Subjects -> MATHEMATICS (Total: 1013 journals)
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    - PROBABILITIES AND MATH STATISTICS (113 journals)

MATHEMATICS (714 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 4)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 4)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 13)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 5)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 6)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 43)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 2)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 3)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 5)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 9)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 7)
Advances in Complex Systems     Hybrid Journal   (Followers: 10)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 16)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 3)
Advances in Fixed Point Theory     Open Access  
Advances in Geosciences (ADGEO)     Open Access   (Followers: 20)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 6)
Advances in Materials Science     Open Access   (Followers: 21)
Advances in Mathematical Physics     Open Access   (Followers: 6)
Advances in Mathematics     Full-text available via subscription   (Followers: 18)
Advances in Numerical Analysis     Open Access   (Followers: 4)
Advances in Operations Research     Open Access   (Followers: 13)
Advances in Operator Theory     Hybrid Journal  
Advances in Pure Mathematics     Open Access   (Followers: 10)
Advances in Science and Research (ASR)     Open Access   (Followers: 9)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 8)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 5)
Afrika Matematika     Hybrid Journal   (Followers: 2)
Air, Soil & Water Research     Open Access   (Followers: 6)
AKSIOMATIK : Jurnal Penelitian Pendidikan dan Pembelajaran Matematika     Open Access  
Al-Jabar : Jurnal Pendidikan Matematika     Open Access  
Al-Qadisiyah Journal for Computer Science and Mathematics     Open Access   (Followers: 3)
AL-Rafidain Journal of Computer Sciences and Mathematics     Open Access   (Followers: 4)
Algebra and Logic     Hybrid Journal   (Followers: 9)
Algebra Colloquium     Hybrid Journal   (Followers: 3)
Algebra Universalis     Hybrid Journal   (Followers: 3)
Algorithmic Operations Research     Open Access   (Followers: 6)
Algorithms     Open Access   (Followers: 14)
Algorithms Research     Open Access   (Followers: 1)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 4)
American Journal of Mathematical Analysis     Open Access   (Followers: 1)
American Journal of Mathematical and Management Sciences     Hybrid Journal  
American Journal of Mathematics     Full-text available via subscription   (Followers: 7)
American Journal of Operations Research     Open Access   (Followers: 6)
American Mathematical Monthly     Full-text available via subscription   (Followers: 3)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 12)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access  
Analysis and Applications     Hybrid Journal   (Followers: 2)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 7)
Anargya : Jurnal Ilmiah Pendidikan Matematika     Open Access  
Annales Mathematicae Silesianae     Open Access  
Annales mathématiques du Québec     Hybrid Journal   (Followers: 3)
Annales Universitatis Mariae Curie-Sklodowska, sectio A – Mathematica     Open Access   (Followers: 1)
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica     Open Access  
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 15)
Annals of Functional Analysis     Hybrid Journal   (Followers: 2)
Annals of Mathematics     Full-text available via subscription   (Followers: 5)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 13)
Annals of PDE     Hybrid Journal  
Annals of Pure and Applied Logic     Open Access   (Followers: 5)
Annals of the Alexandru Ioan Cuza University - Mathematics     Open Access   (Followers: 1)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1)
Annals of West University of Timisoara - Mathematics     Open Access   (Followers: 1)
Annals of West University of Timisoara - Mathematics and Computer Science     Open Access   (Followers: 2)
Annuaire du Collège de France     Open Access   (Followers: 6)
ANZIAM Journal     Open Access   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applications of Mathematics     Hybrid Journal   (Followers: 3)
Applied Categorical Structures     Hybrid Journal   (Followers: 5)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 7)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal   (Followers: 1)
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 1)
Applied Mathematics Letters     Full-text available via subscription   (Followers: 3)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 1)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 4)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 3)
Arabian Journal of Mathematics     Open Access   (Followers: 1)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 4)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Armenian Journal of Mathematics     Open Access  
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites     Open Access   (Followers: 21)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
Asian Research Journal of Mathematics     Open Access  
Asian-European Journal of Mathematics     Hybrid Journal   (Followers: 2)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 5)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 1)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Axioms     Open Access   (Followers: 1)
Baltic International Yearbook of Cognition, Logic and Communication     Open Access   (Followers: 2)
Banach Journal of Mathematical Analysis     Hybrid Journal  
Basin Research     Hybrid Journal   (Followers: 6)
BIBECHANA     Open Access  
Biomath     Open Access  
BIT Numerical Mathematics     Hybrid Journal  
Boletim Cearense de Educação e História da Matemática     Open Access  
Boletim de Educação Matemática     Open Access  
Boletín de la Sociedad Matemática Mexicana     Hybrid Journal  
Bollettino dell'Unione Matematica Italiana     Full-text available via subscription  
British Journal for the History of Mathematics     Hybrid Journal   (Followers: 2)
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 18)
British Journal of Mathematics & Computer Science     Full-text available via subscription   (Followers: 1)
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 2)
Bulletin des Sciences Mathamatiques     Full-text available via subscription   (Followers: 3)
Bulletin of Dnipropetrovsk University. Series : Communications in Mathematical Modeling and Differential Equations Theory     Open Access   (Followers: 3)
Bulletin of Mathematical Sciences     Open Access   (Followers: 1)
Bulletin of Symbolic Logic     Full-text available via subscription   (Followers: 4)
Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics     Open Access  
Bulletin of the Australian Mathematical Society     Full-text available via subscription   (Followers: 2)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the Iranian Mathematical Society     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 3)
Bulletin of the Malaysian Mathematical Sciences Society     Hybrid Journal  
Cadernos do IME : Série Matemática     Open Access  
Calculus of Variations and Partial Differential Equations     Hybrid Journal   (Followers: 1)
Canadian Journal of Mathematics / Journal canadien de mathématiques     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 20)
Canadian Mathematical Bulletin     Hybrid Journal  
Carpathian Mathematical Publications     Open Access  
Catalysis in Industry     Hybrid Journal  
CAUCHY     Open Access   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 5)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 1)
Chaos, Solitons & Fractals : X     Open Access   (Followers: 1)
ChemSusChem     Hybrid Journal   (Followers: 8)
Chinese Annals of Mathematics, Series B     Hybrid Journal  
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Mathematics     Open Access  
Ciencia     Open Access  
CODEE Journal     Open Access  
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Hybrid Journal   (Followers: 3)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 5)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 20)
Commentarii Mathematici Helvetici     Hybrid Journal   (Followers: 1)
Communications in Combinatorics and Optimization     Open Access  
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 3)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 6)
Complex Analysis and its Synergies     Open Access   (Followers: 1)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Compositio Mathematica     Full-text available via subscription   (Followers: 2)
Comptes Rendus : Mathematique     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 3)
Computational and Mathematical Methods     Hybrid Journal  
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 5)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 11)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 9)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 10)
Confluentes Mathematici     Hybrid Journal  
Constructive Mathematical Analysis     Open Access  
Contributions to Discrete Mathematics     Open Access  
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal   (Followers: 1)
Cross Section     Full-text available via subscription   (Followers: 1)
Cryptography and Communications     Hybrid Journal   (Followers: 11)
Cuadernos de Investigación y Formación en Educación Matemática     Open Access  
Cubo. A Mathematical Journal     Open Access  
Current Research in Biostatistics     Open Access   (Followers: 8)
Czechoslovak Mathematical Journal     Hybrid Journal  
Daya Matematis : Jurnal Inovasi Pendidikan Matematika     Open Access  
Demographic Research     Open Access   (Followers: 14)
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 35)
Desimal : Jurnal Matematika     Open Access  
Dhaka University Journal of Science     Open Access  
Differential Equations and Dynamical Systems     Hybrid Journal   (Followers: 2)
Differentsial'nye Uravneniya     Open Access  
Digital Experiences in Mathematics Education     Hybrid Journal   (Followers: 3)
Discrete Mathematics     Hybrid Journal   (Followers: 7)
Discrete Mathematics & Theoretical Computer Science     Open Access   (Followers: 1)
Discrete Mathematics, Algorithms and Applications     Hybrid Journal   (Followers: 2)
Discussiones Mathematicae - General Algebra and Applications     Open Access  
Discussiones Mathematicae Graph Theory     Open Access   (Followers: 1)
Diskretnaya Matematika     Full-text available via subscription  
Doklady Akademii Nauk     Open Access  

        1 2 3 4 | Last

Similar Journals
Journal Cover
Advances in Operator Theory
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2662-2009 - ISSN (Online) 2538-225X
Published by Springer-Verlag Homepage  [2467 journals]
  • Triebel–Lizorkin spaces with general weights

    • Free pre-print version: Loading...

      Abstract: Abstract In this paper, the author introduces Triebel–Lizorkin spaces with general smoothness. We present the \(\varphi\) -transform characterization of these spaces in the sense of Frazier and Jawerth and we prove their Sobolev embeddings. Also, we establish the smooth atomic and molecular decomposition of these function spaces. To do these we need a generalization of some maximal inequality to the case of general weights.
      PubDate: 2022-11-15
       
  • Asymmetric Fuglede–Putnam theorem for unbounded M-hyponormal
           operators

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      Abstract: Abstract A closed densely defined operator T on a Hilbert space \({\mathcal {H}}\) is called M-hyponormal if \({\mathcal {D}}(T) \subset {\mathcal {D}}(T^{*})\) and there exists \(M>0\) for which \(\Vert (T-zI)^{*}x \Vert \le M \Vert (T-zI)x \Vert \) for all \(z \in {\mathbb {C}}\) and \(x\in {\mathcal {D}}(T)\) . In this paper, we prove that if \(A:{\mathcal {H}}\rightarrow {\mathcal {K}}\) is a bounded linear operator, such that \(AB^*\subseteq TA\) , where B is a closed subnormal (resp. a closed M-hyponormal) on \({\mathcal {H}}\) , T is a closed M-hyponormal (resp. a closed subnormal) on a Hilbert space \({\mathcal {K}}\) , then (i) \( AB\subseteq T^*A\) (ii) \({\overline{\text{ ran }\,A^{*}}}\) reduces B to the normal operator \( B\vert _{{\overline{\text{ ran }\,A^{*}}}}\) and (iii) \({\overline{\text{ ran }\,A}}\) reduces T to the normal operator \( T\vert _{{\overline{\text{ ran }\,A}}}\) .
      PubDate: 2022-11-14
       
  • Further refinements and reverses of the Hermite–Hadamard inequalities
           for multivariate operator convex maps

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      Abstract: Abstract The Hermite–Hadamard inequalities attract many researchers and are useful theoretical point of view as well as in practical purposes. Some properties, extensions, refinements, reverses and applications of these inequalities have been carried out recently. In this paper, we investigate some refinements and reverses for the Hermite–Hadamard inequalities when the integrand map is operator convex (resp. operator concave) in multiple operator arguments. As application, some inequalities for multivariate operator means are provided.
      PubDate: 2022-11-07
       
  • Norm estimates for the pseudo-differential operator involving fractional
           Hankel-like transform on $${\mathcal {S}}$$ -type spaces

    • Free pre-print version: Loading...

      Abstract: Abstract In this article, we focus on the continuity as well as boundedness properties of fractional Hankel-like transform and pseudo-differential operator associated with a fractional Hankel-like transform on some suitably designed Gelfand–Shilov spaces of type \({\mathcal {S}}\) . Moreover, we have further investigated on certain class of ultradifferentiable function spaces for the above integral transform and operator.
      PubDate: 2022-10-31
       
  • A four-point $$\phi $$ -Laplacian BVPs with first-order derivative
           dependence

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      Abstract: Abstract This paper concerns existence of positive solutions for a second-order boundary value problem associated with a \(\phi \) -Laplacian operator and the four point boundary conditions and posed on the bounded interval. Existence results are obtained by an adapted version of the Krasnosel’skii’s fixed point theorem of cone expansion and compression. Some examples illustrate our existence results.
      PubDate: 2022-10-23
       
  • Behavior of Kreiss bounded $$C_0$$ -semigroups on a Hilbert space

    • Free pre-print version: Loading...

      Abstract: Abstract We prove that a Kreiss bounded \(C_0\) semigroup \((T_t)_{t \ge 0}\) on a Hilbert space has asymptotics \(\left\ T_t\right\ = {\mathcal{O}}\big (t/\sqrt{\log (t)}\big ).\) Then, we give an application to perturbed wave equation.
      PubDate: 2022-10-06
       
  • A pair of fractional Hankel–Clifford transform on Sobolev-type spaces:
           theory, examples, and applications

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      Abstract: Abstract This paper defines two definitions for Sobolev-type spaces using fractional Hankel–Clifford transform pairs. We constructed an example in each space and obtained its solution. We also proved that these spaces are complete. Further, we derived the boundedness properties of the product and convolution of these spaces. Furthermore, we provided some applications of fractional Hankel–Clifford transform pairs to solve analytically generalized homogeneous partial differential equations with variable coefficients. Finally, we illustrated the solution surface profiles for generalized homogeneous partial differential equations with variable coefficients in 3D view to show the analytical solution more elegantly.
      PubDate: 2022-10-05
       
  • Legendre functions, related Lebedev–Skalskaya transforms pairs and
           associated operators

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      Abstract: Abstract In this paper, a brief study is made on the Legendre function related to the Lebedev–Skalskaya transform (LSL-transform) pairs. Some preliminary useful results are obtained. The translation and convolution operators are introduced and obtained their estimates on Lebesgue space. Further, continuity mapping of LSL-transforms, the translation and convolution operators are discussed over the function spaces \({\mathfrak {H}}^{m,n}\) and \({\mathfrak {G}}^{k,n}\) . Moreover, pseudo-differential operators involving LSL-transforms are defined and studied their continuity property over the spaces \({\mathfrak {H}}^{m,n}\) and \({\mathfrak {G}}^{k,n}\) . An integral representation of pseudo-differential operators are also given.
      PubDate: 2022-10-03
       
  • Carleson measures on Dirichlet type spaces in the quaternionic unit ball

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      Abstract: Abstract In this paper, we characterize Carleson measures on the Dirichlet type space \(\mathcal D_{\alpha }^{p}\) for different values of p, q and \(\alpha\) and in terms of axially symmetric completion of a pseudohyperbolic disc.
      PubDate: 2022-10-01
       
  • Morita equivalence of w*-rigged modules

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      Abstract: Abstract The w*-rigged modules over dual operator algebras were introduced by Blecher and Kashyap as a generalization of W*-modules. In this paper, we introduce two new types of Morita equivalence between right w*-rigged modules over unital dual operator algebras and we examine whether these notions imply stable isomorphism between the corresponding modules. Furthermore, we investigate them in detail for the class of right w*-rigged modules over nest algebras, a class which was characterized by G.K. Eleftherakis.
      PubDate: 2022-09-28
       
  • Multiplication by finite Blaschke factors on a general class of Hardy
           spaces

    • Free pre-print version: Loading...

      Abstract: Abstract A broader class of Hardy spaces and Lebesgue spaces have been introduced recently on the unit circle by considering continuous \(\Vert \cdot \Vert _1\) -dominating normalized gauge norms instead of the classical norms on measurable functions. A Beurling type result has been proved for the operator of multiplication by the coordinate function. In this paper, we generalize the above Beurling type result to the context of multiplication by a finite Blaschke factor B(z) and also derive the common invariant subspaces of \(B^2(z)\) and \(B^3(z).\) These results lead to a factorization result for all functions in the Hardy space equipped with a continuous rotationally symmetric norm.
      PubDate: 2022-09-27
       
  • Generalized Halmos conjectures and constrained unitary dilations

    • Free pre-print version: Loading...

      Abstract: Abstract In this paper, we investigate a problem of Halmos on various generalizations of the numerical range. We generalize a finite-dimensional result of Gau, Li and Wu, by showing that for \(k\in {\mathbb {N}},\) the closure of the rank-k numerical range of a contraction T acting on a separable Hilbert space \({\mathcal{H}}\) is the intersection of the closure of the rank-k numerical ranges of all unitary dilations of T to \({\mathcal{H}}\oplus {\mathcal{H}}.\) The same is true for \(k=\infty\) provided the rank- \(\infty\) numerical range of T is non-empty. We also show that when both defect indices of a contraction are equal and finite ( \(=N\) ), one may restrict the intersection to a smaller family consisting of all unitary N-dilations. We also investigate this problem in the matricial range and the C-numerical range. We obtain a few interesting results and conclude the answers in negative.
      PubDate: 2022-09-23
       
  • Operator inequalities related to Young’s inequality

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      Abstract: Abstract We show several operator inequalities concerning Young’s inequality by using relative operator entropies and operator valued \(\alpha \) -divergence. One of them is partially a refinement of Young’s inequality.
      PubDate: 2022-09-21
      DOI: 10.1007/s43036-022-00220-2
       
  • On the multiplication operator by an independent variable in matrix
           Sobolev spaces

    • Free pre-print version: Loading...

      Abstract: Abstract We study the operator \(\mathcal {A}\) of multiplication by an independent variable in a matrix Sobolev space \(W^2(M)\) . In the cases of finite measures on [a, b] with \((2\times 2)\) and \((3\times 3)\) real continuous matrix weights of full rank it is shown that the operator \(\mathcal {A}\) is symmetrizable. Namely, there exist two symmetric operators \(\mathcal {B}\) and \(\mathcal {C}\) in a larger space such that \(\mathcal {A} f = \mathcal {C} \mathcal {B}^{-1} f\) , \(f\in D(\mathcal {A})\) . As a corollary, we obtain some new orthogonality conditions for the associated Sobolev orthogonal polynomials. These conditions involve two symmetric operators in an indefinite metric space.
      PubDate: 2022-09-19
      DOI: 10.1007/s43036-022-00221-1
       
  • An extension of Korovkin theorem via power series method

    • Free pre-print version: Loading...

      Abstract: Abstract In the present work, using the power series method, we obtain various Korovkin-type approximation theorems for linear operators defined on derivatives of functions. We also explain that our theorem makes more sense with a striking example. We study the quantitative estimates of linear operators. In the final section, we summarize our new results.
      PubDate: 2022-09-17
      DOI: 10.1007/s43036-022-00218-w
       
  • Bi-extremity of embeddings of operator spaces into their injective
           envelopes

    • Free pre-print version: Loading...

      Abstract: Abstract In this study of non-commutative convexity in the context of operator spaces, we explore extremal nature of embedding of an operator space in its injective envelope. We introduce the notions of bi-extremity of completely contractive (CC) maps on operator spaces and of prime TROs generated by them in the context of Hilbert \(C^*\) -bimodules. It is shown that if the generated TRO of an operator space is prime, then the CC embedding of the operator space in its injective envelope is bi-extreme.
      PubDate: 2022-09-04
      DOI: 10.1007/s43036-022-00214-0
       
  • Legendre spectral multi-projection methods for Fredholm integral equations
           of the first kind

    • Free pre-print version: Loading...

      Abstract: Abstract We study the solvability and stability of the Tikhonov regularized equation of the Fredholm integral equations of the first kind using Legendre spectral multi-projection method. We discuss the theoretical analysis of this method with the convergence analysis under a priori parameter choice strategy for the Tikhonov regularization using Legendre polynomial basis functions. We obtain the optimal convergence rates in infinity norm. Next, we discuss the Arcangeli’s discrepancy principle to find a suitable regularization parameter and obtain optimal order of convergence in infinity norm. We provide numerical examples to illustrate our theoretical results.
      PubDate: 2022-08-30
      DOI: 10.1007/s43036-022-00215-z
       
  • New upper bounds for the numerical radius of operators on Hilbert spaces

    • Free pre-print version: Loading...

      Abstract: Abstract This article presents some refinements and generalizations of existing numerical radius inequalities for Hilbert space operators. Further, several upper bounds for numerical radius with the Cartesian decomposition of an operator are provided. Also, we prove various upper bounds for the numerical radius of diagonal and off-diagonal operator matrices. Additionally, we establish certain numerical radius inequalities for operators using quadratic weighted operator geometric mean.
      PubDate: 2022-08-29
      DOI: 10.1007/s43036-022-00216-y
       
  • On super-recurrence of strongly continuous semigroup

    • Free pre-print version: Loading...

      Abstract: Abstract In this paper, we study the notion of super-recurrence for a strongly continuous semigroup of operators. We establish some results for super-recurrent \(C_{0}\) -semigroups. As an application, we study the super-recurrence of the translation \(C_{0}\) -semigroup.
      PubDate: 2022-08-26
      DOI: 10.1007/s43036-022-00213-1
       
  • The operator $$\sqrt{-1}\widehat{c}(V)(d+\delta )$$ - 1 c ^ ( V ) ( d + δ
           ) and the Kastler–Kalau–Walze type theorems

    • Free pre-print version: Loading...

      Abstract: Abstract In this paper, we obtain two Lichnerowicz type formulas for the operators \(\sqrt{-1}\widehat{c}(V)(d+\delta )\) and \(-\sqrt{-1}(d+\delta )\widehat{c}(V)\) . And we give the proof of Kastler–Kalau–Walze type theorems for the operators \(\sqrt{-1}\widehat{c}(V)(d+\delta )\) and \(-\sqrt{-1}(d+\delta )\widehat{c}(V)\) on 3,4-dimensional oriented compact manifolds with (resp.without) boundary.
      PubDate: 2022-08-01
      DOI: 10.1007/s43036-022-00211-3
       
 
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