Subjects -> MATHEMATICS (Total: 1013 journals)
    - APPLIED MATHEMATICS (92 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (714 journals)
    - MATHEMATICS (GENERAL) (45 journals)
    - NUMERICAL ANALYSIS (26 journals)
    - 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
Annals of Functional Analysis
Number of Followers: 2  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2639-7390 - ISSN (Online) 2008-8752
Published by Springer-Verlag Homepage  [2467 journals]
  • Biharmonic systems involving a Rellich-type potential and multiple
           critical strongly coupled terms

    • Free pre-print version: Loading...

      Abstract: Abstract In this work, we study the combined effect of concave and convex nonlinearities on the number of solutions for a biharmonic elliptic system involving a Rellich-type potential and multiple critical strongly coupled terms. Using the Nehari manifold and analytic techniques, the system is proved to have at least two nontrivial nonnegative solutions.
      PubDate: 2022-11-27
       
  • K-frames for Krein spaces

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      Abstract: Abstract The aim of this article is to give a definition of K-frames in Krein spaces. This definition is compatible with K-frames already known in Hilbert spaces and it generalizes them. We will characterize the K-frames by the synthesis operator and the frame operator, likewise to what is seen in the case of Hilbert spaces. In the rest of the article, we will set a definition of dual sequences and some results concerning this notion. Finally, we will demonstrate how to transfer K-frames for Hilbert spaces to Krein spaces arising from a possibly non-regular Gram operator.
      PubDate: 2022-11-22
       
  • On the eigenfunctions of the q-Bernstein operators

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      Abstract: Abstract The eigenvalue problems for linear operators emerge in various practical applications in physics and engineering. This paper deals with the eigenvalue problems for the q-Bernstein operators, which play an important role in the q-boson theory of modern theoretical physics. The eigenstructure of the classical Bernstein operators was investigated in detail by S. Cooper and S. Waldron back in 2000. Some of their results were extended for other Bernstein-type operators, including the q-Bernstein and the limit q-Bernstein operators. The current study is a pursuit of this research. The aim of the present work is twofold. First, to derive for the q-Bernstein polynomials analogues of the Cooper–Waldron results on zeroes of the eigenfunctions. Next, to present in detail the proof concerning the existence of non-polynomial eigenfunctions for the limit q-Bernstein operator.
      PubDate: 2022-11-19
       
  • Square root problem and subnormal Aluthge transforms

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      Abstract: Abstract For a non-negative measure \(\mu\) with p atoms, we study the relation between the Square Root Problem of \(\mu\) and the problem of subnormality of \({{\tilde{W}}_\mu }\) the Aluthge transform of the associated unilateral weighted shift. We use an approach based on uniquely represented elements in the support of \(\mu *\mu\) . We first show that if \({{\tilde{W}}_\mu }\) is subnormal, then \(2p-1\le card(supp(\mu *\mu ))\le [\frac{(p-1)^2+6}{2}]\) . We rewrite several results known for finitely atomic measure having at most five atoms and give a complete solution for measures six atoms.
      PubDate: 2022-11-18
       
  • Singular value inequalities for convex functions of positive semidefinite
           matrices

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      Abstract: Abstract In this paper, we give new singular value inequalities for matrices. It is shown that if A, B, X are \(n\times n\) matrices such that X is positive semidefinite, and if \(f:[0,\infty )\rightarrow {\mathbb {R}} \) is an increasing nonnegative convex function, then $$\begin{aligned} s_{j}\left( f\left( \frac{\left AXB^{*}\right }{\left\ X\right\ }\right) \right) \le \frac{\left\ f\left( \frac{A^{*}A+B^{*}B}{2}\right) \right\ }{\left\ X\right\ }s_{j}\left( X\right) \end{aligned}$$ and $$\begin{aligned} s_{j}\left( AXB^{*}\right) \le \frac{1}{2}\left\ \frac{A^{*}A}{ \left\ A\right\ ^{2}}+\frac{B^{*}B}{\left\ B\right\ ^{2}} \right\ \left\ A\right\ \left\ B\right\ s_{j}\left( X\right) \end{aligned}$$ for \(j=1,2,...,n\) . Some of our inequalities present refinements of some known singular value inequalities.
      PubDate: 2022-11-18
       
  • Generalization of some commutative perturbation results

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      Abstract: Abstract We study the stability of certain spectra under some algebraic conditions weaker than the commutativity and we generalize many known commutative perturbation results. In particular, in a complex unital Banach algebra \(\mathcal {A},\) we prove that if \(x \in \hbox {comm}_{w}(a)\) and a is nilpotent, then \(\sigma (x)=\sigma (x+a).\) Among other things, we prove that if \(x \in \hbox {comm}(xy)\cup \hbox {comm}(yx)\) or \(y\in \hbox {comm}(yx)\) for all \(x,y \in \mathcal {A},\) then \(\mathcal {A}\) is commutative. When \(\mathcal {A}=L(X)\) is the unital complex Banach algebra of bounded linear operators acting on the complex Banach space X,  then \(\sigma _{p}(T){{\setminus }}\{0\}\subset \sigma _{p}(T+N){\setminus }\{0\},\) where N is nilpotent and \(T\in \hbox {comm}(NT).\)
      PubDate: 2022-11-17
       
  • Solvability and different solutions of the operator equation $$XAX=BX$$

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      Abstract: Abstract In this paper, we present certain necessary and sufficient conditions for the existence of a nonzero solution of the operator equation \(XAX=BX.\) We present the general form of the solution and describe all cases when this equation has infinitely many solutions as well as when all the solutions are idempotent. We generalize the existing particular results that concern this equation in the special cases when \(A=B\) or \(A*\le B.\) Furthermore, we derive two possible representations of an arbitrary solution as a \(2\times 2\) operator matrix which allows us to discuss the existence of an invertible and a positive solution, but also to open the discussion to the existence of any type of solutions using related results for \(2\times 2\) operator matrices. Also, we consider the operator equation \(XAX=AX,\) which is closely related to the “invariant subspace problem” and describe the set of all right(left) invertible and all Fredholm solutions.
      PubDate: 2022-11-09
       
  • Necessary and sufficient conditions of entire subsolutions to
           Monge–Ampère type equations

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      Abstract: Abstract The primary objective of this article is to investigate the Monge–Ampère type equation \(\text {det}^{\frac{1}{n}}(D^2u+A(x,u,Du))=f(u)\) in \({\mathbb {R}}^n\) . Among others, the necessary and sufficient condition on f for the existence of entire subsolutions is established. This is probably the first time the necessary and sufficient conditions for the existence of entire subsolutions of Monge–Ampère type equations with A depending on Du has been studied.
      PubDate: 2022-11-04
       
  • Spectrum and global bifurcation results for nonlinear second-order problem
           on all of $${\mathbb {R}}$$

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      Abstract: Abstract We investigate the following second-order problem $$\begin{aligned} \left\{ \begin{array}{ll} -u''(t) +a(t)u(t)=\lambda b(t)f(u(t)), \ \ \ \ t\in {\mathbb {R}}, \qquad \qquad \qquad \qquad (P) \\ \underset{ t \rightarrow \infty }{\lim }u(t)=0, \end{array} \right. \end{aligned}$$ where \(\lambda >0\) is a parameter, \(a \in C({\mathbb {R}}, (0,\infty )),~b\in C({\mathbb {R}}, [0,\infty ))\) such that \(\underset{ t \rightarrow \infty }{\lim }\frac{b(t)}{a(t)} = 0, ~f:{\mathbb {R}}\rightarrow {\mathbb {R}}\) is a continuous function with \(sf(s)> 0\) for \(s\ne 0\) . For the linear case, i.e., \(f(u)=u\) , we investigate the existence of principal eigenvalue of (P). For the nonlinear case, depending on the behavior of f near 0 and \(\infty\) , we obtain asymptotic behavior and the existence of homoclinic solutions of (P). The proof of our main results is based upon bifurcation technique.
      PubDate: 2022-11-03
       
  • Compact intertwining relation for multiplication operators in several
           complex variables

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      Abstract: Abstract We study the compact intertwining relations for the multiplication operators between Hardy spaces and Bergman spaces in the unit ball of \({\mathbb{C}}^n.\)
      PubDate: 2022-10-26
       
  • Publisher Correction: Grand martingale Hardy spaces for
           0 < p ≤ 1

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      PubDate: 2022-10-21
       
  • On weighted boundedness and compactness of operators generated by
           fractional heat semigroups related with Schrödinger operators

    • Free pre-print version: Loading...

      Abstract: Abstract Let \(L=-\Delta +V\) be a Schrödinger operator with the potential V belonging to the reverse Hölder class \(B_{q}, q>n/2\) . Denote by \(\mathrm{CMO}_{\theta }(\rho )\) the vanishing mean oscillation type space associated with L. By the aid of the regularity estimates of the fractional heat kernel related with L, we investigate the weighted boundedness and compactness of the commutators of operators generated by fractional heat semigroups related to L and functions belonging to \(\mathrm{CMO}_{\theta }(\rho )\) .
      PubDate: 2022-10-16
       
  • Projective limits of generalized scales of Banach spaces and applications

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      Abstract: Abstract In this paper we introduce the notion of generalized scale of Banach spaces. The spaces of a generalized scale of Banach spaces define a projective limit space denoted by \({\mathcal {X}}_{\Delta }\) . In that space we will define a class of operators based on the degree of nondensifiability. Such operators will be called DND-condensing operators. It is shown that these operators have a fixed point in \({\mathcal {X}}_{\Delta }\) . In this manner we obtain another method for the theory of fixed point that joins the already existing one of measures of noncompactness. Some applications of the DND-condensing operator method will be illustrated.
      PubDate: 2022-10-15
       
  • Skewness of Day–James spaces

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      Abstract: Abstract The skewness of Banach spaces was introduced by Fitzpatrick–Reznick. In this paper, we compute the skewness \(s(\ell _p-\ell _1)\) of Day–James spaces \(\ell _p-\ell _1\) , where \(1< p < \infty\) . This gives that the inequality \(s(X)\le 2 \rho _X(1)\) is strict for such space X, where \(\rho _X\) is the modulus of smoothness of X.
      PubDate: 2022-10-13
       
  • The ideal of operators factored through a Banach space with a basis

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      Abstract: Abstract Let E be a Banach space with a Schauder basis. We investigate E-factorable operators and their operator ideals. Some characterizations of E-factorable operators are established and we show that some collections of E-factorable operators can be (quasi) Banach operator ideals. Also, we represent the surjective hull and the injective hull of the quasi normed operator ideal of E-factorable operators.
      PubDate: 2022-10-10
       
  • The $$\hbox {C}^*$$ -algebra index for observable algebra in
           non-equilibrium Hopf spin models

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      Abstract: Abstract Denote by H a finite dimensional Hopf \(\hbox {C}^*\) -algebra, K a Hopf \(*\) -subalgebra of H. Starting with the observable algebra \({\mathscr {A}}_{K}\) in non-equilibrium Hopf spin models, in which \({\mathscr {A}}_{K}\) carries a coaction of relative quantum double D(H, K), the field algebra \({\mathscr {F}}_{K}={\mathscr {A}}_{K} \rtimes \widehat{D(H,K)}\) is obtained, where \(\widehat{D(H,K)}\) is the dual of D(H, K). This paper shows that the Haar integral of D(H, K) admits a faithful conditional expectation \(\varGamma\) from \({\mathscr {F}}_{K}\) onto \({\mathscr {A}}_{K}\) . The index of \(\varGamma\) is calculated by virtue of its quasi-basis provided by the matrix units of \(\widehat{D(H,K)}\) .
      PubDate: 2022-10-04
       
  • Parametrized Littlewood–Paley operators on grand variable Herz
           spaces

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      Abstract: Abstract We prove the boundedness of parametrized area integral \(\mu ^{\varrho }_S\) and Littlewood–Paley’s \(g^*_\lambda\) -function \(\mu ^{*, \varrho }_\lambda\) on grand variable Herz spaces \(\dot{K}_{q(\cdot )}^{\alpha (\cdot ), p),\theta }({\mathbb {R}}^n)\) , where the two main indices \(\alpha\) and q are variable exponents. Furthermore, the boundedness of their higher order commutators \([b^m, \mu ^{\varrho }_S]\) and \([b^m, \mu ^{*, \varrho }_\lambda ]\) with \(\mathrm {BMO}\) functions are also established on these spaces. Our results are still new even when \(m=1\) and \(\alpha (\cdot )\equiv \alpha\) is constant.
      PubDate: 2022-10-02
       
  • Hyperinvariant subspaces for sets of polynomially compact operators

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      Abstract: Abstract We prove the existence of a non-trivial hyperinvariant subspace for several sets of polynomially compact operators. The main results of the paper are: (i) a non-trivial norm closed algebra \(\mathcal {A}\subseteq \mathcal {B}(\mathscr {X})\) which consists of polynomially compact quasinilpotent operators has a non-trivial hyperinvariant subspace; (ii) if there exists a non-zero compact operator in the norm closure of the algebra generated by an operator band \(\mathcal {S}\) , then \(\mathcal {S}\) has a non-trivial hyperinvariant subspace.
      PubDate: 2022-09-29
       
  • Bergman projections on weighted mixed norm spaces and duality

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      Abstract: Abstract We prove that the weighted Bergman projection \(P_\gamma \) is a bounded operator on the weighted Lebesgue space \(L^p(\Omega , r(x)^\lambda \mathrm{{d}}m(x))\) for a certain range of parameters p, \(\gamma \) and \(\lambda \) . Here \(\Omega \) is a bounded domain in \(\mathbb R^n\) with smooth boundary. This result is used to prove boundedness of \(P_\gamma \) acting on weighted mixed norm space \(L^{p,q}_\alpha (\Omega )\) , again assuming certain conditions on the parameters. We describe the dual of harmonic mixed norm space \(B^{p,q}_\alpha (\Omega )\) for a certain range of parameters.
      PubDate: 2022-09-28
       
  • A family of weighted operator means including the weighted Heinz and
           Lehmer means

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      Abstract: Abstract Recently, we proposed the notion of a transpose symmetric path of weighted \({\mathfrak{M}}\) -means for a symmetric operator mean \({\mathfrak{M}},\) and also we obtained a family of operator means including the weighted Heron, logarithmic and Heinz means. On the other hand, Kubo, Nakamura, Ohno and Wada discussed a path of operator monotone functions named the Barbour path. In this paper, based on our former results and the Barbour path, we introduce new families of weighted operator means. One of them provides the relations among the weighted Heinz, Lehmer and some fundamental means.
      PubDate: 2022-09-28
       
 
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