Subjects -> MATHEMATICS (Total: 1013 journals)
    - APPLIED MATHEMATICS (92 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (714 journals)
    - MATHEMATICS (GENERAL) (45 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: 3)
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
Banach Journal of Mathematical Analysis
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2662-2033 - ISSN (Online) 1735-8787
Published by Springer-Verlag Homepage  [2467 journals]
  • Orbit method and dual topology for certain Lie groups

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      Abstract: Abstract Let \({\mathbb {H}}_d\) ( \(d\in {\mathbb {N}}^*\) ) be the \((2d+1)\) -dimensional Heisenberg group and let K be a compact connected subgroup of \(\text{Aut}({\mathbb {H}}_d)\) acting in the usual way on \({\mathbb {H}}_d.\) In this work, we define the semidirect product \(G\,{:}{=}\,K\ltimes {\mathbb {H}}_d,\) for which \((K,{\mathbb {H}}_d)\) is a Gelfand pair. It is well-known in the representation theory of Lie groups (theory of orbit method) that the unitary dual \({\widehat{G}}\) of G is in one to one correspondence with the space of admissible coadjoint orbits \({\mathfrak {g}}^\ddagger /G\) (see, [19]).  The aim of this paper, is to give a nice description of the topology of \({\mathfrak {g}}^\ddagger /G\) and we show that the dual topology of G could be read from the quotient topology of \({\mathfrak {g}}^\ddagger /G.\) More precisely, we prove that the Kirillov–Lipsman’s (orbit mapping) bijection $$\begin{aligned} {\widehat{G}} \simeq {\mathfrak {g}}^\ddagger /G \end{aligned}$$ is a homeomorphism. This is a generalization of the previous result obtained in [12].
      PubDate: 2022-11-15
       
  • Relatively compact sets of Banach space-valued bounded-variation spaces

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      Abstract: Abstract In this paper, we give criteria for the relatively compact sets of Banach space-valued bounded-variation spaces in the sense of Jordan and Banach space-valued bounded Wiener p-variation spaces as \(p\in (0,1)\) . Then, we give sufficient conditions for the relatively compact sets of others Banach space-valued bounded variation spaces, such as Banach space-valued bounded Wiener p-variation spaces as \(p\in (1,\infty )\) , Banach space-valued bounded Wiener–Young variation spaces, Banach space-valued bounded Schramm variation spaces, Banach space-valued bounded Waterman variation spaces, Banach space-valued bounded Riesz variation spaces, and Banach space-valued bounded Korenblum variation spaces.
      PubDate: 2022-11-14
       
  • On generalized Saphar operators on Banach spaces

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      Abstract: Abstract A Saphar operator T on a Banach space X is one whose kernel is contained in its generalized range \(\bigcap \nolimits _{i=1}^{\infty }{\mathcal {R}}(T^{n})\) and its range and kernel are closed complemented subspaces. The purpose of this paper is to introduce and study a new class of operators that subsumes the class of Saphar operators, namely, the class of generalized Saphar operators. It is shown that the operators introduced can be characterized in several ways, particularly by means of specific Kato decompositions. Generalized Saphar spectrum of an operator T is also introduced and proven to be a compact subset of the complex plane.
      PubDate: 2022-11-08
       
  • Approximation in $$AC(\sigma )$$

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      Abstract: Abstract For a nonempty compact subset \(\sigma\) in the plane, the space \(AC(\sigma )\) is the closure of the space of complex polynomials in two real variables under a particular variation norm. In the classical setting, AC[0, 1] contains several other useful dense subsets, such as continuous piecewise linear functions, \(C^1\) functions and Lipschitz functions. In this paper, we examine analogues of these results in this more general setting.
      PubDate: 2022-11-07
       
  • Well-posedness and blowup criterion to the double-diffusive
           magnetoconvection system in 3D

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      Abstract: Abstract We consider the well-posedness and blowup criterion to the double-diffusive magnetoconvection system in 3D. First, we establish the existence and uniqueness of the local strong solution to the system (1.1) in \(H^1({\mathbb {R}}^3)\) with arbitrary initial data, and obtain the global strong solution when the \(L^2\) norm of the initial data is small. This result can be regarded as a generalization of the methods in Chen et al. (J Math Phys 60(1):011511, 2019). Then, we provide some sufficient conditions for the breakdown of local strong solution to system (1.1) in terms of velocity (or gradient of velocity) in weak \(L^p\) spaces. Finally, we focus on blowup criterion only depends on partial derivative of the planar components \(({\tilde{u}}, {\tilde{b}})\) without \(u_3\) and \(b_3\) in \({{\text {BMO}}}^{-1}\) space. More precisely, if local solution satisfies $$\begin{aligned} \int ^{T}_{0}\Vert \nabla _{h}{\tilde{u}}(t)\Vert ^{2}_{{\text {BMO}}^{-1}} +\Vert \nabla _{h}{\tilde{b}}(t)\Vert ^{2}_{{\text {BMO}}^{-1}} {\text {d}}t<\infty , \end{aligned}$$ then the strong solution \((u, b, \theta , s)\) can be extended smoothly beyond \(t=T\) . This improves and extends several previous BKM’s criteria (Chol-Jun in Nonlinear Anal Real World Appl 59:103271, 2021; Guo et al. in J Math Anal Appl 458(1):755–766, 2018).
      PubDate: 2022-11-03
       
  • On weighted inequalities for a class of quasilinear integral operators

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      Abstract: Abstract In this paper, we establish necessary and sufficient conditions under which certain weighted inequalities hold for a class of quasilinear integral operators with kernels.
      PubDate: 2022-10-29
       
  • Ternary rings of unbounded operators

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      Abstract: Abstract We initiate a study of ternary rings of unbounded operators (TRUOs) which are local version of ternary rings of bounded operators. Abstract definition of ternary Pro \(C^*\) -rings is also proposed. A one-to-one correspondence between representations of TRUO and its linking Pro \(C^*\) -algebra is obtained. Finally we examine their tensor products particularly, injective and projective tensor products.
      PubDate: 2022-10-26
       
  • Publisher Correction: Quasi-Banach modulation spaces and localization
           operators on locally compact abelian groups

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      PubDate: 2022-10-17
       
  • Asymptotic dynamics of stochastic delay nonclassical diffusion equations
           on unbounded domains

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      Abstract: Abstract The goal of this paper is to investigate three kinds of stability of pullback random attractors (PRAs) for stochastic nonclassical diffusion equations with distributed delay and constant delay perturbed by operator-type noise defined on \({\mathbb{R}}^{n}.\) We first prove the existence, uniqueness, backward compactness and backward longtime stability of PRAs for this equation. We then establish the zero-memory stability of PRAs. Finally, we study the asymptotically autonomous stability of PRAs. Due to the problem of the non-compactness of Sobolev embeddings on \({\mathbb{R}}^{n},\) we use the backward tail-estimates method and spectrum decomposition technique to prove the backward asymptotic compactness of solutions.
      PubDate: 2022-10-15
       
  • Differentiability of logarithmic Besov functions in terms of capacities

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      Abstract: Abstract In this article, the authors investigate the differentiability of functions from logarithmic Besov spaces via establishing the high order analogue of the Lebesgue differentiation theorem for these functions, and prove that the related exceptional sets have zero logarithmic Besov capacity. To this end, the authors establish the lifting theorem and the Peetre maximal function characterization of logarithmic Besov spaces, and then give several properties for the logarithmic Besov capacity, including delicately estimating the logarithmic Besov capacity of Euclidean balls, which might have their own independent interests.
      PubDate: 2022-10-11
       
  • Positive Toeplitz operators from a harmonic Bergman–Besov space into
           another

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      Abstract: Abstract We define positive Toeplitz operators between harmonic Bergman–Besov spaces \(b^p_\alpha \) on the unit ball of \({\mathbb {R}}^n\) for the full ranges of parameters \(0<p<\infty \) , \(\alpha \in {\mathbb {R}}\) . We give characterizations of bounded and compact Toeplitz operators taking one harmonic Bergman–Besov space into another in terms of Carleson and vanishing Carleson measures. We also give characterizations for a positive Toeplitz operator on \(b^{2}_{\alpha }\) to be a Schatten class operator \(S_{p}\) in terms of averaging functions and Berezin transforms for \(1\le p<\infty \) , \(\alpha \in {\mathbb {R}}\) . Our results extend those known for harmonic weighted Bergman spaces.
      PubDate: 2022-10-05
       
  • Denseness of norm attaining compact operators to some vector-valued
           function spaces

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      Abstract: Abstract It is known that every compact linear operator from a Banach space to a uniform algebra can be approximated by norm attaining ones. In this paper, we study this approximation for compact operators whose range is a vector-valued function space.
      PubDate: 2022-10-02
       
  • Centre of a compact convex set

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      Abstract: Abstract We introduce the notion centre of a convex set and study the space of continuous affine functions on a compact convex set with a centre. We show that these spaces are precisely the dual of a base normed space in which the underlying base has a (unique) centre. We also characterize the corresponding base norm space. We obtain a condition on a compact, balanced, convex subset of a locally convex space, so that the corresponding space of continuous affine functions on the convex set is an absolute order unit space. Similarly, we characterize a condition on the base with a centre of a base normed space, so that the latter becomes an absolutely base normed space.
      PubDate: 2022-10-01
       
  • Compact spaces associated to separable Banach lattices

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      Abstract: Abstract We study the class of compact spaces that appear as structure spaces of separable Banach lattices. In other words, we analyze what C(K) spaces appear as principal ideals of separable Banach lattices. Among other things, it is shown that every such compactum K admits a strictly positive regular Borel measure of countable type that is analytic, and in the nonmetrizable case these compacta are saturated with copies of \(\beta {{\mathbb{N}}}.\) Some natural questions about this class are left open.
      PubDate: 2022-09-30
       
  • Nuclear and multiple 1-summing operators on $$X_{1}\times \cdots \times
           X_{k}\times c_{0}$$

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      Abstract: Abstract We give the necessary and sufficient conditions for bounded multilinear operators on \(X_{1}\times \cdots \times X_{k}\times c_{0}\) to be nuclear or multiple 1-summing. We find the necessary and sufficient conditions for some bounded bilinear operators from \(l_{p}\times c_{0}\) into Y to be nuclear or multiple 1-summing operators. In the case of some bounded bilinear operators from \(l_{p}\times c_{0}\) into \(c_{0}\) associated to the classical methods of summability, we find the necessary and sufficient conditions for these be nuclear or multiple 1-summing operators. We show that, contrary to the bilinear case, in the multilinear case the situation change.
      PubDate: 2022-09-25
       
  • The $$C^*$$ -algebra of the variable Mautner group

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      Abstract: Abstract Let \({\mathbb{M}}=P\times {M}\) be a variable Mautner group. We describe the \(C^*\) -algebra \(C^*({\mathbb{M}})\) of \({\mathbb{M}}\) in terms of an algebra of operator fields defined over \(P\times {{\mathbb{C}}^2} .\)
      PubDate: 2022-09-24
       
  • Amenable fusion algebraic actions of discrete quantum groups on compact
           quantum spaces

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      Abstract: Abstract In this paper, we introduce actions of fusion algebras on unital \(C^*\) -algebras, and define amenability for fusion algebraic actions. Motivated by S. Neshveyev et al.’s work, considering the representation ring of a compact quantum group as a fusion algebra, we define the canonical fusion algebraic (for short, CFA) form of a discrete quantum group action on a compact quantum space. Furthermore, through the CFA form, we define FA-amenability of discrete quantum group actions, and present some basic connections between FA-amenable actions and amenable discrete quantum groups. As an application, thinking of a state on a unital \(C^*\) -algebra as a “probability measure” on a compact quantum space, we show that amenability for a discrete quantum group is equivalent to both of FA-amenability for an action of this discrete quantum group on a compact quantum space and the existence of this kind of “probability measure” that is FA-invariant under this action.
      PubDate: 2022-09-13
      DOI: 10.1007/s43037-022-00217-2
       
  • Dirichlet polynomials and a moment problem

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      Abstract: Abstract Consider a linear functional L defined on the space \({\mathcal {D}}[s]\) of Dirichlet polynomials with real coefficients and the set \({\mathcal {D}}_+[s]\) of non-negative elements in \({\mathcal {D}}[s].\) An analogue of the Riesz–Haviland theorem in this context asks: What are all \({\mathcal {D}}_+[s]\) -positive linear functionals L,  which are moment functionals' Since the space \({\mathcal {D}}[s],\) when considered as a subspace of \(C([0, \infty ), {\mathbb {R}}),\) fails to be an adapted space in the sense of Choquet, the general form of Riesz–Haviland theorem is not applicable in this situation. In an attempt to answer the forgoing question, we arrive at the notion of a moment sequence, which we call the Hausdorff log-moment sequence. Apart from an analogue of the Riesz–Haviland theorem, we show that any Hausdorff log-moment sequence is a linear combination of \(\{1, 0, \ldots , \}\) and \(\{f(\log (n)\}_{n \geqslant 1}\) for a completely monotone function \(f : [0, \infty ) \rightarrow [0, \infty ).\) Moreover, such an f is uniquely determined by the sequence in question.
      PubDate: 2022-09-09
      DOI: 10.1007/s43037-022-00208-3
       
  • Equality in Hausdorff–Young for hypergroups

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      Abstract: Abstract It was shown in [Colloq. Math. 131(2), 219--231 (2013)]  that one can extend the domain of Fourier transform of a commutative hypergroup K to \(L^p(K)\) for \(1\le p \le 2\) , and the Hausdorff–Young inequality holds true for these cases. In this article, we examine the structure of non-zero functions in \(L^p(K)\) for which equality is attained in the Hausdorff–Young inequality, for \(1<p<2\) , and further provide a characterization for the basic uncertainty principle for commutative hypergroups with non-trivial center.
      PubDate: 2022-09-01
      DOI: 10.1007/s43037-022-00211-8
       
  • An interpolation problem for conjugations III

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      Abstract: Abstract We consider in this paper the following interpolation problem: characterize the class of pairs (P, Q) of self-adjoint operators on a complex Hilbert space \({\mathcal {H}}\) satisfying \(CPC=Q\) for some conjugation C on \({\mathcal {H}}\) . Based on a concrete description of normal operators commuting with conjugations, we give a solution to the problem in the case that P commutes with Q.
      PubDate: 2022-08-29
      DOI: 10.1007/s43037-022-00216-3
       
 
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