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  Subjects -> MATHEMATICS (Total: 864 journals)
    - APPLIED MATHEMATICS (68 journals)
    - GEOMETRY AND TOPOLOGY (19 journals)
    - MATHEMATICS (643 journals)
    - MATHEMATICS (GENERAL) (40 journals)
    - NUMERICAL ANALYSIS (19 journals)
    - PROBABILITIES AND MATH STATISTICS (75 journals)

MATHEMATICS (643 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)
Academic Voices : A Multidisciplinary Journal     Open Access   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 6)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 16)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 4)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 6)
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 21)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1)
Acta Mathematica     Hybrid Journal   (Followers: 10)
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: 5)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 4)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 1)
Advances in Fixed Point Theory     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 9)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 1)
Advances in Materials Sciences     Open Access   (Followers: 15)
Advances in Mathematical Physics     Open Access   (Followers: 6)
Advances in Mathematics     Full-text available via subscription   (Followers: 10)
Advances in Numerical Analysis     Open Access   (Followers: 3)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Pure and Applied Mathematics     Hybrid Journal   (Followers: 5)
Advances in Pure Mathematics     Open Access   (Followers: 4)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 5)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
Afrika Matematika     Hybrid Journal   (Followers: 1)
Air, Soil & Water Research     Open Access   (Followers: 7)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 2)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Full-text available via subscription   (Followers: 5)
Algorithms     Open Access   (Followers: 9)
Algorithms Research     Open Access  
American Journal of Biostatistics     Open Access   (Followers: 9)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 3)
American Journal of Mathematical Analysis     Open Access  
American Journal of Mathematics     Full-text available via subscription   (Followers: 7)
American Journal of Operations Research     Open Access   (Followers: 5)
American Mathematical Monthly     Full-text available via subscription   (Followers: 6)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 7)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access   (Followers: 1)
Analysis     Hybrid Journal   (Followers: 2)
Analysis and Applications     Hybrid Journal   (Followers: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 4)
Analysis Mathematica     Full-text available via subscription  
Annales Mathematicae Silesianae     Open Access  
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annales UMCS, 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: 8)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 6)
Annals of Mathematics     Full-text available via subscription  
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 6)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
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  
Annuaire du Collège de France     Open Access   (Followers: 5)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applications of Mathematics     Hybrid Journal   (Followers: 1)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Mathematics     Open Access   (Followers: 3)
Applied Mathematics     Open Access   (Followers: 4)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 4)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal  
Applied Mathematics Letters     Full-text available via subscription   (Followers: 1)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 1)
Applied Numerical Analysis & Computational Mathematics     Hybrid Journal   (Followers: 5)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 2)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 4)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites : The Journal of Space Research Centre of Polish Academy of Sciences     Open Access   (Followers: 17)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
Asian Journal of Current Engineering & Maths     Open Access  
Asian-European Journal of Mathematics     Hybrid Journal   (Followers: 2)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 6)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 1)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 1)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Axioms     Open Access  
Baltic International Yearbook of Cognition, Logic and Communication     Open Access  
Basin Research     Hybrid Journal   (Followers: 3)
BIBECHANA     Open Access  
BIT Numerical Mathematics     Hybrid Journal  
BoEM - Boletim online de Educação Matemática     Open Access  
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: 1)
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 19)
Bruno Pini Mathematical Analysis Seminar     Open Access  
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 5)
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: 1)
Bulletin of Mathematical Sciences     Open Access   (Followers: 2)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 3)
Bulletin of the Malaysian Mathematical Sciences Society     Hybrid Journal  
Calculus of Variations and Partial Differential Equations     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 18)
Carpathian Mathematical Publications     Open Access   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CAUCHY     Open Access   (Followers: 1)
CEAS Space Journal     Hybrid Journal  
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
ChemSusChem     Hybrid Journal   (Followers: 7)
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  
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Full-text available via subscription   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Commentarii Mathematici Helvetici     Hybrid Journal   (Followers: 1)
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 1)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 3)
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Complexus     Full-text available via subscription  
Composite Materials Series     Full-text available via subscription   (Followers: 9)
Comptes Rendus Mathematique     Full-text available via subscription   (Followers: 1)
Computational and Applied Mathematics     Hybrid Journal   (Followers: 2)
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 4)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Concrete Operators     Open Access   (Followers: 4)
Confluentes Mathematici     Hybrid Journal  
COSMOS     Hybrid Journal  
Cryptography and Communications     Hybrid Journal   (Followers: 12)
Cuadernos de Investigación y Formación en Educación Matemática     Open Access  
Cubo. A Mathematical Journal     Open Access  
Czechoslovak Mathematical Journal     Hybrid Journal   (Followers: 1)
Demographic Research     Open Access   (Followers: 11)
Demonstratio Mathematica     Open Access  
Dependence Modeling     Open Access  
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 28)
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: 2)
Discrete Mathematics     Hybrid Journal   (Followers: 7)
Discrete Mathematics & Theoretical Computer Science     Open Access  
Discrete Mathematics, Algorithms and Applications     Hybrid Journal   (Followers: 2)
Discussiones Mathematicae Graph Theory     Open Access   (Followers: 1)
Doklady Mathematics     Hybrid Journal  
Duke Mathematical Journal     Full-text available via subscription   (Followers: 1)
Edited Series on Advances in Nonlinear Science and Complexity     Full-text available via subscription  
Electronic Journal of Graph Theory and Applications     Open Access   (Followers: 2)
Electronic Notes in Discrete Mathematics     Full-text available via subscription   (Followers: 2)
Elemente der Mathematik     Full-text available via subscription   (Followers: 3)
Energy for Sustainable Development     Hybrid Journal   (Followers: 9)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Ensino da Matemática em Debate     Open Access  
Entropy     Open Access   (Followers: 4)
ESAIM: Control Optimisation and Calculus of Variations     Full-text available via subscription   (Followers: 1)
European Journal of Combinatorics     Full-text available via subscription   (Followers: 4)
European Journal of Mathematics     Hybrid Journal   (Followers: 1)
European Scientific Journal     Open Access   (Followers: 2)
Experimental Mathematics     Hybrid Journal   (Followers: 3)
Expositiones Mathematicae     Hybrid Journal   (Followers: 2)
Facta Universitatis, Series : Mathematics and Informatics     Open Access  
Fasciculi Mathematici     Open Access  
Finite Fields and Their Applications     Full-text available via subscription   (Followers: 4)
Fixed Point Theory and Applications     Open Access   (Followers: 1)
Formalized Mathematics     Open Access   (Followers: 2)

        1 2 3 4 | Last

Journal Cover Boletín de la Sociedad Matemática Mexicana
  [SJR: 0.11]   [H-I: 11]   [0 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1405-213X - ISSN (Online) 2296-4495
   Published by Springer-Verlag Homepage  [2335 journals]
  • On the average value of the first n values of the Euler function
    • Abstract: We prove that the number of positive integers \(n\le x\) , such that \(\phi (1)+\phi (2)+\cdots +\phi (n)\) is a multiple of n, is less than \(x/(\log x)^{0.15742}\) for all sufficiently large x, where \(\phi \) stands for the Euler totient function.
      PubDate: 2017-03-27
       
  • On approximating the distance trisector curve
    • Abstract: Recently we have shown that the distance trisector curve is a transcendental curve. Since from the computational point of view this implies that no closed expression to describe the curve in algebraic terms can be found, it is still of interest to know how to approximate it efficiently by means of polynomial or rational functions. We discuss here some of the remarkable properties of this curve, that among other things lead to very good approximations.
      PubDate: 2017-03-27
       
  • Samuel Gitler and his influence
    • Authors: Ernesto Lupercio; Elias Micha
      Abstract: In his note we briefly analyze the rôle of the oeuvre of Mexican mathematician Samuel Gitler and his influence in twentieth and twenty-first century mathematics.
      PubDate: 2017-03-11
      DOI: 10.1007/s40590-017-0163-9
       
  • Transitivity of $$\rho _\mathfrak {R}$$ ρ R relations in hyperrings using
           geometric spaces
    • Authors: M. Shirvani; S. Mirvakili
      Abstract: In this paper, we determine a family \({\mathfrak {U}}_{\mathfrak {R}}\) of subsets of a hyperring R and sufficient conditions, such that the geometric space \((R,{\mathfrak {U}}_{\mathfrak {R}})\) is strongly transitive. Finally, we prove that in any hyperfield or any hyperring \((R,+,\cdot )\) , such that \((R,+)\) has an identity element, \(\rho _\mathfrak {R}=\rho ^*_\mathfrak {R}\) .
      PubDate: 2017-02-18
      DOI: 10.1007/s40590-017-0162-x
       
  • Remarks on the Bohr-torsion topology of a locally compact Abelian group
    • Authors: F. Javier Trigos-Arrieta
      Abstract: Denote by \({{\mathbb {T}}}\) the torus, i.e., the topological group consisting of the complex numbers of modulus 1 under multiplication. Every topological Abelian group (G, t) has associated a weaker topological group topology, denoted by \(t^+\) , defined as the weakest topology on G that makes the t-continuous homomorphisms (t-characters) \(\phi : G \rightarrow {{\mathbb {T}}}\) continuous. The topology \(t^+\) is called the Bohr topology on (G, t). Let \({{{\mathfrak {T}}}}\) denote the torsion subgroup of \({{\mathbb {T}}}\) . Then the weakest topology that makes the t-characters \(\phi : G \rightarrow {{\mathfrak {T}}}\) continuous is called the Bohr-torsion topology on (G, t) and is denoted by \(t^\oplus \) . When t is locally compact, we show that \(t^\oplus \) is Hausdorff if and only if (G, t) is zero dimensional, and if (G, t) is zero dimensional and H is a subgroup of G, then H is t-closed if and only if H is \(t^\oplus \) -closed.
      PubDate: 2017-02-17
      DOI: 10.1007/s40590-017-0161-y
       
  • Some results on n -coherent rings, n -hereditary rings and n -regular
           rings
    • Authors: Zhanmin Zhu
      Abstract: Let R be a ring and n be a positive integer. R is called left n-coherent, if every n-presented left R-module is \((n+1)\) -presented. A left R-module M is called (n, 0)-injective if Ext \(^1_R(V, M)=0\) for every n-presented module V, a right R-module F is called (n, 0)-flat if Tor \(^R_1(F, V)=0\) for every n-presented module V, a left R-module M is called (n, 0)-projective if \(\mathrm{Ext}^1_R(M, N)=0\) for any (n, 0)-injective module N, and a right R-module M is called (n, 0)-cotorsion if \(\mathrm{Ext}^1_R(F, M)=0\) for any (n, 0)-flat module F. We give some characterizations and properties of (n, 0)-projective modules and (n, 0)-cotorsion modules. n-coherent rings, n-hereditary rings and n-regular rings are characterized by (n, 0)-projective modules, (n, 0)-cotorsion modules, (n, 0)-injective modules and (n, 0)-flat modules.
      PubDate: 2017-02-14
      DOI: 10.1007/s40590-017-0160-z
       
  • EQ-algebras based on hyper EQ-algebras
    • Authors: M. Hamidi; A. Broumand Saeid
      Abstract: In this paper, we introduce a strongly regular relation on hyper EQ-algebra as a fundamental relation and study some of its properties. We construct the quotient of any hyper EQ-algebra via (regular relation) strongly regular relations. Finally, relationships between filter and EQ-filter are studied in detail.
      PubDate: 2017-01-10
      DOI: 10.1007/s40590-016-0159-x
       
  • Rings derived from strongly $$\mathcal {U}$$ U -regular relations
    • Authors: S. Mirvakili; S. M. Anvariyeh; B. Davvaz
      Abstract: This paper concerns a new relationship between hyperrings and rings. It is a continuation of ideas presented by Babaeia, Jafarpour, and Mousavi. We apply generalization of a complete part in a hyperring. We study the notion of strongly \(\mathcal {U}\) -regular relations on hyperrings and investigate some of their properties. In particular, we investigate the properties of rings derived from strongly \(\mathcal {U}\) -regular relations.
      PubDate: 2017-01-03
      DOI: 10.1007/s40590-016-0157-z
       
  • Topological cocycles
    • Authors: M. R. Molaei
      Abstract: In this essay we consider topological cocycles via semibornology and group structures. Global and local attractors via semibornological nonautonomous sets are studied. We show that global semibornological pullback attractors are compact and positively invariant. We introduce the concept of global \((g,\beta )\) pullback attractors and we show that they are also compact and positively invariant. We prove that semibornological pullback attractors are invariant objects under topological equivalencies. We present a method for finding absorbing sets when the state space of the dynamical system of a cocycle is a convex semibornological vector space.
      PubDate: 2017-01-03
      DOI: 10.1007/s40590-016-0158-y
       
  • New solvability criterion for jump problem
    • Authors: Boris A. Kats; David B. Katz
      Pages: 361 - 366
      Abstract: We study the problem to find a function holomorphic on a compact Riemann surface that is given by its jump on a non-rectifiable curve. We improve the known solvability criteria for this problem in terms of new metric characteristics of non-rectifiable curves.
      PubDate: 2016-10-01
      DOI: 10.1007/s40590-016-0100-3
      Issue No: Vol. 22, No. 2 (2016)
       
  • On convex hulls and pseudoconvex domains generated by q -plurisubharmonic
           functions, part II
    • Authors: Thomas Pawlaschyk; Eduardo S. Zeron
      Pages: 367 - 388
      Abstract: We study the properties of hulls of compact sets in \(\mathbb {C}^n\) that are generated by certain subfamilies of q-plurisubharmonic functions. We consider in particular those functions that are plurisubharmonic on the level sets of holomorphic mappings defined from \(\mathbb {C}^n\) into \(\mathbb {C}^q\) . We also compare the above-mentioned hulls against the generalised polynomially and rationally convex hulls already defined in the literature. Our main result yields that the hulls defined by q-plurisubharmonic functions or q-pseudoconvex sets are all q-maximum, so that their complement is relatively \((n{\text {-}}q{\text {-}}2)\) -pseudoconvex.
      PubDate: 2016-10-01
      DOI: 10.1007/s40590-016-0123-9
      Issue No: Vol. 22, No. 2 (2016)
       
  • C*-algebra generated by horizontal Toeplitz operators on the Fock space
    • Authors: Kevin Esmeral; Nikolai Vasilevski
      Pages: 567 - 582
      Abstract: We introduce the so-called horizontal Toeplitz operators acting on the Fock space and give an explicit description of the C*-algebra generated by them. We show that any Toeplitz operator with \(L_{\infty }\) -symbol, which is invariant under imaginary translations, is unitarily equivalent to the multiplication operator by its “spectral function”. This result is also true for the Toeplitz operators whose defining symbols are invariant under translations over any Lagrangian plane. The main result of the paper states that the corresponding spectral functions form a dense subset in the C*-algebra of bounded uniformly continuous functions with respect to the standard metric on \(\mathbb {R}^{n}\) .
      PubDate: 2016-10-01
      DOI: 10.1007/s40590-016-0110-1
      Issue No: Vol. 22, No. 2 (2016)
       
  • On Toeplitz operators on the pluriharmonic Bergman space on the Siegel
           domain
    • Authors: Maribel Loaiza; Carmen Lozano
      Pages: 583 - 604
      Abstract: We prove that Toeplitz operators, acting on the pluriharmonic Bergman space of the Siegel domain, generate commutative \(C^*\) - algebras in the following two cases: when the class of symbols are invariant functions under the action of the quasi-parabolic group of biholomorphisms of the Siegel domain and when the class of symbols consists of all invariant functions under the action of the nilpotent group of biholomorphisms of the Siegel domain.
      PubDate: 2016-10-01
      DOI: 10.1007/s40590-016-0122-x
      Issue No: Vol. 22, No. 2 (2016)
       
  • Uniformly continuous functions and quantization on the Fock space
    • Authors: Wolfram Bauer; Lewis A. Coburn
      Pages: 669 - 677
      Abstract: With a family \((\mu _t)_{t>0}\) of Gaussian probability measures we consider the scale \((H_t^2)_{>0}\) of \(\mu _t\) -square integrable entire functions on \(\mathbb {C}^n\) . Here t plays the role of Planck’s constant. For f and g in the space \(\mathrm{BUC}(\mathbb {C}^n)\) of all bounded and uniformly continuous complex valued functions on \(\mathbb {C}^n\) we show the asymptotic composition formula 1 $$\begin{aligned} \lim _{t\downarrow 0} \Vert T_f^{(t)} T_g^{(t)} -T^{(t)}_{fg} \Vert _t =0, \end{aligned}$$ where \(\Vert \cdot \Vert _t\) denotes the norm in \(\mathcal {L}(H_t^2)\) and \(T_f^{(t)}\) is the Toeplitz operator with symbol f. Different from previously known results (e.g. Borthwick, Perspectives on quantization. Contemporary mathematics, vol 214. AMS, Providence, pp 23–37, 1998; Coburn, Commun Math Phys 149:415–424, 1992) neither differentiability nor compact support of the operator symbols is assumed. We provide an example which indicates that (1) in general fails for rapidly oscillating bounded symbols.
      PubDate: 2016-10-01
      DOI: 10.1007/s40590-016-0108-8
      Issue No: Vol. 22, No. 2 (2016)
       
  • Limiting reiteration for real interpolation with logarithmic functions
    • Authors: Leo R. Ya. Doktorski
      Pages: 679 - 693
      Abstract: The real interpolation method \( {\overline{X}}_{\theta ,q,b}=(X_0,X_1)_{\theta ,q,b} \) involving iterated logarithms with any number of iterations is considered. Reiteration relations of the types \( (X_0,{\overline{X}}_{0,q,a})_{\theta ,r,b} \) and \( ({\overline{X}}_{1,q,a}X_1)_{\theta ,r,b} \) \( (0\le \theta \le 1)\) are investigated. Using any number of iterations allows in particular obtaining effects where the resulting space includes three iterated logarithms although the initial scale includes only the uniterated logarithm. Application to Lorentz–Zygmund spaces is given.
      PubDate: 2016-10-01
      DOI: 10.1007/s40590-016-0116-8
      Issue No: Vol. 22, No. 2 (2016)
       
  • On certain non-linear differential polynomial sharing a non-zero
           polynomial
    • Authors: Abhijit Banerjee; Sujoy Majumder
      Abstract: With the notion of weighted sharing of values we investigate the possible relation between two meromorphic functions when \(f^{n}P(f)f^{(k)}\) and \(g^{n}P(g)g^{(k)}\) share a non-zero polynomial. The results obtained in this paper improve, generalize and rectify a recent one of Cao and Zhang (J Inequal Appl 1:100, 2012).
      PubDate: 2016-12-05
      DOI: 10.1007/s40590-016-0156-0
       
  • Determination of the 2-primary components of the 32-stem homotopy groups
           of $$S^n$$ S n
    • Abstract: We determine the 2-primary components of the 32-stem homotopy groups of spheres. The method is based on the classical one including the Toda’s composition methods.
      PubDate: 2016-11-04
      DOI: 10.1007/s40590-016-0154-2
       
  • Periodic solutions and stability in a nonlinear neutral system of
           differential equations with infinite delay
    • Authors: Mouataz Billah Mesmouli; Abdelouaheb Ardjouni; Ahcene Djoudi
      Abstract: In this paper, we study the existence of periodic solutions of the nonlinear neutral system of differential equations $$\begin{aligned} \frac{\mathrm{d}}{\mathrm{d}t}x\left( t\right) =A\left( t\right) x\left( t\right) +\frac{\mathrm{d}}{\mathrm{d}t} Q\left( t,x\left( t-g\left( t\right) \right) \right) +\int _{-\infty }^{t}D\left( t,s\right) F\left( x\left( s\right) \right) \mathrm{d}s. \end{aligned}$$ Using Krasnoselskii’s fixed point theorem, we obtain the existence of periodic solution and by contraction mapping principle we obtain the uniqueness of periodic solution and stability of the zero solution. Our results extend some earlier publications.
      PubDate: 2016-10-28
      DOI: 10.1007/s40590-016-0155-1
       
  • On the theory of unconditional bases of Hilbert spaces formed by entire
           vector-functions
    • Authors: Gennadiy Gubreev; Anna Tarasenko
      Abstract: A quite general theorems on unconditional bases in separable Hilbert spaces, given in terms of values of entire operator valued vector-functions, were established in the papers [2–4]. In the present paper, we give a detailed analysis of the hypothesis of these theorems. We present examples of various classes of vector-functions that satisfy some of the hypothesis of the above theorems. On the other hand, we show that there exist natural classes of vector-functions that do not satisfy some of the hypothesis of Theorem A.
      PubDate: 2016-10-25
      DOI: 10.1007/s40590-016-0153-3
       
  • Graph lattice: random walk and combinatorial identities
    • Authors: I. M. Erusalimskiy
      Abstract: Graph lattice has vertices at points with non-negative integer coordinates. From each vertex we have two edges: horizontal and vertical neighboring vertices (right and top). In this paper, we considered the problem of random walk on the vertices of the graph lattice without limitation on the reachability and with two types of limitations on reachability—mixed and magnetic. The set of edges of the graph with mixed reachability U is a union of disjoint non-empty sets  \(U_R\) and  \(U_Z\) . Permitted path on the graph with mixed reachability is the path wherein the edges from the set  \(U_Z\) are thinned by the edges from the set  \(U_R\) , i.e. the edges from the set  \(U_Z\) on the path are not adjacent. As a consequence of the consideration of this problem, we have obtained new proof of some combinatorial identities.
      PubDate: 2016-05-12
      DOI: 10.1007/s40590-016-0115-9
       
 
 
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