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MATHEMATICS (742 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: 33)
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: 11)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 4)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 9)
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: 14)
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 Nonlinear Analysis     Hybrid Journal  
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: 13)
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: 10)
Anadol University Journal of Science and Technology B : Theoritical Sciences     Open Access  
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  
Annals of West University of Timisoara - Mathematics and Computer Science     Open Access  
Annuaire du Collège de France     Open Access   (Followers: 6)
ANZIAM Journal     Open Access   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applications of Mathematics     Hybrid Journal   (Followers: 2)
Applied Categorical Structures     Hybrid Journal   (Followers: 3)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 14)
Applied Mathematics     Open Access   (Followers: 3)
Applied Mathematics     Open Access   (Followers: 7)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 8)
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: 6)
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: 21)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
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)
Biomath     Open Access  
BIT Numerical Mathematics     Hybrid Journal  
Boletim Cearense de Educação e História da Matemática     Open Access  
Boletim de Educação Matemática     Open Access  
Boletín de la Sociedad Matemática Mexicana     Hybrid Journal  
Bollettino dell'Unione Matematica Italiana     Full-text available via subscription   (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: 2)
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 Advanced Mathematical Sciences     Open Access  
Communications in Combinatorics and Optimization     Open Access  
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 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: 3)
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: 8)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 9)
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: 8)
Czechoslovak Mathematical Journal     Hybrid Journal   (Followers: 1)
Demographic Research     Open Access   (Followers: 12)
Demonstratio Mathematica     Open Access  
Dependence Modeling     Open Access  
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 31)
Developments in Clay Science     Full-text available via subscription   (Followers: 1)
Developments in Mineral Processing     Full-text available via subscription   (Followers: 3)
Dhaka University Journal of Science     Open Access  
Differential Equations and Dynamical Systems     Hybrid Journal   (Followers: 4)
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  
Econometrics     Open Access   (Followers: 2)
Edited Series on Advances in Nonlinear Science and Complexity     Full-text available via subscription  
Educação Matemática Debate     Open Access  
EduMatSains     Open Access  
Electronic Journal of Combinatorics     Open Access  

        1 2 3 4 | Last

Journal Cover
Bulletin of the Malaysian Mathematical Sciences Society
Journal Prestige (SJR): 0.626
Citation Impact (citeScore): 1
Number of Followers: 0  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0126-6705 - ISSN (Online) 2180-4206
Published by Springer-Verlag Homepage  [2352 journals]
  • Capacity of a Condenser in the Heisenberg Group
    • Authors: Najoua Gamara; Akram Makni
      Abstract: We give new estimates on the capacity of a condenser in the first Heisenberg group. As an application, we establish new lower and upper bounds for the first eigenvalue of the Kohn–Laplace operator for a regular bounded open domain of the Heisenberg group.
      PubDate: 2018-04-23
      DOI: 10.1007/s40840-018-0628-7
  • The Jacobian Conjecture and Injectivity Conditions
    • Authors: Saminathan Ponnusamy; Victor V. Starkov
      Abstract: One of the aims of this article is to provide a class of polynomial mappings for which the Jacobian conjecture is true. Also, we state and prove several global univalence theorems and present a couple of applications of them.
      PubDate: 2018-04-18
      DOI: 10.1007/s40840-018-0626-9
  • Fundamental Theorems of Doi–Hopf Modules in a Nonassociative Setting
    • Authors: J. N. Alonso Álvarez; J. M. Fernández Vilaboa; R. González Rodríguez
      Abstract: In this paper, we introduce the notion of weak nonassociative Doi–Hopf module and give the Fundamental Theorem of Hopf modules in this setting. Also, we prove that there exists a categorical equivalence that admits as particular instances the ones constructed in the literature for Hopf algebras, weak Hopf algebras, Hopf quasigroups and weak Hopf quasigroups.
      PubDate: 2018-04-16
      DOI: 10.1007/s40840-018-0624-y
  • Multiplicity of Positive Solutions for Schrödinger–Poisson Systems with
           a Critical Nonlinearity in $$\mathbb {R}^3$$ R 3
    • Authors: Weihong Xie; Haibo Chen; Hongxia Shi
      Abstract: This paper is dedicated to studying the multiplicity of positive solutions for the following Schrödinger–Poisson problem $$\begin{aligned} \left\{ \begin{array}{ll} -\Delta u+u+\phi u=\lambda Q(x) u ^{q-2}u+ K(x) u ^4u, \quad &{}\hbox {in} \ \mathbb {R}^3,\\ -\Delta \phi =u^2, \quad &{}\hbox {in} \ \mathbb {R}^3,\\ \end{array}\right. \end{aligned}$$ where \(4<q<6 \) or \(q=2\) , \(\lambda >0\) is a parameter, K(x) and Q(x) satisfy some mild assumptions. With minimax theorems and Ljusternik–Schnirelmann theory, we investigate the relation between the number of positive solutions and the topology of the set where K(x) attains its global maximum for small \(\lambda \) .
      PubDate: 2018-04-11
      DOI: 10.1007/s40840-018-0623-z
  • Retraction Note to: Toeplitz Matrices Whose Elements are the Coefficients
           of Starlike and Close-to-Convex Functions
    • Authors: D. K. Thomas; S. Abdul Halim
      Abstract: The authors have retracted this article because the article contains major flaws in the proof of the main results. The results of the paper are invalid, since the assumption that the functionals considered are rotationally invariant is not valid. All authors have agreed to this retraction.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-018-0620-2
  • Edge Colorings of Planar Graphs Without 6-Cycles with Three Chords
    • Authors: Wenwen Zhang; Jian-Liang Wu
      Abstract: A graph G is of class 1 if its edges can be colored with k colors such that adjacent edges receive different colors, where k is the maximum degree of G. It is proved here that every planar graph is of class 1 if its maximum degree is at least 6 and any 6-cycle contains at most two chords.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0376-5
  • Note on the Distribution Composition $$(x_+^\mu )^\lambda $$ ( x + μ ) λ
    • Authors: Limonka Lazarova; Biljana Jolevska-Tuneska; İnci Aktürk; Emin Özc̣ağ
      Abstract: The composition of the distributions \(x^\lambda \) and \(x_+^\mu \) is evaluated for \(\lambda = -1,-2,\ldots \quad \mu >0\) and \(\lambda \mu \in {{\mathbb {Z}}}^- .\) Further results are deduced.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0342-2
  • Further Results on Distance Estrada Index of Random Graphs
    • Authors: Yilun Shang
      Abstract: Let G be a simple connected graph on n vertices. The distance Estrada index DEE(G) of G is defined as the sum of \(e^{\lambda _i(D)}\) over \(1\le i\le n\) , where \(\lambda _1(D),\lambda _2(D),\) \(\ldots ,\) \(\lambda _n(D)\) are the eigenvalues of its distance matrix D. In this paper, we establish lower and upper bounds to DEE(G) for almost all bipartite graphs G.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0306-6
  • A Class of Locally Conformal Almost Cosymplectic Manifolds
    • Authors: Fortuné Massamba; Ange Maloko Mavambou
      Abstract: In this paper, we study a class of almost contact manifolds, namely locally conformal almost manifolds. We investigate subclasses of such manifolds and prove that some of them contain the class of bundle-like metric structures. Under some conditions, we prove that the class of conformal changes of almost cosymplectic structures is a subclass of (almost)-cosymplectic structures. Examples are also obtained.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0309-3
  • Some Reversed and Refined Callebaut Inequalities Via Kontorovich Constant
    • Authors: Mojtaba Bakherad
      Abstract: In this paper, we employ some operator techniques to establish some refinements and reverses of the Callebaut inequality involving the geometric mean and Hadamard product under some mild conditions. In particular, we show $$\begin{aligned}&K\left( \frac{M^{2t-1}}{m^{2t-1}},2\right) ^{r{^\prime }} \sum _{j=1}^n(A_j\sharp _{s}B_j)\circ \sum _{j=1}^n(A_j\sharp _{1-s}B_j)\\&\qquad +\left( \frac{t-s}{t-1/2}\right) \left( \sum _{j=1}^n(A_j\sharp _{t}B_j)\circ \sum _{j=1}^n(A_j\sharp _{1-t}B_j) \!-\!\sum _{j=1}^n(A_j\sharp B_j)\circ \sum _{j=1}^n(A_j\sharp B_j)\!\right) \\&\quad \le \sum _{j=1}^n(A_j\sharp _{t}B_j)\circ \sum _{j=1}^n(A_j\sharp _{1-t} B_j), \end{aligned}$$ where \(A_j, B_j\in {\mathbb {B}}({\mathscr {H}})\,\,(1\le j\le n)\) are positive operators such that \(0<m{^\prime } \le B_j\le m <M \le A_j\le M{^\prime }\,\,(1\le j\le n)\) , either \(1\ge t\ge s>{\frac{1}{2}}\) or \(0\le t\le s<\frac{1}{2}\) , \(r{^\prime }=\min \left\{ \frac{t-s}{t-1/2},\frac{s-1/2}{t-1/2}\right\} \) and \(K(t,2)=\frac{(t+1)^2}{4t}\,\,(t>0)\) .
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0364-9
  • Wold-Type Decompositions for a Commutative Pair of Noncommutative
           Semigroups of Isometries
    • Authors: Tudor Bînzar; Cristian Lăzureanu
      Abstract: In this paper, a pair of noncommutative isometric semigroups on a Hilbert space is considered. The existence and uniqueness of Wold-type decompositions for this pair are studied and connections with the noncommutative Wold decomposition for the product semigroup generated by this pair are given. Also, characterizations for the product semigroup to be a standard semigroup are presented.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0379-2
  • Weak Finite Intersection Characterizations of Existence in Optimization
    • Authors: Phan Quoc Khanh; Vo Si Trong Long
      Abstract: We propose a pure topological notion of a finite-intersection map (FI-map), which captures the idea of a typical generalized KKM-map, with no use of any generalized convexity structure and prove its full characterizations in terms of recent generalized KKM and connectedness structures. We establish an intersection point theorem in terms of FI-maps. Then, a half of the paper is devoted to apply this result to obtain characterizations of the existence of solutions in optimization. First, we discuss a general model of variational relations. Then, we move on to more particular, but typical and important cases: equilibrium problems, saddle points, constrained minimization, and Nash equilibria. We include discussions and examples to illustrate that our results improve or extend many recent contributions in the literature.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0370-y
  • Inferences in Constant-Partially Accelerated Life Tests Based on
           Progressive Type-II Censoring
    • Authors: Rashad M. EL-Sagheer
      Abstract: Accelerated life testing is widely used in product life testing experiments since it provides significant reduction in time and cost of testing. In this article, we assume that the lifetime of items under use condition follows the two-parameter distributions having power hazard function, and partially accelerated life tests based on progressive type-II censored samples are considered. The maximum likelihood, Bayes, and parametric bootstrap methods are used for estimating the unknown parameters. Based on normal approximation to the asymptotic distribution of MLEs, the approximate confidence intervals for the parameters are derived. Two bootstrap confidence intervals are also proposed. The classical Bayes estimates cannot be obtained in explicit form, so we propose to apply the Markov chain Monte Carlo (MCMC) technique. Gibbs within the Metropolis–Hasting algorithm has been applied to generate MCMC samples from the posterior density function. Based on the generated samples, the Bayes estimates and the highest posterior density credible intervals of the unknown parameters have been computed. Finally, analysis of a simulated data set has also been presented to illustrate the proposed estimation methods developed here.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0311-9
  • One-Step Iterations for a Finite Family of Generalized Nonexpansive
           Mappings in CAT(0) Spaces
    • Authors: Hafiz Fukhar-ud-din; Khairul Saleh
      Abstract: We study a one-step iterative scheme to establish strong convergence theorems and \(\triangle \) -convergence theorems for a finite family of generalized nonexpansive mappings on a nonlinear domain. Our results generalize and extend several relevant results in the literature.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0310-x
  • Existence Results for a Coupled System of Perturbed Functional
           Differential Inclusions in Banach Algebras
    • Authors: Aref Jeribi; Najib Kaddachi; Bilel Krichen
      Abstract: In this paper, we establish some new fixed point theorems for a \(2\times 2\) block operator matrix defined on nonempty, bounded, closed, and convex subsets of Banach algebras, where the inputs are multi-valued mappings. The obtained results are then applied to a coupled system of perturbed functional differential inclusions of initial and boundary value problems in order to prove the existence of solutions under a Carathéodory condition.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0374-7
  • An Improvement to the Homotopy Perturbation Method for Solving Nonlinear
           Duffing’s Equations
    • Authors: A. R. Vahidi; E. Babolian; Z. Azimzadeh
      Abstract: In this paper, a new form of the homotopy perturbation method has been adopted for solving nonlinear Duffing’s equations, which yields the Maclaurin series of the exact solution. The Laplace transformation is applied to the truncated Maclaurin series, and then the Padé approximation with fast convergence rate and high accuracy is used for the solution derived from the Laplace transformation. Illustrative examples are given to demonstrate the efficiency and the simplicity of the proposed method.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-015-0191-4
  • On the Cayley Graphs of Completely Simple Semigroups
    • Authors: Bahman Khosravi
      Abstract: In this paper first we study and characterize the Cayley graph of Rees matrix semigroups (completely simple semigroups). Then we investigate Cayley D-saturated property of these graphs and we study the Cayley D-saturated property of Rees matrix semigroups.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0361-z
  • Local Descriptions of Roots of Cubic Equations over P-adic Fields
    • Authors: Mansoor Saburov; Mohd Ali Khameini Ahmad
      Abstract: One of the most frequently asked question in the p-adic lattice models of statistical mechanics is that whether a root of a polynomial equation belongs to domains \({\mathbb {Z}}_p^{*}, \ {\mathbb {Z}}_p{\setminus }{\mathbb {Z}}_p^{*}, \ {\mathbb {Z}}_p, \ {\mathbb {Q}}_p{\setminus }{\mathbb {Z}}_p^{*}, \ {\mathbb {Q}}_p{\setminus }({\mathbb {Z}}_p{\setminus }{\mathbb {Z}}_p^{*}), \ {\mathbb {Q}}_p{\setminus }{\mathbb {Z}}_p, \ {\mathbb {Q}}_p \) or not. However, this question was open even for lower-degree polynomial equations. In this paper, we give local descriptions of roots of cubic equations over the p-adic fields for \(p>3\) .
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0401-8
  • Vector Exponential Penalty Function Method for Nondifferentiable
           Multiobjective Programming Problems
    • Authors: Tadeusz Antczak
      Abstract: In this paper, a new vector exponential penalty function method for nondifferentiable multiobjective programming problems with inequality constraints is introduced. First, the case when a sequence of vector penalized optimization problems with vector exponential penalty function constructed for the original multiobjective programming problem is considered, and the convergence of this method is established. Further, the exactness property of a vector exact penalty function method is defined and analyzed in the context of the introduced vector exponential penalty function method. Conditions are given guaranteeing the equivalence of the sets of (weak) Pareto solutions of the considered nondifferentiable multiobjective programming problem and the associated vector penalized optimization problem with the vector exact exponential penalty function. This equivalence is established for nondifferentiable vector optimization problems with inequality constraints in which involving functions are r-invex.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0340-4
  • Subscalarity, Invariant, and Hyperinvariant Subspaces for Upper Triangular
           Operator Matrices
    • Authors: Salah Mecheri
      Abstract: In this paper, we introduce the class of quasi-nM-hyponormal operators and study various properties. We show that every quasi-nM-hyponormal operator is subscalar of order 2n; in particular, every M-hyponormal operator is subscalar of order two. Consequently, if the spectrum of T has a nonempty interior in \(\mathbb {C}\) , then T has a nontrivial invariant subspace. We also examine the hyperinvariant subspace problem for quasi-nM-hyponormal operators. Finally, we consider some of the spectral properties of this class and show that they share many spectral properties with normal operators on Hilbert spaces, mainly concerning Fredholm theory and local spectral theory. We are primarily interested in isolated points of the spectra of quasi-nM-hyponormal operators as well as the isolated points of the approximate point spectra. These properties lead to the concept of a polaroid-type operator, which when combined with the single-valued extension property, an important property in local spectral theory, produces a general framework for several versions of Weyl-type theorems.
      PubDate: 2018-04-01
      DOI: 10.1007/s40840-016-0377-4
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