Subjects -> MATHEMATICS (Total: 1118 journals)
    - APPLIED MATHEMATICS (92 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (819 journals)
    - MATHEMATICS (GENERAL) (45 journals)
    - NUMERICAL ANALYSIS (26 journals)
    - PROBABILITIES AND MATH STATISTICS (113 journals)

MATHEMATICS (819 journals)                  1 2 3 4 5 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 5)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 3)
Accounting Perspectives     Full-text available via subscription   (Followers: 9)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 17)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 5)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 9)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 44)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 2)
Acta Mathematica     Hybrid Journal   (Followers: 11)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 13)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 8)
Advances in Complex Systems     Hybrid Journal   (Followers: 12)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 23)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 5)
Advances in Fixed Point Theory     Open Access   (Followers: 9)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 22)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 10)
Advances in Materials Science     Open Access   (Followers: 22)
Advances in Mathematical Physics     Open Access   (Followers: 10)
Advances in Mathematics     Full-text available via subscription   (Followers: 22)
Advances in Numerical Analysis     Open Access   (Followers: 8)
Advances in Operations Research     Open Access   (Followers: 14)
Advances in Operator Theory     Hybrid Journal   (Followers: 4)
Advances in Porous Media     Full-text available via subscription   (Followers: 6)
Advances in Pure Mathematics     Open Access   (Followers: 11)
Advances in Science and Research (ASR)     Open Access   (Followers: 8)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 12)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 7)
Afrika Matematika     Hybrid Journal   (Followers: 3)
Air, Soil & Water Research     Open Access   (Followers: 13)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 4)
AKSIOMATIK : Jurnal Penelitian Pendidikan dan Pembelajaran Matematika     Open Access   (Followers: 1)
Al-Jabar : Jurnal Pendidikan Matematika     Open Access   (Followers: 1)
Al-Qadisiyah Journal for Computer Science and Mathematics     Open Access   (Followers: 1)
AL-Rafidain Journal of Computer Sciences and Mathematics     Open Access   (Followers: 6)
Algebra and Logic     Hybrid Journal   (Followers: 8)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Open Access   (Followers: 5)
Algorithms     Open Access   (Followers: 14)
Algorithms Research     Open Access   (Followers: 2)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 10)
American Journal of Mathematical Analysis     Open Access   (Followers: 2)
American Journal of Mathematical and Management Sciences     Hybrid Journal   (Followers: 1)
American Journal of Mathematics     Full-text available via subscription   (Followers: 9)
American Journal of Operations Research     Open Access   (Followers: 8)
American Mathematical Monthly     Full-text available via subscription   (Followers: 7)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 13)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access  
Analysis and Applications     Hybrid Journal   (Followers: 2)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 10)
Analysis Mathematica     Full-text available via subscription  
Anargya : Jurnal Ilmiah Pendidikan Matematika     Open Access   (Followers: 8)
Annales Mathematicae Silesianae     Open Access   (Followers: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
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: 17)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 8)
Annals of Functional Analysis     Hybrid Journal   (Followers: 4)
Annals of Mathematics     Full-text available via subscription   (Followers: 4)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 16)
Annals of PDE     Hybrid Journal  
Annals of Pure and Applied Logic     Open Access   (Followers: 6)
Annals of the Alexandru Ioan Cuza University - Mathematics     Open Access  
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: 2)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applications of Mathematics     Hybrid Journal   (Followers: 3)
Applied Categorical Structures     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Mathematics     Open Access   (Followers: 10)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 13)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal   (Followers: 2)
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: 2)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 6)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 4)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 4)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Armenian Journal of Mathematics     Open Access   (Followers: 1)
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites     Open Access   (Followers: 24)
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: 4)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 7)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 2)
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   (Followers: 1)
Basin Research     Hybrid Journal   (Followers: 6)
BIBECHANA     Open Access   (Followers: 2)
Biomath     Open Access  
BIT Numerical Mathematics     Hybrid Journal   (Followers: 1)
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   (Followers: 3)
British Journal for the History of Mathematics     Hybrid Journal  
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 20)
Bruno Pini Mathematical Analysis Seminar     Open Access  
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 15)
Bulletin des Sciences Mathamatiques     Full-text available via subscription   (Followers: 4)
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: 3)
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   (Followers: 2)
Calculus of Variations and Partial Differential Equations     Hybrid Journal  
Canadian Journal of Mathematics / Journal canadien de mathématiques     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 23)
Canadian Mathematical Bulletin     Hybrid Journal  
Carpathian Mathematical Publications     Open Access   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 6)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
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: 3)
Chinese Journal of Mathematics     Open Access  
Ciencia     Open Access   (Followers: 1)
CODEE Journal     Open Access   (Followers: 2)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 17)
Commentarii Mathematici Helvetici     Hybrid Journal  
Communications in Advanced Mathematical Sciences     Open Access  
Communications in Combinatorics and Optimization     Open Access  
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 4)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 5)
Complex Analysis and its Synergies     Open Access   (Followers: 3)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Composite Materials Series     Full-text available via subscription   (Followers: 11)
Compositio Mathematica     Full-text available via subscription  
Comptes Rendus : Mathematique     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 4)
Computational and Mathematical Methods     Hybrid Journal  
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 3)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 1)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 9)
Computational Mechanics     Hybrid Journal   (Followers: 10)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 11)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 11)
Confluentes Mathematici     Hybrid Journal  
Constructive Mathematical Analysis     Open Access   (Followers: 1)
Contributions to Discrete Mathematics     Open Access   (Followers: 1)
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal   (Followers: 1)
Cryptography and Communications     Hybrid Journal   (Followers: 14)
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   (Followers: 1)
Daya Matematis : Jurnal Inovasi Pendidikan Matematika     Open Access   (Followers: 1)
Demographic Research     Open Access   (Followers: 16)
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 35)
Desimal : Jurnal Matematika     Open Access   (Followers: 3)
Developments in Clay Science     Full-text available via subscription   (Followers: 1)
Developments in Mineral Processing     Full-text available via subscription   (Followers: 3)
Dhaka University Journal of Science     Open Access  
Differential Equations and Dynamical Systems     Hybrid Journal   (Followers: 4)

        1 2 3 4 5 | Last

Similar Journals
Journal Cover
Advances in Operator Theory
Number of Followers: 4  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2662-2009 - ISSN (Online) 2538-225X
Published by Springer-Verlag Homepage  [2658 journals]
  • The semicircular law of free probability as noncommutative multivariable
           operator theory

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      Abstract: Abstract In this paper, we study semicircular elements induced by connected finite directed graphs. It is shown that if the graph groupoid \(\mathbb {G}\) of a given graph G contains at least one loop finite path, then it induces a semicircular element under suitable representations of \(\mathbb {G}\) . As application, if a graph G is fractal (or, satisfies the fractal property) in a certain sense, then it automatically generates infinitely many semicircular elements.
      PubDate: 2021-10-14
       
  • Multiresolution analysis for linear canonical S transform

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      Abstract: Abstract To deal with the time-varying signals, linear canonical S transform (LCST) is introduced to possess some desirable characteristics that are absent in conventional time–frequency transforms. Inspired by LCST, we in this paper developed an idea of novel MRA associated with LCST. Moreover, the construction method of orthogonal wavelets is developed. Finally an example is provided to justify the results.
      PubDate: 2021-10-04
       
  • Lipschitz p-lattice summing operators

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      Abstract: Abstract In this paper, we introduce and study the notion of Lipschitz p-lattice summing operators in the category of Lipschitz operators which generalizes the class of p-lattice summing operators in the linear case. Some interesting properties are given. Also, some connections with other classes of operators are presented.
      PubDate: 2021-09-27
       
  • Analogue of slant Hankel operators on the Lebesgue space of n-torus

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      Abstract: Abstract In this paper, the multivariate analogue of slant Hankel operator on \(L^2(\mathbb {T}^n)\) , ( \(n\ge 1\) , a natural number), the Lebesgue space of square integrable functions defined on \(\mathbb {T}^n\) , where \(\mathbb {T}\) is the unit circle, is introduced. Various characterizations are obtained for a bounded operator on \(L^2(\mathbb {T}^n)\)   to be a kth- order slant Hankel operator  ( \(k\ge 2\) , a fixed integer).
      PubDate: 2021-09-07
       
  • Fractional Sobolev space with Riemann–Liouville fractional derivative
           and application to a fractional concave–convex problem

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      Abstract: Abstract A new fractional function space \(E_{L}^{\alpha }[a,b]\) with Riemann–Liouville fractional derivative and its related properties are established in this paper. Under this configuration, the following fractional concave–convex problem: 0.1 $$\begin{aligned} \begin{aligned}&{_{x}}D_{b}^{\alpha }({_{a}}D_{x}^{\alpha }u) = \lambda u^\sigma + u^p,\;\;\text{ in }\;\;(a,b)\\&B_{\alpha }(u)=0,\;\;\text{ in }\;\;\partial (a,b) \end{aligned} \end{aligned}$$ where \(\alpha \in (0,1)\) , \(\sigma \in (0,1)\) and \(p\in (1, \frac{1+ 2\alpha }{1-2\alpha })\) if \(\alpha \in (0, \frac{1}{2})\) and \(p\in (1, +\infty )\) if \(\alpha \in (\frac{1}{2}, 1)\) . \(B_\alpha (u)\) represent the boundary condition of the problem which depend of the behavior of \(\alpha \in (0,1)\) , that is: $$\begin{aligned} B_\alpha (u) = {\left\{ \begin{array}{ll} \lim _{x\rightarrow a^+}{_{a}}I_{x}^{1-\alpha }u(x) = 0,&{}\hbox { if}\ \alpha \in \left(0, \frac{1}{2}\right)\\ u(a) = u(b) = 0,&{}\hbox { if}\ \alpha \in \left(\frac{1}{2}, 1\right). \end{array}\right. } \end{aligned}$$ By using Ekeland’s variational principle and mountain pass theorem we show that the problem (0.1) at less has two nontrivial weak solutions.
      PubDate: 2021-08-17
       
  • Singular value and unitarily invariant norm inequalities for sums and
           products of operators

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      Abstract: Abstract In this note, we mainly investigate singular value and unitarily invariant norm inequalities for sums and products of operators. First, we present singular value inequality for the quantity \(AX+YB\) : let A, B, X and \(Y \in B({\mathcal {H}})\) such that both A and B are positive operators. Then $$\begin{aligned} s_{j}\left( (AX+YB)\oplus 0\right) \le s_{j}\left( (K+M)\oplus (L_{ 1} + N)\right) , \end{aligned}$$ for \(j = 1,2,\ldots \) , where \(K=\frac{1}{2}A+\frac{1}{2}A^{\frac{1}{2}} X^{*} ^{2}A^{\frac{1}{2}}\) , \( L_{1}=\frac{1}{2}B+\frac{1}{2}B^{\frac{1}{2}} Y ^{2}B^{\frac{1}{2}}\) , \(M=\frac{1}{2} B^{\frac{1}{2}}(X+Y)^{*}A^{\frac{1}{2}} \) and \(N=\frac{1}{2} A^{\frac{1}{2}}(X+Y)B^{\frac{1}{2}} \) . In addition, based on the above singular value inequality, we establish a unitarily invariant norm inequality for concave functions. These results generalize inequalities obtained by Audeh directly. Finally, we present another more general singular value inequality for \(\sum \nolimits _{i=1}^{m}A_{i}^{*}X_{i}^{*}B_{i}\) : $$\begin{aligned} s_{j}\left( \sum \limits _{i=1}^{m}A_{i}^{*}X_{i}^{*}B_{i}\oplus 0\right) \le s_{j} \left( \left( \sum \limits _{i=1}^{m}A_{i}^{*}f_{i}^{2}( X_{i} )A_{i}\right) \oplus \left( \sum \limits _{i=1}^{m}B_{i}^{*}g_{i}^{2}( X_{i}^{*} )B_{i}\right) \right) , \end{aligned}$$ for \(j=1,2,\ldots \) , where \(A_{i}\) , \(B_{i}\) and \(X_{i}\in B({\mathcal {H}})\) such that \(A_{i}\) and \(B_{i}\) ( \(i=1,2,\ldots ,m\) ) are compact operators and \(f_{i}\) , \(g_{i}\) ( \(i=1,2,\ldots ,m\) ) are 2m nonnegative continuous functions on \([0,+\infty )\) with \(f_{i}(t)g_{i}(t)=t\) ( \(i=1,2,\ldots ,m\) ) for \(t\in [0,+\infty )\) .
      PubDate: 2021-08-11
       
  • A caricature of dilation theory

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      Abstract: Abstract We present a set-theoretic version of some basic dilation results of operator theory. The results we have considered are Wold decomposition, Halmos dilation, Sz. Nagy dilation, inter-twining lifting, commuting and non-commuting dilations, BCL theorem, etc. We point out some natural generalizations and variations.
      PubDate: 2021-08-05
       
  • On extension of Beurling–Helson–Lowdenslager theorem

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      Abstract: Abstract In this paper, we prove an extension of the Helson–Lowdenslager theorem for \(\mathcal {L}^2(\mathbb {T})\) for sub - Hilbert spaces under certain axioms. Furthermore, we provide an alternate proof of characterization of shift invariant sub-Hilbert spaces contained in \(\mathcal {H}^2(\mathbb {D})\) satisfying similar axioms.
      PubDate: 2021-07-29
       
  • Inertial extragradient algorithms with non-monotonic step sizes for
           solving variational inequalities and fixed point problems

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      Abstract: Abstract In this paper, we introduce four inertial extragradient algorithms with non-monotonic step sizes to find the solution of the convex feasibility problem, which consists of a monotone variational inequality problem and a fixed point problem with a demicontractive mapping. Strong convergence theorems of the suggested algorithms are established under some standard conditions. Finally, we implement some computational tests to show the efficiency and advantages of the proposed algorithms and compare them with some existing ones.
      PubDate: 2021-07-19
       
  • Analytic functional calculus for two operators

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      Abstract: Abstract This paper is a survey devoted to the transformations $$\begin{aligned} C&\mapsto \frac{1}{(2\pi i)^2}\int _{\Gamma _1}\int _{\Gamma _2}f(\lambda ,\mu )\,R_{1,\,\lambda }\,C\, R_{2,\,\mu }\,{\mathrm{d}}\mu \,{\mathrm{d}}\lambda ,\\ C&\mapsto \frac{1}{2\pi i}\int _{\Gamma }g(\lambda )R_{1,\,\lambda }\,C\, R_{2,\,\lambda }\,{\mathrm{d}}\lambda , \end{aligned}$$ where \(R_{1,\,(\cdot )}\) and \(R_{2,\,(\cdot )}\) are pseudo-resolvents acting in a Banach space, i. e., the resolvents of bounded, unbounded, or multivalued linear operators, and f and g are analytic functions; here \(\Gamma _1\) , \(\Gamma _2\) , and \(\Gamma\) surround the singular sets (spectra) of the pseudo-resolvents \(R_{1,\,(\cdot )}\) , \(R_{2,\,(\cdot )}\) , and the both, respectively. Several applications are considered: a representation of the impulse response of a second-order linear differential equation with operator coefficients, a representation of the solution of the Sylvester equation, and properties of the differential of the ordinary functional calculus.
      PubDate: 2021-07-19
       
  • Rough Hausdorff operator and its commutators on the Heisenberg group

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      Abstract: Abstract In this paper, we discuss some sufficient conditions for the boundedness of rough Hausdorff operators on the central Morrey and Herz spaces with the Muckenhoupt weights on the Heisenberg group. The boundedness for the commutators of rough Hausdorff operators with symbols in weighted CMO space on such spaces is given as well.
      PubDate: 2021-07-07
       
  • Multipliers of double Fourier–Haar series

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      Abstract: Abstract The multipliers of double Fourier–Haar series for functions from anisotropic Lorentz spaces are investigated. Necessary and sufficient conditions are obtained for the sequence \(\lambda =\{\lambda _{k_1k_2}^{j_1j_2}\}\) to belong to the class \(m(L_{\bar{p},\bar{r}}\rightarrow L_{\bar{q},\bar{s}})\) . In particular, the case is described when \(\bar{s}<\bar{r}\) , which is a new result in the one-dimensional case as well.
      PubDate: 2021-07-06
       
  • Weighted laws of large numbers and convergence of weighted ergodic
           averages on vector valued $$L_p$$ L p -spaces

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      Abstract: Abstract A more general notion of weight called admissible is introduced and then an investigation is carried out on the a.e. convergence of weighted strong laws of large numbers and their applications to weighted ergodic averages on vector-valued \(L_p\) -spaces.
      PubDate: 2021-07-05
       
  • Weighted variable Hardy spaces on domains

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      Abstract: Abstract In this paper, we introduce and study the weighted variable Hardy space on domains. We prove the atomic decompositions of this space, and as application, we figure out its dual space.
      PubDate: 2021-06-24
       
  • Explicit formula for MRA-wavelets on local fields

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      Abstract: Abstract We provide an explicit formula for the wavelets associated with a multiresolution analysis of \(L^2(K)\) , where K is a local field of positive characteristic. We also give several examples to illustrate this result.
      PubDate: 2021-06-17
       
  • Generalised nonlinear Picone identities for p-sub-Laplacians and
           p-biharmonic operators and applications

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      Abstract: Abstract In this paper, we establish generalised nonlinear Picone identities for p-sub-Laplacians, anisotropic p-sub-Laplacians and p-biharmonic operators on general stratified Lie groups. Moreover, we give applications to horizontal Hardy inequalities, Sturmian comparison principles as well as to weighted eigenvalue problems for p-sub-Laplacian and p-biharmonic operators.
      PubDate: 2021-06-14
       
  • The Kachurovskij spectrum of Lipschitz continuous nonlinear block operator
           matrices

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      Abstract: Abstract In this paper, the Kachurovskij spectrum of \(2\times 2\) Lipschitz continuous nonlinear operator matrices are studied. Firstly, some connections between the Kachurovskij spectrum of certain \(2\times 2\) Lipschitz continuous nonlinear operator matrices and that of their entries are established, and the relationship between the Kachurovskij spectrum of \(2\times 2\) Lipschitz continuous nonlinear operator matrices and that of their Schur complement is presented by means of Schur decomposition. Then, the Gershgorin’s theorem of \(2\times 2\) Lipschitz continuous nonlinear operator matrices is given, and the spectral inclusion properties of Lipschitz continuous nonlinear block operator matrices are investigated by using the numerical range of diagonal entries. Finally, the lipeomorphism of certain \(2\times 2\) Lipschitz continuous nonlinear operator matrices is characterized by using the perturbation theory of nonlinear operators.
      PubDate: 2021-06-14
       
  • Completely order bounded maps on non-commutative $${\varvec{L_p}}$$ L p
           -spaces

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      Abstract: Abstract We define norms on \(L_p({\mathcal {M}}) \otimes M_n\) where \({\mathcal {M}}\) is a von Neumann algebra and \(M_n\) is the space of complex \(n \times n\) matrices. We show that a linear map \(T: L_p({\mathcal {M}}) \rightarrow L_q({\mathcal {N}})\) is decomposable if \({\mathcal {N}}\) is an injective von Neumann algebra, the maps \(T \otimes Id_{M_n}\) have a common upper bound with respect to our defined norms, and \(p = \infty \) or \(q = 1\) . For \(2p< q < \infty \) we give an example of a map \(T\) with uniformly bounded maps \(T \otimes Id_{M_n}\) which is not decomposable.
      PubDate: 2021-06-08
       
  • Sums of weighted differentiation composition operators from weighted
           Bergman spaces to weighted Zygmund and Bloch-type spaces

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      Abstract: Abstract Let \({\mathcal {H}}({\mathbb {D}})\) be the space of analytic functions on the unit disc \({\mathbb {D}}\) and let \({\mathcal {S}}({\mathbb {D}})\) denote the set of all analytic self maps of the unit disc \({\mathbb {D}}\) . Let \(\Psi =(\psi _j)_{j=0}^k\) be such that \(\psi _j\in {\mathcal {H}}({\mathbb {D}})\) and \(\varphi \in {\mathcal {S}}({\mathbb {D}})\) . To treat the Stević–Sharma type operators and the products of composition operators, multiplication operators, differentiation operators in a unified manner, Wang et al. considered the following sum operator: $$\begin{aligned} T_{\Psi ,\varphi }^kf= \sum \limits _{j=0}^k\psi _j\cdot f^{(j)}\circ \varphi = \sum \limits _{j=0}^k{\mathfrak {D}}_{\psi _j,\varphi }^jf, \quad f\in {\mathcal {H}}({\mathbb {D}}). \end{aligned}$$ We characterize the boundedness and compactness of the operators \(T_{\Psi ,\varphi }^k\) from the weighted Bergman spaces \(A_{v,p}\) to the weighted Zygmund-type spaces \({\mathcal {Z}}_w\) and the weighted Bloch-type spaces \({\mathcal {B}}_w\) . Besides, giving examples of bounded, unbounded, compact and non-compact operators \(T_{\Psi ,\varphi }^k\) , we give an example of two unbounded weighted differentiation composition operators \({\mathfrak {D}}_{\psi _0,\varphi }^0, \ {\mathfrak {D}}_{\psi _1,\varphi }^1:A_{v,p}\longrightarrow {\mathcal {Z}}_w( {\mathcal {B}}_w)\) such that their sum operator \({\mathfrak {D}}_{\psi _0,\varphi }^0+ {\mathfrak {D}}_{\psi _1,\varphi }^1= T_{\Psi ,\varphi }^1:A_{v,p}\longrightarrow {\mathcal {Z}}_w( {\mathcal {B}}_w)\) is bounded.
      PubDate: 2021-06-02
       
  • Existence results of renormalized solutions for nonlinear $$p(\cdot )$$ p
           ( · ) -parabolic equations with possibly singular measure data

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      Abstract: Abstract We study the existence of renormalized solutions to a nonlinear parabolic boundary value problem with a general and possibly singular measure data, whose model is $$\begin{aligned} ({\mathcal {P}})\ {\left\{ \begin{array}{ll} \frac{\partial b(u)}{\partial t} -\Delta _{p(x)}u =\mu &{}\ \ \text{ in }\ Q:=\Omega \times (0,T), \\ b(u)(t=0)=b(u_{0})(x) &{}\ \ \text{ in }\ \Omega ,\\ u(x,t)=0 &{}\ \ \text{ on }\ \partial \Omega \times (0,T),\\ \end{array}\right. } \end{aligned}$$ where \(\Omega\) is an open bounded subset of \({\mathbb {R}}^{N}\) ( \(N\ge 2\) ), \(T>0\) , b is an increasing \(C^{1}\) -function, \(\Delta _{p(x)}u:=\text {div}( \nabla u ^{p(x)-2}\nabla u)\) ( \(1<p_{-}\le p(x)\le p_{+}<N\) ) is the p(x)-Laplacian operator which, roughly speaking, behaves as \( \nabla u ^{p(x)-1}\) , \(\mu\) is a bounded Radon measure with bounded total variation on Q and \(b(u_{0})\) is an integrable function. We provide the assumptions, the notions of solution we are adopting and the statements of the existence result in the “generalized” Sobolev spaces with variable exponent using some “specific” decompositions on the data.
      PubDate: 2021-06-01
       
 
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