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MATHEMATICS (714 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 4)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 4)
Academic Voices : A Multidisciplinary Journal     Open Access   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 7)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 15)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 3)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 6)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 29)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1)
Acta Mathematica     Hybrid Journal   (Followers: 12)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 10)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 3)
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: 19)
Advances in Decision Sciences     Open Access   (Followers: 3)
Advances in Difference Equations     Open Access   (Followers: 3)
Advances in Fixed Point Theory     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 13)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 3)
Advances in Materials Science     Open Access   (Followers: 14)
Advances in Mathematical Physics     Open Access   (Followers: 4)
Advances in Mathematics     Full-text available via subscription   (Followers: 11)
Advances in Numerical Analysis     Open Access   (Followers: 5)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Pure and Applied Mathematics     Hybrid Journal   (Followers: 6)
Advances in Pure Mathematics     Open Access   (Followers: 6)
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: 11)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 1)
Al-Jabar : Jurnal Pendidikan Matematika     Open Access   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 6)
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: 11)
Algorithms Research     Open Access   (Followers: 1)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 5)
American Journal of Mathematical Analysis     Open Access  
American Journal of Mathematics     Full-text available via subscription   (Followers: 6)
American Journal of Operations Research     Open Access   (Followers: 5)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 8)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access   (Followers: 1)
Analysis and Applications     Hybrid Journal   (Followers: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 5)
Analysis Mathematica     Full-text available via subscription  
Analysis. International mathematical journal of analysis and its applications     Hybrid Journal   (Followers: 2)
Annales Mathematicae Silesianae     Open Access  
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica     Open Access  
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1)
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Data Science     Hybrid Journal   (Followers: 12)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 6)
Annals of Mathematics     Full-text available via subscription   (Followers: 1)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12)
Annals of Pure and Applied Logic     Open Access   (Followers: 3)
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)
ANZIAM Journal     Open Access   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applications of Mathematics     Hybrid Journal   (Followers: 2)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Mathematics     Open Access   (Followers: 3)
Applied Mathematics     Open Access   (Followers: 7)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 6)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal  
Applied Mathematics Letters     Full-text available via subscription   (Followers: 2)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 1)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
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: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Armenian Journal of Mathematics     Open Access  
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites     Open Access   (Followers: 20)
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: 4)
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: 1)
Basin Research     Hybrid Journal   (Followers: 5)
BIBECHANA     Open Access   (Followers: 2)
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: 20)
Bruno Pini Mathematical Analysis Seminar     Open Access  
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 12)
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: 1)
Bulletin of Symbolic Logic     Full-text available via subscription   (Followers: 2)
Bulletin of the Australian Mathematical Society     Full-text available via subscription   (Followers: 1)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 4)
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: 19)
Carpathian Mathematical Publications     Open Access   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
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: 1)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Collectanea Mathematica     Hybrid Journal  
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
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: 2)
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: 8)
Compositio Mathematica     Full-text available via subscription   (Followers: 1)
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: 5)
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: 8)
Concrete Operators     Open Access   (Followers: 5)
Confluentes Mathematici     Hybrid Journal  
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal  
Cryptography and Communications     Hybrid Journal   (Followers: 13)
Cuadernos de Investigación y Formación en Educación Matemática     Open Access  
Cubo. A Mathematical Journal     Open Access  
Current Research in Biostatistics     Open Access   (Followers: 9)
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: 29)
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: 3)
Differentsial'nye Uravneniya     Open Access  
Discrete Mathematics     Hybrid Journal   (Followers: 8)
Discrete Mathematics & Theoretical Computer Science     Open Access  
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  
Dnipropetrovsk University Mathematics Bulletin     Open Access  
Doklady Akademii Nauk     Open Access  
Doklady Mathematics     Hybrid Journal  
Duke Mathematical Journal     Full-text available via subscription   (Followers: 1)
Eco Matemático     Open Access  
Edited Series on Advances in Nonlinear Science and Complexity     Full-text available via subscription  
Electronic Journal of Combinatorics     Open Access  
Electronic Journal of Differential Equations     Open Access  
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: 4)
Energy for Sustainable Development     Hybrid Journal   (Followers: 9)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  

        1 2 3 4 | Last

Journal Cover
Boletín de la Sociedad Matemática Mexicana
Number of Followers: 0  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1405-213X - ISSN (Online) 2296-4495
Published by Springer-Verlag Homepage  [2348 journals]
  • Co-maximal ideal graphs of matrix algebras
    • Authors: B. Miraftab; R. Nikandish
      Pages: 1 - 10
      Abstract: Let R be a ring with unity. The co-maximal ideal graph of R, denoted by \(\Gamma (R)\) , is a graph whose vertices are all non-trivial left ideals of R, and two distinct vertices \(I_1\) and \(I_2\) are adjacent if and only if \(I_1 + I_2 = R\) . In this paper, some results on the co-maximal ideal graphs of matrix algebras are given. For instance, we determine the domination number, the clique number and a lower bound of the independence number of \(\Gamma (M_n(\mathbb {F}_q))\) , where \(M_n(\mathbb {F}_q)\) is the ring of \(n\times n\) matrices over the finite field \(\mathbb {F}_q\) . Furthermore, we characterize all rings (not necessarily commutative) whose domination numbers of their co-maximal ideal graphs are finite. Among other results, we show that if \(\Gamma (R)\cong \Gamma (M_n(\mathbb {F}_q))\) , where \(n\ge 2\) is a positive integer and R is a ring, then \(R\cong M_n(\mathbb {F}_q)\) . Also, it is proved that if R and \(R'\) are two finite reduced rings and \(\Gamma (M_m(R))\cong \Gamma (M_n(R'))\) , for some positive integers \(m,n\ge 2\) , then \(m=n\) and \(R\cong R'\) .
      PubDate: 2018-04-01
      DOI: 10.1007/s40590-016-0141-7
      Issue No: Vol. 24, No. 1 (2018)
  • EQ-algebras based on hyper EQ-algebras
    • Authors: M. Hamidi; A. Broumand Saeid
      Pages: 11 - 35
      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: 2018-04-01
      DOI: 10.1007/s40590-016-0159-x
      Issue No: Vol. 24, No. 1 (2018)
  • Arithmetic properties of bipartitions with designated summands
    • Authors: M. S. Mahadeva Naika; C. Shivashankar
      Pages: 37 - 60
      Abstract: In 2002 Andrews, Lewis and Lovejoy introduced partition function PD(n), the number of partitions of n with designated summands and using modular forms they obtained many congruences modulo 3 and powers of 2. For example, they proved \(PD(3n+2)\equiv 0 \pmod {3}\) . In this paper, we study various arithmetic properties of \(PD_2(n)\) modulo 3 and powers of 2, where \(PD_2(n)\) denotes the number of bipartitions of n with designated summands. We obtain congruences like \(PD_2(3^{\alpha +3}(3n+2))\equiv 0 \pmod {3}\) , \(PD_2(3^{\alpha +3}(6n+4))\equiv 0 \pmod {3}\) , \(PD_2(24n+15)\equiv 0\pmod {2^5}\) , \(PD_2(24n+23)\equiv 0\pmod {2^5}\) , \(PD_2(24n+12)\equiv 0\pmod {12}\) and \(PD_2(18n+15)\equiv 0\pmod {48}\) .
      PubDate: 2018-04-01
      DOI: 10.1007/s40590-016-0140-8
      Issue No: Vol. 24, No. 1 (2018)
  • Indecomposable cycles and arithmetic normal functions
    • Authors: José Jaime Hernández Castillo
      Pages: 61 - 79
      Abstract: We give conditions to determine if a cycle is indecomposable in the higher Chow group \(\text {CH}^{r}(X,m;\mathbb {Q})\) , for X a complex smooth projective variety. We show that the primitive part of topological invariant associated with an arithmetic normal function of a cycle is related to its decomposability.
      PubDate: 2018-04-01
      DOI: 10.1007/s40590-016-0146-2
      Issue No: Vol. 24, No. 1 (2018)
  • Some results on n -coherent rings, n -hereditary rings and n -regular
    • Authors: Zhanmin Zhu
      Pages: 81 - 94
      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: 2018-04-01
      DOI: 10.1007/s40590-017-0160-z
      Issue No: Vol. 24, No. 1 (2018)
  • An approach to quasipolarity for rings along nilpotent elements
    • Authors: Tugce Pekacar Calci; Abdullah Harmanci; Burcu Ungor
      Pages: 95 - 106
      Abstract: In this paper, we deal with a new approach to quasipolarity notion for rings, namely an element a of a ring R is called weakly nil-quasipolar if there exists \(p^2 = p\in comm^2(a)\) such that \(a + p\) or \(a-p\) is nilpotent, and the ring R is called weakly nil-quasipolar if every element of R is weakly nil-quasipolar. The class of weakly nil-quasipolar rings lies properly between the classes of nil-quasipolar rings and quasipolar rings. Although it is an open problem whether strongly clean (even quasipolar) rings have stable range one, we show that there is an affirmative answer for weakly nil-quasipolar rings. It is also proved that if R is a weakly nil-quasipolar NI ring, then R / N(R) is commutative. Moreover, we consider the question of when certain \(2 \times 2\) matrices over a commutative local ring is weakly nil-quasipolar.
      PubDate: 2018-04-01
      DOI: 10.1007/s40590-016-0145-3
      Issue No: Vol. 24, No. 1 (2018)
  • Rings derived from strongly $$\mathcal {U}$$ U -regular relations
    • Authors: S. Mirvakili; S. M. Anvariyeh; B. Davvaz
      Pages: 107 - 121
      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: 2018-04-01
      DOI: 10.1007/s40590-016-0157-z
      Issue No: Vol. 24, No. 1 (2018)
  • A characterization of linear groups $$L_3(q)$$ L 3 ( q ) by their
           character degree graphs and orders
    • Authors: Runshi Zhang; Shitian Liu
      Pages: 123 - 131
      Abstract: Let \(L_n(q)\) be the projective special linear group of degree n over a finite field of order q. In this paper, the projective special linear group \(L_3(q)\) , where \(q\in \{5,7,8,9\}\) is studied using degree graph and its order.
      PubDate: 2018-04-01
      DOI: 10.1007/s40590-016-0152-4
      Issue No: Vol. 24, No. 1 (2018)
  • On metric semigroups-valued functions of bounded Riesz- $$\Phi $$ Φ
           -variation in several variables
    • Authors: M. Bracamonte; J. Ereú; J. Giménez; N. Merentes
      Pages: 133 - 153
      Abstract: Using classical techniques related to the so-called Hardy–Vitali variation, we present the class of X-valued functions of bounded \(\Phi \) -variation in several variables, where \((X,d,+ )\) is a metric semigroup. We exhibit some of the main properties of this class; among them, we show that this class can be made into a normed space and present a counterpart of the renowned Riesz’s Lemma for the case in which \(X=\mathbb {R}\) with its usual metric.
      PubDate: 2018-04-01
      DOI: 10.1007/s40590-016-0138-2
      Issue No: Vol. 24, No. 1 (2018)
  • On certain non-linear differential polynomial sharing a non-zero
    • Authors: Abhijit Banerjee; Sujoy Majumder
      Pages: 155 - 180
      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: 2018-04-01
      DOI: 10.1007/s40590-016-0156-0
      Issue No: Vol. 24, No. 1 (2018)
  • On the zeros of the Pearcey integral and a Rayleigh-type equation
    • Authors: Gerardo Hernández-del-Valle
      Pages: 203 - 217
      Abstract: In this work we find a sequence of functions \(f_n\) at which the integral 1 $$\begin{aligned} v(t,x)=\int _{-\infty }^{\infty }e^{i\lambda x-\lambda ^2t/2-\lambda ^4/4}\mathrm{d}\lambda \end{aligned}$$ is identically zero for all \(t\ge 0\) , that is $$\begin{aligned} v(t,f_n(t))=0\qquad \forall t\ge 0. \end{aligned}$$ The function v, after proper change of variables and rotation of the path of integration, is known as the Pearcey integral or Pearcey function, indistinctly. We also show that each \(f_n\) is expressed in terms of a second order non-linear ODE, which turns out to be of the Rayleigh-type. Furthermore, the initial conditions which uniquely determine each \(f_n\) , depend on the zeros of an Lévy stable function of order 4 defined as $$\begin{aligned} \phi (x)=\int _{-\infty }^{\infty }e^{i\lambda x-\lambda ^4/4}\mathrm{d}\lambda . \end{aligned}$$ As a byproduct of these facts, we develop a methodology to find a class of functions which solve the moving boundary problem of the heat equation. To this end, we make use of generalized Airy functions, which in some particular cases fall within the category of functions with infinitely many real zeros, studied by Pólya.
      PubDate: 2018-04-01
      DOI: 10.1007/s40590-016-0142-6
      Issue No: Vol. 24, No. 1 (2018)
  • ( p ,  q )-Beta functions and applications in approximation
    • Authors: Gradimir V. Milovanović; Vijay Gupta; Neha Malik
      Pages: 219 - 237
      Abstract: In the present paper, we consider (p, q)-analogue of the beta operators and using it, we propose the integral modification of the generalized Bernstein polynomials. We estimate some direct results on local and global approximation. Also, we illustrate some graphs for the convergence of (p, q)-Bernstein–Durrmeyer operators for different values of the parameters p and q using Mathematica package.
      PubDate: 2018-04-01
      DOI: 10.1007/s40590-016-0139-1
      Issue No: Vol. 24, No. 1 (2018)
  • Periodic solutions and stability in a nonlinear neutral system of
           differential equations with infinite delay
    • Authors: Mouataz Billah Mesmouli; Abdelouaheb Ardjouni; Ahcene Djoudi
      Pages: 239 - 255
      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: 2018-04-01
      DOI: 10.1007/s40590-016-0155-1
      Issue No: Vol. 24, No. 1 (2018)
  • Topological cocycles
    • Authors: M. R. Molaei
      Pages: 257 - 267
      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: 2018-04-01
      DOI: 10.1007/s40590-016-0158-y
      Issue No: Vol. 24, No. 1 (2018)
  • On the theory of unconditional bases of Hilbert spaces formed by entire
    • Authors: Gennadiy Gubreev; Anna Tarasenko
      Pages: 269 - 278
      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: 2018-04-01
      DOI: 10.1007/s40590-016-0153-3
      Issue No: Vol. 24, No. 1 (2018)
  • Asymptotic analysis of non-periodical cointegration with high seasonals
    • Authors: David A. Dickey; Graciela González-Farías; Nelson Muriel
      Abstract: Cointegration tests are studied for seasonal time series with large periods. The study is performed asymptotically as the period tends to infinity, which is shown to allow a simple limit distribution to be established. These results offer a simple diagnostic tool for cointegration when the seasonal period is expected to be large, and its critical values do not depend on the form of the deterministic components present in the model. An application to climatic factors and outbreaks of dengue in Mexico illustrates the methods.
      PubDate: 2018-04-25
      DOI: 10.1007/s40590-018-0201-2
  • On the singular points of the orbifolds arising from integral, ternary
           quadratic forms
    • Authors: José María Montesinos-Amilibia
      Abstract: Mennicke (Proc R Soc Edinb Sect A 67:309–352, 1963; Proc R Soc Edinb Sect A 88:151–157, 1981) investigated the number of conic points with isotropies of orders 3,  4 and 6 that can appear in the orientable twofold orbifold covering of the orbifold \(Q_{f}\) associated with an integral ternary quadratic form. Mennicke made essential use of a theorem of Jones (The Arithmetic Theory of Quadratic Forms. The Carus Mathematical Monographs, vol. 10. MAA, Baltimore, 1950, Theorem 86). In this paper we revisit Mennicke’s results and we extend them to \(Q_{f},\) that is, even when \(Q_{f}\) is non-orientable. Our method is new and independent of Jones’ Theorem. We also study the possible cusp points.
      PubDate: 2018-04-23
      DOI: 10.1007/s40590-018-0199-5
  • Three-point boundary value problems in Banach spaces
    • Authors: Dionicio Pastor Dallos Santos
      Abstract: Using degree for \(\alpha \) -condensing maps, we obtain the existence of at least one solution for nonlinear boundary value problems $$\begin{aligned} \left\{ \begin{array}{lll} (\varphi (u' ))' = f(t,u,u') &{} &{} \\ u(0)=u(1)=u'(0), &{} &{} \quad \quad \end{array}\right. \end{aligned}$$ where \(\varphi : X\rightarrow X \) is a linear homeomorphism, \(f:\left[ 0, 1\right] \times X \times X \rightarrow X \) is a continuous function and X is a real Banach space.
      PubDate: 2018-04-20
      DOI: 10.1007/s40590-018-0200-3
  • On some subfamilies of holomorphic mappings associated with symmetrical
    • Authors: Muhammad Arif; Shahid Mahmood; Rafi Ullah
      Abstract: In this paper, we define two families of analytic functions using the concept of the starlikeness with respect to symmetrical points, Janowski functions and functions of bounded boundary rotation. We study here integral representation theorem, coefficient bounds, coefficient difference and arc-length problem of the newly defined class.
      PubDate: 2018-04-16
      DOI: 10.1007/s40590-018-0198-6
  • Quantitative uncertainty principles for the Weinstein transform
    • Authors: A. Abouelaz; A. Achak; R. Daher; N. Safouane
      Abstract: The Weinstein transform satisfies some uncertainty principles in a similar way to the Euclidean Fourier transform. Donoho–Stark’s uncertainty principle is obtained for the Weinstein transform.
      PubDate: 2018-04-11
      DOI: 10.1007/s40590-018-0197-7
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