI: 10.7153/oam-2022-16-75
Bikshan Chakraborty, Sarita Ojha, R. Birbonshi
{"title":"Numerical radii of weighted shift operators using determinantal polynomials","authors":"Bikshan Chakraborty, Sarita Ojha, R. Birbonshi","doi":"10.7153/oam-2022-16-75","DOIUrl":"https://doi.org/10.7153/oam-2022-16-75","url":null,"abstract":"","PeriodicalId":56274,"journal":{"name":"Operators and Matrices","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71224071","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: 2
Refining and reversing Jensen's inequality 改进并推翻詹森不等式
IF 0.5 4区 数学
Operators and Matrices Pub Date : 2022-01-01 DOI: 10.7153/oam-2022-16-03
Leila Nasiri, A. Zardadi, H. Moradi
{"title":"Refining and reversing Jensen's inequality","authors":"Leila Nasiri, A. Zardadi, H. Moradi","doi":"10.7153/oam-2022-16-03","DOIUrl":"https://doi.org/10.7153/oam-2022-16-03","url":null,"abstract":". This paper is focused on Jensen’s inequality and its variants. Various refinements and reverses of Jensen’s inequality, including scalar and operator versions, are given.","PeriodicalId":56274,"journal":{"name":"Operators and Matrices","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71222525","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: 1
Generalization of Wolff's ideal theorem on H_K(B)^∞(ᵓb) H_K(B)^∞上Wolff理想定理的推广(ᵓB)
IF 0.5 4区 数学
Operators and Matrices Pub Date : 2022-01-01 DOI: 10.7153/oam-2022-16-13
D. Banjade, M. Ephrem
{"title":"Generalization of Wolff's ideal theorem on H_K(B)^∞(ᵓb)","authors":"D. Banjade, M. Ephrem","doi":"10.7153/oam-2022-16-13","DOIUrl":"https://doi.org/10.7153/oam-2022-16-13","url":null,"abstract":"","PeriodicalId":56274,"journal":{"name":"Operators and Matrices","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71222882","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
Disjoint hypercyclic powers of weighted translations on locally compact Hausdorff spaces 局部紧化Hausdorff空间上加权平移的不相交超循环幂
IF 0.5 4区 数学
Operators and Matrices Pub Date : 2022-01-01 DOI: 10.7153/oam-2022-16-14
Ya Wang, Hongyan Zeng
{"title":"Disjoint hypercyclic powers of weighted translations on locally compact Hausdorff spaces","authors":"Ya Wang, Hongyan Zeng","doi":"10.7153/oam-2022-16-14","DOIUrl":"https://doi.org/10.7153/oam-2022-16-14","url":null,"abstract":"","PeriodicalId":56274,"journal":{"name":"Operators and Matrices","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71223068","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
Singular value structure of real matrices which can be expressed as a linear combination of two orthogonal matrices 实数矩阵的奇异值结构，可以表示为两个正交矩阵的线性组合
IF 0.5 4区 数学
Operators and Matrices Pub Date : 2022-01-01 DOI: 10.7153/oam-2022-16-55
Zhenyu Li, Tie Zhang, Chang-Jun Li
{"title":"Singular value structure of real matrices which can be expressed as a linear combination of two orthogonal matrices","authors":"Zhenyu Li, Tie Zhang, Chang-Jun Li","doi":"10.7153/oam-2022-16-55","DOIUrl":"https://doi.org/10.7153/oam-2022-16-55","url":null,"abstract":"","PeriodicalId":56274,"journal":{"name":"Operators and Matrices","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71223983","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: 1
Universally symmetric norming operators are compact 普遍对称的赋范算子是紧的
IF 0.5 4区 数学
Operators and Matrices Pub Date : 2022-01-01 DOI: 10.7153/oam-2022-16-63
S. Pandey
{"title":"Universally symmetric norming operators are compact","authors":"S. Pandey","doi":"10.7153/oam-2022-16-63","DOIUrl":"https://doi.org/10.7153/oam-2022-16-63","url":null,"abstract":". We study a speci fi c family of symmetric norms on the algebra B ( H ) of operators on a separable in fi nite-dimensional Hilbert space. With respect to each symmetric norm in this family the identity operator fails to attain its norm. Using this, we generalize one of the main results from [8]; the hypothesis is relaxed, and consequently, the family of symmetric norms for which the result holds is extended. We introduce and study the concepts of “universally symmetric norming operators” and “universally absolutely symmetric norming operators” on a separable Hilbert space. These refer to the operators that are, respectively, norming and absolutely norming, with respect to every symmetric norm on B ( H ) . We establish a characterization theorem for such operators and prove that these classes are identical, and that they coincide with the class of compact operators. In particular, we provide an alternative characterization of compact operators on a separable in fi nite-dimensional Hilbert space.","PeriodicalId":56274,"journal":{"name":"Operators and Matrices","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71224293","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
Local isometries on subspaces and subalgebras of function spaces 函数空间的子空间和子代数上的局部等距
IF 0.5 4区 数学
Operators and Matrices Pub Date : 2022-01-01 DOI: 10.7153/oam-2022-16-02
Abdullah Bin Abu Baker, Rahul Maurya
{"title":"Local isometries on subspaces and subalgebras of function spaces","authors":"Abdullah Bin Abu Baker, Rahul Maurya","doi":"10.7153/oam-2022-16-02","DOIUrl":"https://doi.org/10.7153/oam-2022-16-02","url":null,"abstract":". Let K denotes the field of real or complex numbers. For a locally compact Hausdorff space X , we denote by C 0 ( X ) the space of all K -valued continuous functions on X vanishing at infinity. Let E be a (real or complex) Banach space, K E be a closed subset of E , and C u ( K E ) be the algebra of all real or complex valued, uniformly continuous bounded functions defined on K E . Endowed with the supremum norm, both C 0 ( X ) and C u ( K E ) are Banach spaces. In this paper we study the structure of local isometries on subspaces of C 0 ( X ) and various subalgebras of C u ( K E ) .","PeriodicalId":56274,"journal":{"name":"Operators and Matrices","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71222480","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: 1
Distinguished subspaces of Topelitz operators on N_ɸ-type quotient modules N_ h型商模上Topelitz算子的可分辨子空间
IF 0.5 4区 数学
Operators and Matrices Pub Date : 2022-01-01 DOI: 10.7153/oam-2022-16-22
Hong Zou, Tao Yu
{"title":"Distinguished subspaces of Topelitz operators on N_ɸ-type quotient modules","authors":"Hong Zou, Tao Yu","doi":"10.7153/oam-2022-16-22","DOIUrl":"https://doi.org/10.7153/oam-2022-16-22","url":null,"abstract":"","PeriodicalId":56274,"journal":{"name":"Operators and Matrices","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71222946","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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