Subjects -> MATHEMATICS (Total: 1013 journals)
    - APPLIED MATHEMATICS (92 journals)
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    - MATHEMATICS (714 journals)
    - MATHEMATICS (GENERAL) (45 journals)
    - NUMERICAL ANALYSIS (26 journals)
    - PROBABILITIES AND MATH STATISTICS (113 journals)

MATHEMATICS (714 journals)            First | 1 2 3 4     

Showing 401 - 538 of 538 Journals sorted alphabetically
Journal of Mathematical and Fundamental Sciences     Open Access  
Journal of Mathematical Behavior     Hybrid Journal   (Followers: 6)
Journal of Mathematical Chemistry     Hybrid Journal   (Followers: 5)
Journal of Mathematical Finance     Open Access   (Followers: 6)
Journal of Mathematical Imaging and Vision     Hybrid Journal   (Followers: 6)
Journal of Mathematical Logic     Hybrid Journal   (Followers: 2)
Journal of Mathematical Sciences     Hybrid Journal  
Journal of Mathematical Sciences and Applications     Open Access   (Followers: 2)
Journal of Mathematical Sociology     Hybrid Journal   (Followers: 3)
Journal of Mathematics     Open Access  
Journal of Mathematics and Statistics     Open Access   (Followers: 6)
Journal of Mathematics and Statistics Studies     Open Access  
Journal of Mathematics and the Arts     Hybrid Journal   (Followers: 1)
Journal of Mathematics Education at Teachers College     Open Access   (Followers: 4)
Journal of Mathematics in Industry     Open Access  
Journal of Mathematics Research     Open Access  
Journal of Metallurgy     Open Access   (Followers: 8)
Journal of Modern Mathematics Frontier     Open Access  
Journal of Multidisciplinary Modeling and Optimization     Open Access   (Followers: 1)
Journal of Multivariate Analysis     Hybrid Journal   (Followers: 15)
Journal of Nonlinear Analysis and Optimization : Theory & Applications     Open Access   (Followers: 4)
Journal of Nonlinear Mathematical Physics     Hybrid Journal   (Followers: 2)
Journal of Nonlinear Science     Hybrid Journal   (Followers: 1)
Journal of Numerical Cognition     Open Access   (Followers: 1)
Journal of Optimization     Open Access   (Followers: 5)
Journal of Peridynamics and Nonlocal Modeling     Hybrid Journal  
Journal of Progressive Research in Mathematics     Open Access   (Followers: 1)
Journal of Pseudo-Differential Operators and Applications     Hybrid Journal  
Journal of Pure and Applied Algebra     Full-text available via subscription   (Followers: 3)
Journal of Quantitative Linguistics     Hybrid Journal   (Followers: 6)
Journal of Scientific Computing     Hybrid Journal   (Followers: 19)
Journal of Scientific Research     Open Access  
Journal of Symbolic Computation     Hybrid Journal   (Followers: 2)
Journal of the Australian Mathematical Society     Full-text available via subscription  
Journal of the Egyptian Mathematical Society     Open Access  
Journal of the Indian Mathematical Society     Hybrid Journal  
Journal of the Institute of Mathematics of Jussieu     Hybrid Journal  
Journal of the London Mathematical Society     Hybrid Journal   (Followers: 3)
Journal of the Nigerian Mathematical Society     Open Access  
Journal of Theoretical and Applied Physics     Open Access   (Followers: 9)
Journal of Topology and Analysis     Hybrid Journal  
Journal of Transport and Supply Chain Management     Open Access   (Followers: 10)
Journal of Turbulence     Hybrid Journal   (Followers: 7)
Journal of Universal Mathematics     Open Access  
Journal of Urban Regeneration & Renewal     Full-text available via subscription   (Followers: 8)
JRAMathEdu : Journal of Research and Advances in Mathematics Education     Open Access   (Followers: 4)
JUMLAHKU : Jurnal Matematika Ilmiah STKIP Muhammadiyah Kuningan     Open Access  
JURING (Journal for Research in Mathematics Learning)     Open Access  
Jurnal Didactical Mathematics     Open Access   (Followers: 4)
Jurnal Matematika     Open Access  
Jurnal Matematika, Sains, Dan Teknologi     Open Access  
Jurnal Natural     Open Access  
Jurnal Pendidikan Matematika Raflesia     Open Access  
Jurnal Penelitian Pembelajaran Matematika Sekolah     Open Access  
Jurnal Penelitian Sains (JPS)     Open Access  
Jurnal Riset Pendidikan Matematika     Open Access  
Jurnal Sains Matematika dan Statistika     Open Access  
Jurnal Tadris Matematika     Open Access  
Jurnal Teknologi dan Sistem Komputer     Open Access  
Kontinu : Jurnal Penelitian Didaktik Matematika     Open Access  
Kreano, Jurnal Matematika Kreatif-Inovatif     Open Access  
Le Matematiche     Open Access  
Lettera Matematica     Hybrid Journal  
Lietuvos Matematikos Rinkinys     Open Access  
Limits : Journal of Mathematics and Its Applications     Open Access  
Linear Algebra and its Applications     Full-text available via subscription   (Followers: 22)
Linear and Multilinear Algebra     Hybrid Journal   (Followers: 7)
Lithuanian Mathematical Journal     Hybrid Journal  
Lobachevskii Journal of Mathematics     Open Access  
Logic Journal of the IGPL     Hybrid Journal   (Followers: 1)
Logica Universalis     Hybrid Journal  
manuscripta mathematica     Hybrid Journal   (Followers: 1)
MaPan : Jurnal Matematika dan Pembelajaran     Open Access  
Marine Genomics     Hybrid Journal   (Followers: 1)
Matemáticas, Educación y Sociedad     Open Access  
Matematicheskie Zametki     Full-text available via subscription  
Mathematica Scandinavica     Full-text available via subscription   (Followers: 1)
Mathematical Analysis and its Contemporary Applications     Open Access   (Followers: 1)
Mathematical Communications     Open Access  
Mathematical Computation     Open Access   (Followers: 1)
Mathematical Geosciences     Hybrid Journal   (Followers: 4)
Mathematical Journal of Interdisciplinary Sciences     Open Access   (Followers: 1)
Mathematical Medicine and Biology: A Journal of the IMA     Hybrid Journal   (Followers: 1)
Mathematical Methods in the Applied Sciences     Hybrid Journal   (Followers: 4)
Mathematical Methods of Statistics     Hybrid Journal   (Followers: 4)
Mathematical Modelling and Analysis     Open Access   (Followers: 1)
Mathematical Modelling of Natural Phenomena     Open Access   (Followers: 1)
Mathematical Models and Methods in Applied Sciences     Hybrid Journal   (Followers: 1)
Mathematical Notes     Hybrid Journal  
Mathematical Proceedings of the Cambridge Philosophical Society     Full-text available via subscription   (Followers: 2)
Mathematical Programming Computation     Hybrid Journal   (Followers: 2)
Mathematical Sciences     Open Access  
Mathematical Social Sciences     Hybrid Journal   (Followers: 1)
Mathematical Theory and Modeling     Open Access   (Followers: 6)
Mathematical Thinking and Learning     Hybrid Journal   (Followers: 4)
Mathematics and Statistics     Open Access   (Followers: 2)
Mathematics Education Forum Chitwan     Open Access   (Followers: 1)
Mathematics Education Journal     Open Access   (Followers: 4)
Mathematics Education Research Journal     Partially Free   (Followers: 16)
Mathematics of Control, Signals, and Systems (MCSS)     Hybrid Journal   (Followers: 5)
Mathematics Teacher: Learning and Teaching PK-12     Full-text available via subscription   (Followers: 9)
Mathematics Teaching in the Middle School     Full-text available via subscription   (Followers: 8)
Mathematische Annalen     Hybrid Journal   (Followers: 2)
Mathematische Nachrichten     Hybrid Journal   (Followers: 1)
Mathematische Semesterberichte     Hybrid Journal  
Mathematische Zeitschrift     Hybrid Journal   (Followers: 2)
MATICS     Open Access  
Matrix Science Mathematic     Open Access   (Followers: 1)
Measurement Science Review     Open Access   (Followers: 3)
Mediterranean Journal of Mathematics     Hybrid Journal  
Memetic Computing     Hybrid Journal  
Mendel : Soft Computing Journal     Open Access  
Metaheuristics     Hybrid Journal  
Metals and Materials International     Hybrid Journal   (Followers: 1)
Metascience     Hybrid Journal   (Followers: 1)
Metrology and Instruments / Метрологія та прилади     Open Access  
Milan Journal of Mathematics     Hybrid Journal  
MLQ- Mathematical Logic Quarterly     Hybrid Journal   (Followers: 1)
Modelling in Civil and Environmental Engineering     Open Access   (Followers: 4)
MONA : Matematik- og Naturfagsdidaktik     Hybrid Journal  
Monatshefte fur Mathematik     Hybrid Journal  
Moroccan Journal of Pure and Applied Analysis     Open Access  
Moscow University Mathematics Bulletin     Hybrid Journal  
MSOR Connections     Open Access   (Followers: 1)
Multiscale Modeling and Simulation     Hybrid Journal   (Followers: 2)
MUST : Journal of Mathematics Education, Science and Technology     Open Access   (Followers: 4)
Nagoya Mathematical Journal     Hybrid Journal   (Followers: 1)
Nano Research     Hybrid Journal   (Followers: 4)
Nanotechnologies in Russia     Hybrid Journal  
Natural Resource Modeling     Hybrid Journal  
New Mathematics and Natural Computation     Hybrid Journal   (Followers: 1)
Nonlinear Analysis     Hybrid Journal   (Followers: 1)
Nonlinear Analysis : Modelling and Control     Open Access   (Followers: 1)
Nonlinear Analysis: Hybrid Systems     Hybrid Journal  
Nonlinear Analysis: Real World Applications     Hybrid Journal   (Followers: 2)
Nonlinear Differential Equations and Applications NoDEA     Hybrid Journal  
North Carolina Journal of Mathematics and Statistics     Open Access  
Note di Matematica     Open Access  
NTM Zeitschrift für Geschichte der Wissenschaften, Technik und Medizin     Hybrid Journal   (Followers: 3)
Numeracy : Advancing Education in Quantitative Literacy     Open Access   (Followers: 1)
Numerical Analysis and Applications     Hybrid Journal   (Followers: 1)
Numerical Functional Analysis and Optimization     Hybrid Journal   (Followers: 3)
Numerical Linear Algebra with Applications     Hybrid Journal   (Followers: 7)
Numerische Mathematik     Hybrid Journal  
Open Journal of Discrete Mathematics     Open Access   (Followers: 3)
Open Journal of Modelling and Simulation     Open Access   (Followers: 2)
Operations Research Letters     Hybrid Journal   (Followers: 11)
Optimization Letters     Hybrid Journal   (Followers: 2)
Optimization Methods and Software     Hybrid Journal   (Followers: 6)
Opuscula Mathematica     Open Access  
Order     Hybrid Journal  
ORiON     Open Access  
P-Adic Numbers, Ultrametric Analysis, and Applications     Hybrid Journal  
PAMM : Proceedings in Applied Mathematics and Mechanics     Free  
Parallel Processing Letters     Hybrid Journal   (Followers: 3)
Peking Mathematical Journal     Hybrid Journal  
Periodica Mathematica Hungarica     Full-text available via subscription   (Followers: 1)
Petroleum Science     Open Access  
Philosophia Mathematica     Hybrid Journal   (Followers: 1)
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences     Full-text available via subscription   (Followers: 9)
PNA. Revista de Investigación en Didáctica de la Matemática     Open Access  
Polar Science     Hybrid Journal   (Followers: 3)
Positivity     Hybrid Journal  
Press Start     Open Access   (Followers: 1)
Prime Number     Full-text available via subscription  
Probability in the Engineering and Informational Sciences     Hybrid Journal   (Followers: 1)
Problemy Peredachi Informatsii     Full-text available via subscription  
Proceedings - Mathematical Sciences     Open Access   (Followers: 5)
Proceedings of the American Mathematical Society, Series B     Open Access   (Followers: 3)
Proceedings of the Edinburgh Mathematical Society     Hybrid Journal  
Proceedings of the Institution of Civil Engineers - Engineering and Computational Mechanics     Hybrid Journal   (Followers: 2)
Proceedings of the Latvian Academy of Sciences. Section B: Natural, Exact and Applied Sciences     Open Access   (Followers: 1)
Proceedings of the London Mathematical Society     Hybrid Journal   (Followers: 4)
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences     Full-text available via subscription   (Followers: 6)
Proceedings of the Royal Society of Edinburgh Section A Mathematics     Full-text available via subscription  
Proceedings of the Steklov Institute of Mathematics     Hybrid Journal  
Progress in Photovoltaics: Research & Applications     Hybrid Journal   (Followers: 6)
Proyecciones : Revista de Matematica     Open Access   (Followers: 1)
Publications Mathématiques de Besançon : Algèbre et Théorie des Nombres     Open Access  
Publications Mathématiques de L'IHÉS     Hybrid Journal   (Followers: 3)
Punjab University Journal of Mathematics     Open Access   (Followers: 2)
Pure Mathematics and Applications     Open Access  
Pythagoras     Open Access  
Quaestiones Mathematicae     Hybrid Journal  
Qualitative Theory of Dynamical Systems     Hybrid Journal  
Quantum Studies : Mathematics and Foundations     Hybrid Journal   (Followers: 2)
Quarterly Journal of Mathematics     Hybrid Journal  
Rare Metals     Hybrid Journal   (Followers: 2)
Recreational Mathematics Magazine     Open Access  
REDIMAT : Journal of Research in Mathematics Education     Open Access   (Followers: 6)
REMAT : Revista Eletrônica da Matemática     Open Access  
Rendiconti del Circolo Matematico di Palermo     Hybrid Journal  
Reportes Científicos de la FaCEN     Open Access  
Research in Mathematics Education     Hybrid Journal   (Followers: 13)
Research in Nondestructive Evaluation     Hybrid Journal   (Followers: 7)
Research in Number Theory     Hybrid Journal  
Research in the Mathematical Sciences     Open Access  
Research Journal of Pure Algebra     Open Access   (Followers: 1)
Researches in Mathematics     Open Access  
Results in Control and Optimization     Open Access  

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Similar Journals
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Positivity
Journal Prestige (SJR): 0.605
Citation Impact (citeScore): 1
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1572-9281 - ISSN (Online) 1385-1292
Published by Springer-Verlag Homepage  [2469 journals]
  • Some results of ( $$\sigma $$ σ -)Levi operators in Banach lattices

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      Abstract: Abstract Let E, F and G be Banach lattices. \({\mathscr {A}}_{G}(E,F)\) is the collection of all bounded operators from E to F, that \(TU:G\rightarrow F\) is regular for every bounded linear operator \(U:G\rightarrow E\) . The operator class \({\mathscr {A}}_{G}(E,F)\) has studied. A result of Yanovskii show that \(T:E\rightarrow F\in {\mathscr {A}}_{c_0}(E,F^{\prime \prime })\) if and only if T is weak serially summing operator i.e. the series [Yanovskii, L.P (Math. J. 20(2); 287–292, 1979)] \(\sum \limits _{i=1}^\infty Tx_i \) is weak unconditional convergence if \(\sum \limits _{i=1}^\infty x_i\) is unconditional convergence. In this paper, we study \({\mathscr {A}}_{G}(E,F)\) , where G is an AL-space, by introducing two new operator related to Levi property, which are named Levi operator and \(\sigma \) -Levi operator respectively. Suppose \(T:E\rightarrow F\ge 0\) . We shows that if E has weak Fatou property then T is \(\sigma \) -Levi if and only if \(T\in {\mathscr {A}}_{G}(E,F)\) for every separable AL-space G if and only if \(T\in {\mathscr {A}}_{L_1[0,2\pi ]}(E,F)\) . Some relationships of two class operators and other operator classes are given.
      PubDate: 2022-05-10
       
  • On the class of b almost order (L) sets in Banach lattices

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      Abstract: Abstract The paper is devoted to such sets of \(E'\) on which every b order bounded disjoint sequence \((x_{n})\subset E\) converges uniformly to zero. We characterize this class of sets (b almost order (L) sets), consequently, we obtain some new characterizations of b weakly compact operators and KB spaces. Moreover, we present a dual version of Dunford Pettis theorem concerning relatively weakly compact subsets of a KB space, and show that in a Banach lattice whose dual has order continuous norm, every b almost order (L) set is relatively weakly compact. Furthermore, we prove that we can replace disjoint sequences appearing in the definition of b almost order (L) sets with positive weakly null ones, and we claim that a subset \(A \subset E'\) is b almost order (L) set if, and only if, every b order bounded positive weakly null sequence converges uniformly to zero on the subset A.
      PubDate: 2022-05-10
       
  • General reiteration theorems for $${{\mathcal {R}}}$$ R and $${{\mathcal
           {L}}}$$ L classes: mixed interpolation of $${{\mathcal {R}}}$$ R and
           $${{\mathcal {L}}}$$ L -spaces

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      Abstract: Abstract Given \(E_0, E_1, F_0, F_1, E\) rearrangement invariant function spaces, \(a_0\) , \(a_1\) , \(\mathrm {b}_0\) , \(\mathrm {b}_1\) , \(\mathrm {b}\) slowly varying functions and \(0< \theta _0<\theta _1<1\) , we characterize the interpolation spaces $$\begin{aligned} \big ({\overline{X}}^{{\mathcal {R}}}_{\theta _0,\mathrm {b}_0,E_0,a_0,F_0}, {\overline{X}}^{{\mathcal {R}}}_{\theta _1, \mathrm {b}_1,E_1,a_1,F_1}\big )_{\theta ,\mathrm {b},E},\quad \big ({\overline{X}}^{{\mathcal {L}}}_{\theta _0, \mathrm {b}_0,E_0,a_0,F_0}, {\overline{X}}^{\mathcal L}_{\theta _1,\mathrm {b}_1,E_1,a_1,F_1}\big )_{\theta ,\mathrm {b},E} \end{aligned}$$ and $$\begin{aligned} \big ({\overline{X}}^{{\mathcal {R}}}_{\theta _0,\mathrm {b}_0,E_0,a_0,F_0}, {\overline{X}}^{{\mathcal {L}}}_{\theta _1, \mathrm {b}_1,E_1,a_1,F_1}\big )_{\theta ,\mathrm {b},E},\quad \big ({\overline{X}}^{{\mathcal {L}}}_{\theta _0, \mathrm {b}_0,E_0,a_0,F_0}, {\overline{X}}^{\mathcal R}_{\theta _1,\mathrm {b}_1,E_1,a_1,F_1}\big )_{\theta ,\mathrm {b},E}, \end{aligned}$$ for all possible values of \(\theta \in [0,1]\) . Applications to interpolation identities for grand and small Lebesgue spaces, Gamma spaces and A and B-type spaces are given.
      PubDate: 2022-04-29
       
  • Some note on a positive tensor and its Hadamard powers eigenvalue

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      Abstract: Abstract In this paper, we prove that Hadamard power of a even-order positive tensor has only one positive eigenvalue. We define a conditionally negative definite tensor and an m-invertible tensor. We prove that if \({\mathscr {A}} =(a_{i_1i_2\ldots i_m})\) is a conditionally negative definite and positive tensor, then \({\mathscr {A}}\) has exactly one positive eigenvalue. Next, we prove that if \({\mathscr {A}} =(a_{i_1i_2\ldots i_m})\) is an orthogonally decomposable tensor whose all entries are positive and has only one positive eigenvalue, then \({\mathscr {A}}^{\circ r} = (a^r_{i_1i_2\ldots i_m})\) also has only one positive eigenvalue for all \(r\in [0,1)\) . Also, the Hadamard inverse of \({\mathscr {A}}\) (with \(a_{i_1\dots i_m}\ne 0\) for all \(1\le i_1,\ldots , i_m\le n\) ) denoted by \({{\mathscr {A}}^\circ }^{(-1)}=(1/a_{i_1\dots i_m})\) is positive semi-definite.
      PubDate: 2022-04-29
       
  • un L- and M-weakly compact operators on Banach lattices

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      Abstract: Abstract Several recent papers investigated unbounded convergences in Banach lattices. In this paper, we first introduce un L- and M-weakly compact operators on Banach lattices, which contrast with L-(M-)weakly compact operators, by unbounded norm convergence. Then we research the relationship between these operators and L-(M-) weakly compact operators. Finally, we study the order and lattice structure of un L- and M-weakly compact operators.
      PubDate: 2022-04-25
       
  • Mean inequalities for sector matrices involving positive linear maps

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      Abstract: Abstract Let \({\mathcal {S}}_{\alpha } (0 \le \alpha <\frac{\pi }{2} )\) stand for the set of all complex sector matrices and \(\sigma _1, \sigma _2\) be two operator means satisfying \(\sigma _1 \le \sigma _2.\) Except some other assertions, it is also shown that for \(A, B \in {\mathcal {S}}_{\alpha }, \) $$\begin{aligned} \Re (A\sigma _1 B)\le \sec ^2\alpha \ \Re (A\sigma _2 B) \end{aligned}$$ and $$\begin{aligned} \Re (A\sigma _2 B)^{-1}\le \sec ^2\alpha \ \Re (A\sigma _1 B)^{-1}. \end{aligned}$$ In addition, if \(\sigma _i^{*} \le \sigma _i,\) for \(i=1, 2\) and \(\Phi \) is a unital positive linear map, then $$\begin{aligned} \Phi \Re (A \sigma _1 B)^{-1}\le \sec ^2\alpha \ \Re \big (\Phi (A^{-1})\sigma _2\Phi (B^{-1})\big ). \end{aligned}$$
      PubDate: 2022-04-25
       
  • A Voronovskaja type formula for Soardi’s operators

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      Abstract: Abstract In 1991 Soardi introduced a sequence of positive linear operators \(\beta _{n}\) associating to each function \(f\in C\left[ 0,1\right] \) a polynomial function which is closely related to the Bernstein polynomials on \(\left[ -1,+1\right] \) . One of the authors already studied the operators \(\beta _{n}\) in several papers. This paper is devoted to other properties of Soardi’s operators. We introduce a version \({\tilde{\beta }}_{n}\) which can be expressed in terms of the classical Bernstein operators and present the relations between \(\beta _{n}\) and \({\tilde{\beta }}_{n}\) . We derive Voronovskaja-type results for both \(\beta _{n}\) and \({\tilde{\beta }}_{n}\) . Furthermore, rates of convergence for \({\tilde{\beta }}_{n}\) , respectively \(\beta _{n}\) , are estimated. Finally, we study the first and second moments of \(\beta _{n}\) .
      PubDate: 2022-04-25
       
  • Some characterizations of L-weakly compact sets using the unbounded
           absolute weak convergence and applications

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      Abstract: Abstract Based on the concept of unbounded absolute weak convergence, we give new characterizations of L-weakly compact sets. As applications, we find new properties of some classes of operators. Also, new characterizations of order continuous Banach lattices are obtained.
      PubDate: 2022-04-23
       
  • Inequalities for moduli of smoothness on two-point homogeneous spaces

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      Abstract: Abstract We show an asymptotic relation between the fractional Peetre type K-functional and the modulus of smoothness on a compact two-point homogeneous space. This extends both: the well known results on the spherical setting and results for the modulus of smoothness with positive integer degree of smoothness. This is a natural continuation of the research including a previous characterization, obtained by first author in 2019 (Carrijo in Positivity 24:761–777, 2020). An application of the asymptotic relation obtained is employed to prove a reciprocal result for the standard decrease property of the degree of the fractional modulus of smoothness.
      PubDate: 2022-04-22
       
  • Estimates for operators on generalized weighted Orlicz-Morrey spaces and
           their applications to non-divergence elliptic equations

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      Abstract: Abstract We show continuity in generalized weighted Orlicz-Morrey spaces \(M^{\Phi ,\varphi }_{w}\) of sublinear integral operators generated by some classical integral operators and commutators. The obtained estimates are used to study global regularity of the solution of the Dirichlet problem for linear uniformly elliptic operators with discontinuous data.
      PubDate: 2022-04-20
       
  • Some results on almost L-weakly and almost M-weakly compact operators

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      Abstract: Abstract The class of weakly compact operators does not contain that of almost L-weakly compact operators. In this paper, we provide a complete answer by giving necessary and sufficient conditions for which every positive almost L-weakly compact operator \(T:E\rightarrow F\) between two Banach lattices is weakly compact. On the other hand, we investigate conditions under which the adjoint operator of every positive almost L-weakly compact operator is almost M-weakly compact.
      PubDate: 2022-04-19
       
  • On positive and negative definite functions related to a big Heisenberg
           group

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      Abstract: Abstract Using a generalized Bochner type theorem for Olshanski spherical pairs, we prove a Lévy-Khinchin formula for the infinite dimensional Heisenberg group \(H_\infty = M(\infty , {\mathbb {C}})\times {\mathbb {R}}\) relatively to the action of the product group \(K_\infty =U(\infty )\times U(\infty )\) .
      PubDate: 2022-04-16
       
  • Order preserving quotient lifting properties

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      Abstract: Abstract Several properties of subspaces \(J \subset X\) in a pair (X, J) with quotient lifting properties of different types are derived, giving emphasis to order-preserving properties for order unit spaces and spaces of affine continuous functions on Choquet simplexes.
      PubDate: 2022-04-10
       
  • 2-Topological reflexivity of sets of isometries between bounded variation
           function spaces

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      Abstract: Abstract Given two subsets X and Y of the real line with at least two points, BV(X) and BV(Y) denote the Banach spaces of all functions of bounded variation on X and Y, respectively. In this paper we study the 2-topological reflexivity of sets of (not necessarily linear) surjective isometries from BV(X) onto BV(Y). In particular, we obtain generalizations of the known results concerning 2-algebraical reflexivity of sets of surjective complex-linear isometries of BV(X)-spaces.
      PubDate: 2022-03-24
       
  • Positivity and Schwarz inequality for Banach *-algebras

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      Abstract: Abstract We establish the Schwarz inequality for a class of Banach *-algebras, and use it to derive some consequences, for example when a linear map between Banach *-algebras is a Jordan homomorphism. This applies to the class of Banach *-algebras \(\ell ^1(G,A;\alpha )\) arising from C*-dynamical systems \((A,G,\alpha )\) with \(\alpha \) an action of a discrete group G on a separable C*-algebra A.
      PubDate: 2022-03-19
       
  • Uniqueness of unconditional basis of infinite direct sums of quasi-Banach
           spaces

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      Abstract: Abstract This paper is devoted to providing a unifying approach to the study of the uniqueness of unconditional bases, up to equivalence and permutation, of infinite direct sums of quasi-Banach spaces. Our new approach to this type of problem permits to show that a wide class of vector-valued sequence spaces have a unique unconditional basis up to a permutation. In particular, solving a problem from Albiac and Leránoz (J Math Anal Appl 374(2):394–401, 2011. https://doi.org/10.1016/j.jmaa.2010.09.048) we show that if \(X\) is quasi-Banach space with a strongly absolute unconditional basis then the infinite direct sum \(\ell _{1}(X)\) has a unique unconditional basis up to a permutation, even without knowing whether \(X\) has a unique unconditional basis or not. Applications to the uniqueness of unconditional structure of infinite direct sums of non-locally convex Orlicz and Lorentz sequence spaces, among other classical spaces, are also obtained as a by-product of our work.
      PubDate: 2022-03-19
       
  • Weakly Corson compact trees

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      Abstract: Abstract We introduce and study a new topology on trees, that we call the countably coarse wedge topology. Such a topology is strictly finer than the coarse wedge topology and it turns every chain complete, rooted tree into a Fréchet–Urysohn, countably compact topological space. We show the rôle of such topology in the theory of weakly Corson and weakly Valdivia compacta. In particular, we give the first example of a compact space T whose every closed subspace is weakly Valdivia, yet T is not weakly Corson. This answers a question due to Ondřej Kalenda.
      PubDate: 2022-03-15
       
  • Order integrals

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      Abstract: Abstract We define an integral of real-valued functions with respect to a measure that takes its values in the extended positive cone of a partially ordered vector space E. The monotone convergence theorem, Fatou’s lemma, and the dominated convergence theorem are established; the analogues of the classical \({\mathscr {L}}^1\) - and \({\mathrm L}^1\) -spaces are investigated. The results extend earlier work by Wright and specialise to those for the Lebesgue integral when E equals the real numbers. The hypothesis on E that is needed for the definition of the integral and for the monotone convergence theorem to hold ( \(\sigma \) -monotone completeness) is a rather mild one. It is satisfied, for example, by the space of regular operators between a directed partially ordered vector space and a \(\sigma \) -monotone complete partially ordered vector space, and by every JBW-algebra. Fatou’s lemma and the dominated convergence theorem hold for every \(\sigma \) -Dedekind complete space. When E consists of the regular operators on a Banach lattice with an order continuous norm, or when it consists of the self-adjoint elements of a strongly closed complex linear subspace of the bounded operators on a complex Hilbert space, then the finite measures as in the current paper are precisely the strongly \(\sigma \) -additive positive operator-valued measures. When E is a partially ordered Banach space with a closed positive cone, then every positive vector measure is a measure in our sense, but not conversely. Even when a measure falls into both categories, the domain of the integral as defined in this paper can properly contain that of any reasonably defined integral with respect to the vector measure using Banach space methods.
      PubDate: 2022-03-14
       
  • Uniform Kadec-Klee properties of Orlicz-Lorentz sequence spaces equipped
           with the Orlicz norm

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      Abstract: Abstract Uniform Kadec-Klee property, which takes an indispensable part in the researches of some mathematics branches, has attracted increasing extensive exploration and discussion. In this paper, necessary and sufficient conditions for uniform Kadec-Klee property in Orlicz-Lorentz sequence space equipped with Orlicz norm are given.
      PubDate: 2022-03-12
       
  • Mean ergodic composition operators on $$H^\infty (\mathbb {B}_n)$$ H
           ∞ ( B n )

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      Abstract: Abstract In this paper, we study (uniformly) mean ergodic composition operators on \(H^\infty (\mathbb {B}_n)\) . Under some additional assumptions, it is shown that mean ergodic operators have norm convergent iterates in \(H^\infty (\mathbb {B}_n)\) , and that they are always uniformly mean ergodic.
      PubDate: 2022-03-11
       
 
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