Subjects -> MATHEMATICS (Total: 1118 journals)
    - APPLIED MATHEMATICS (92 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (819 journals)
    - MATHEMATICS (GENERAL) (45 journals)
    - NUMERICAL ANALYSIS (26 journals)
    - PROBABILITIES AND MATH STATISTICS (113 journals)

MATHEMATICS (819 journals)                  1 2 3 4 5 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 5)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 3)
Accounting Perspectives     Full-text available via subscription   (Followers: 9)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 17)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 5)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 9)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 44)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 2)
Acta Mathematica     Hybrid Journal   (Followers: 11)
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: 13)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 8)
Advances in Complex Systems     Hybrid Journal   (Followers: 12)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 23)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 5)
Advances in Fixed Point Theory     Open Access   (Followers: 9)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 22)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 10)
Advances in Materials Science     Open Access   (Followers: 22)
Advances in Mathematical Physics     Open Access   (Followers: 10)
Advances in Mathematics     Full-text available via subscription   (Followers: 22)
Advances in Numerical Analysis     Open Access   (Followers: 8)
Advances in Operations Research     Open Access   (Followers: 14)
Advances in Operator Theory     Hybrid Journal   (Followers: 4)
Advances in Porous Media     Full-text available via subscription   (Followers: 6)
Advances in Pure Mathematics     Open Access   (Followers: 11)
Advances in Science and Research (ASR)     Open Access   (Followers: 8)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 12)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 7)
Afrika Matematika     Hybrid Journal   (Followers: 3)
Air, Soil & Water Research     Open Access   (Followers: 13)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 4)
AKSIOMATIK : Jurnal Penelitian Pendidikan dan Pembelajaran Matematika     Open Access   (Followers: 1)
Al-Jabar : Jurnal Pendidikan Matematika     Open Access   (Followers: 1)
Al-Qadisiyah Journal for Computer Science and Mathematics     Open Access   (Followers: 1)
AL-Rafidain Journal of Computer Sciences and Mathematics     Open Access   (Followers: 6)
Algebra and Logic     Hybrid Journal   (Followers: 8)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Open Access   (Followers: 5)
Algorithms     Open Access   (Followers: 14)
Algorithms Research     Open Access   (Followers: 2)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 10)
American Journal of Mathematical Analysis     Open Access   (Followers: 2)
American Journal of Mathematical and Management Sciences     Hybrid Journal   (Followers: 1)
American Journal of Mathematics     Full-text available via subscription   (Followers: 9)
American Journal of Operations Research     Open Access   (Followers: 8)
American Mathematical Monthly     Full-text available via subscription   (Followers: 7)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 13)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access  
Analysis and Applications     Hybrid Journal   (Followers: 2)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 10)
Analysis Mathematica     Full-text available via subscription  
Anargya : Jurnal Ilmiah Pendidikan Matematika     Open Access   (Followers: 8)
Annales Mathematicae Silesianae     Open Access   (Followers: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annales Universitatis Mariae Curie-Sklodowska, sectio A – Mathematica     Open Access   (Followers: 1)
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica     Open Access  
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 17)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 8)
Annals of Functional Analysis     Hybrid Journal   (Followers: 4)
Annals of Mathematics     Full-text available via subscription   (Followers: 4)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 16)
Annals of PDE     Hybrid Journal  
Annals of Pure and Applied Logic     Open Access   (Followers: 6)
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   (Followers: 1)
Annals of West University of Timisoara - Mathematics and Computer Science     Open Access   (Followers: 2)
Annuaire du Collège de France     Open Access   (Followers: 6)
ANZIAM Journal     Open Access   (Followers: 2)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applications of Mathematics     Hybrid Journal   (Followers: 3)
Applied Categorical Structures     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Mathematics     Open Access   (Followers: 10)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 13)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal   (Followers: 2)
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 1)
Applied Mathematics Letters     Full-text available via subscription   (Followers: 3)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 2)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 6)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 4)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 4)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Armenian Journal of Mathematics     Open Access   (Followers: 1)
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites     Open Access   (Followers: 24)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
Asian Research Journal of Mathematics     Open Access  
Asian-European Journal of Mathematics     Hybrid Journal   (Followers: 4)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 7)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 2)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Axioms     Open Access   (Followers: 1)
Baltic International Yearbook of Cognition, Logic and Communication     Open Access   (Followers: 2)
Banach Journal of Mathematical Analysis     Hybrid Journal   (Followers: 1)
Basin Research     Hybrid Journal   (Followers: 6)
BIBECHANA     Open Access   (Followers: 2)
Biomath     Open Access  
BIT Numerical Mathematics     Hybrid Journal   (Followers: 1)
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: 3)
British Journal for the History of Mathematics     Hybrid Journal  
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: 15)
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: 3)
Bulletin of Mathematical Sciences     Open Access   (Followers: 1)
Bulletin of Symbolic Logic     Full-text available via subscription   (Followers: 3)
Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics     Open Access  
Bulletin of the Australian Mathematical Society     Full-text available via subscription   (Followers: 2)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the Iranian Mathematical Society     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 3)
Bulletin of the Malaysian Mathematical Sciences Society     Hybrid Journal  
Cadernos do IME : Série Matemática     Open Access   (Followers: 2)
Calculus of Variations and Partial Differential Equations     Hybrid Journal  
Canadian Journal of Mathematics / Journal canadien de mathématiques     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 23)
Canadian Mathematical Bulletin     Hybrid Journal  
Carpathian Mathematical Publications     Open Access   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 6)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals : X     Open Access   (Followers: 1)
ChemSusChem     Hybrid Journal   (Followers: 8)
Chinese Annals of Mathematics, Series B     Hybrid Journal  
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 3)
Chinese Journal of Mathematics     Open Access  
Ciencia     Open Access   (Followers: 1)
CODEE Journal     Open Access   (Followers: 2)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 18)
Commentarii Mathematici Helvetici     Hybrid Journal  
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: 4)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 5)
Complex Analysis and its Synergies     Open Access   (Followers: 3)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Composite Materials Series     Full-text available via subscription   (Followers: 11)
Compositio Mathematica     Full-text available via subscription  
Comptes Rendus : Mathematique     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 4)
Computational and Mathematical Methods     Hybrid Journal  
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 3)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 1)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 9)
Computational Mechanics     Hybrid Journal   (Followers: 10)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 11)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 11)
Confluentes Mathematici     Hybrid Journal  
Constructive Mathematical Analysis     Open Access   (Followers: 1)
Contributions to Discrete Mathematics     Open Access   (Followers: 1)
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal   (Followers: 1)
Cryptography and Communications     Hybrid Journal   (Followers: 14)
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)
Daya Matematis : Jurnal Inovasi Pendidikan Matematika     Open Access   (Followers: 1)
Demographic Research     Open Access   (Followers: 16)
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 35)
Desimal : Jurnal Matematika     Open Access   (Followers: 3)
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)

        1 2 3 4 5 | Last

Similar Journals
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Bulletin of the Iranian Mathematical Society
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1017-060X - ISSN (Online) 1735-8515
Published by Springer-Verlag Homepage  [2658 journals]
  • Dimensional Splitting Well-Balanced Schemes on Cartesian Mesh for 2D
           Shallow Water Equations with Variable Topography

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      Abstract: We present two types of simple algorithms for numerical approximations of the two-dimensional shallow water equations with variable topography by a dimensional splitting approach. The scheme of the first type has two steps and the the one of the second type has three steps of splitting dimensions in each iteration. In each step, the component computation incorporates a well-balanced method on Cartesian mesh in one-dimensional space. Tests show that these schemes provide us with a reasonable accuracy. Furthermore, we also establish the well-balanced property for both types of schemes.
      PubDate: 2021-10-15
       
  • Inertial Subgradient Projection Algorithms Extended to Equilibrium
           Problems

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      Abstract: In this paper, we introduce a new inertial subgradient projection algorithm for finding a solution of an equilibrium problem in a real Hilbert space. The algorithm combines subgradient projection methods with the self-adaptive and inertial techniques to generate an iteration sequence converging weakly to a solution of the equilibrium problem. Based on the proposed algorithm, we develop a modified algorithm for finding a common solution of the equilibrium problem and fixed point problems. Several of fundamental experiments are showed to illustrate our algorithms and compare with some others.
      PubDate: 2021-10-15
       
  • On the Conformally Balanced Condition on Kähler-Like Almost Hermitian
           Manifolds and the Semi-Kählerity

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      Abstract: We introduce the conformally balanced condition on almost Hermitian manifolds. We show that a compact Kähler-like and G-Kähler-like almost Hermitian manifold with the conformally balanced condition becomes Kähler.
      PubDate: 2021-10-15
       
  • Two Improved Nonlinear Conjugate Gradient Methods with the Strong Wolfe
           Line Search

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      Abstract: Two improved nonlinear conjugate gradient methods are proposed by using the second inequality of the strong Wolfe line search. Under usual assumptions, we proved that the improved methods possess the sufficient descent property and global convergence. By testing the unconstrained optimization problems which taken from the CUTE library and other usual test collections, some large-scale numerical experiments for the presented methods and their comparisons are executed. The detailed results are listed in tables and their corresponding performance profiles are reported in figures, which show that our improved methods are superior to their comparisons.
      PubDate: 2021-10-15
       
  • On the Frames of Translates on Locally Compact Abelian Groups

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      Abstract: For a second countable locally compact abelian group G, we study a system of translates generated by \(f \in L^2 (G)\) . We find some equivalent conditions of this family to have some fundamental frame properties. More precisely, let \(\Gamma \) be a uniform lattice in G (a closed subgroup which is cocompact and discrete) and \(\Gamma ^*\) be the annihilator of \(\Gamma \) in \({\widehat{G}}\) . For \(f \in L^2(G)\) , the \(\Gamma ^*\) -periodic function \(\Phi _f\) is defined as \(\Phi _f (\xi ) = \sum _{\gamma \in {\Gamma } ^*} {\widehat{f}} (\xi + \gamma ) ^2\) on \({\widehat{\Gamma }}\) (the dual group of \(\Gamma \) ) and some of its properties are investigated. In particular, it is shown that if \(\Phi _f\) is continuous, then the family \(\lbrace f(.+ \gamma ) \rbrace _{\gamma \in \Gamma }\) cannot be a redundant frame. Among other things, it is shown that there is an isometry from \(L^2(G)\) into \(L^2({\widehat{\Gamma }})\) in such a way that the system of translates in \(L^2({\widehat{\Gamma }})\) is transferred to a nice Fourier-like system in \(L^2({\widehat{\Gamma }})\) . Also, the canonical and oblique duals of the frames of translates are investigated.
      PubDate: 2021-10-13
       
  • Weighted Ergodic Components in $${{\mathbb {R}}}^{n}$$ R n

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      Abstract: In this paper, we analyze various classes of weighted Stepanov ergodic spaces, weighted Weyl ergodic spaces and weighted pseudo-ergodic spaces in \({{\mathbb {R}}}^{n}\) with the help of results from the theory of Lebesgue spaces with variable exponents \(L^{p(x)}\) . Several structural results of ours seem to be new even in the case of consideration of the constant exponents \(p(x)\equiv p\in [1,\infty ).\) We especially examine the Stepanov asymptotical almost periodicity at minus infinity and the Weyl asymptotical almost periodicity at minus infinity, providing also some interesting applications to the abstract Volterra integro-differential equations in Banach spaces.
      PubDate: 2021-10-11
       
  • A Tighter C-Eigenvalue Interval for Piezoelectric-Type Tensors

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      Abstract: To locate all C-eigenvalues of a piezoelectric-type tensor, a new C-eigenvalue inclusion interval is constructed. It is proved that the new interval is tighter than that proposed by Wang et al. (Appl Math Lett 100:106035, 2020). Numerical examples show the effectiveness of the new result.
      PubDate: 2021-10-11
       
  • $$N_{\psi }$$ N ψ -Type Quotient Modules in $$H^{2}({\mathbb
           {D}}^{n})$$ H 2 ( D n )

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      Abstract: In this paper, \(N_{\psi }\) -type quotient modules \(H^{2}({\mathbb {T}}^{n})/{\mathcal {K}}\) of the Hardy module on polydisc are defined, where \({\mathcal {K}}\) is the submodule generated by \(\{z_{1}-\psi (z_{k}),2\le k\le n\}\) for a finite Blaschke product. Alternative characterizations are given and an orthonormal basis is constructed. Then we show that the self-commutators and cross-commutators are in trace class, self-commutators are Hilbert–Schmidt. Moreover, the traces and the Hilbert–Schmidt norms are given, respectively.
      PubDate: 2021-10-07
       
  • Optimality Conditions and Duality for Multiobjective Semi-infinite
           Programming on Hadamard Manifolds

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      Abstract: This article is devoted to studying the problem of multiobjective semi-infinite programming on Hadamard manifolds. We first establish both Karush–Kuhn–Tucker necessary and sufficient optimality conditions for some type of efficient solutions. Then, we propose Wolfe and Mond–Weir-type dual problems and examine duality relations under geodesic convexity assumptions.
      PubDate: 2021-10-07
       
  • Nonlinear Maps Preserving Mixed Product on Factors

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      Abstract: Let \({\mathcal {A}}\) and \({\mathcal {B}}\) be two factors with dim \({\mathcal {A}}>4\) . In this article, it is proved that a bijective map \(\Phi : {\mathcal {A}}\rightarrow {\mathcal {B}}\) satisfies \(\Phi ([A\bullet B, C])=[\Phi (A)\bullet \Phi (B), \Phi (C)]\) for all \(A, B, C\in {\mathcal {A}}\) if and only if \(\Phi \) is a linear \(*\) -isomorphism, or a conjugate linear \(*\) -isomorphism, or the negative of a linear \(*\) -isomorphism, or the negative of a conjugate linear \(*\) -isomorphism.
      PubDate: 2021-10-01
       
  • Extended Irreducible Nekrasov Matrices as Subclasses of Irreducible
           H-Matrices

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      Abstract: In this paper, we introduce the irreducible \(\alpha \) -Nekrasov matrices and irreducible \(\alpha \) -S-Nekrasov matrices as the extended irreducible Nekrasov matrices and we analyze the relationships among the involved matrices and irreducible H-matrices.
      PubDate: 2021-10-01
       
  • $$\sigma $$ σ -Commuting and $$\sigma $$ σ -Centralizing
           Anti-homomorphisms

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      Abstract: Let \({\mathcal {R}}\) be a semiprime ring with center \(Z({\mathcal {R}})\) and with extended centroid C and let \(\sigma : {\mathcal {R}} \rightarrow {\mathcal {R}}\) be an automorphism. Assume that \(\tau : {\mathcal {R}} \rightarrow {\mathcal {R}} \) is an anti-homomorphism, such that the image of \(\tau \) has small centralizer. It is proved that the following are equivalent: (1) \(x^{\sigma }x^{\tau } = x^{\tau }x^{\sigma }\) for all \(x\in {\mathcal {R}};\) (2) \(x^{\sigma } + x^{\tau }\in Z({\mathcal {R}})\) for all \(x\in {\mathcal {R}};\) (3) \(x^{\sigma }x^{\tau }\in Z({\mathcal {R}})\) for all \(x\in {\mathcal {R}}.\) In this case, there exists an idempotent \(e \in C\) , such that \((1-e){\mathcal {R}}\) is a commutative ring and the semiprime ring \(e{\mathcal {R}}\) is equipped with an involution \(\widetilde{\tau }\) , which is induced canonically by \(\tau \) . Note that one can easily obtained the main result in Lee (Commun Algebra 46(3):1060–1065, 2018) when \(\sigma =id_{{\mathcal {R}}}.\)
      PubDate: 2021-10-01
       
  • An Upper Bound on the Double Roman Domination Number

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      Abstract: Let \(G=(V,E)\) be a simple graph. A set \(M\subseteq E\) is a matching if no two edges in M have a common vertex. The matching number, denoted \(\beta (G)\) (or \(\beta \) ), is the maximum size of a matching in G. A double Roman dominating function (DRDF) on a graph G is a function f: \(V\longrightarrow \{0,1,2,3\}\) satisfying the conditions that for every vertex u of weight \(f(u)\in \left\{ 0,1\right\} \) : \(\left( i\right) \) if \(f(u)=0\) , then u is adjacent to either at least one vertex v with \(f(v)=3\) or two vertices \(v_{1}\) , \(v_{2}\) with \(f(v_{1})=f(v_{2})=2\) . \(\left( ii\right) \) if \(f(u)=1\) , then u is adjacent to at least one vertex v with \(f(v)\in \left\{ 2,3\right\} \) . The weight of a double Roman dominating function f is the value \(f(V)=\sum _{u\in V}f(u)\) . The minimum weight of a double Roman dominating function on a graph G is called the double Roman domination number of G, denoted by \(\gamma _{dR}\left( G\right) \) . In this paper, first, we note that \(\gamma _{dR}(G)\le 3\beta (G)\) , where G is a graph without isolated vertices. Moreover, we give a descriptive characterization of block graphs G satisfying \(\gamma _{dR}(G)=3\beta (G)\) . Finally, we show that the decision problem associated with \(\gamma _{dR}(G)=3\beta (G)\) is \(CO-\mathcal {NP}\) -complete for bipartite graphs.
      PubDate: 2021-10-01
       
  • Starlike Functions Associated with Cosine Functions

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      Abstract: Let \(S_{\cos }^{*}\) denote the class of normalized analytic functions f such that \(\frac{zf^{\prime }(z)}{f(z)}\prec \cos (z)\) . For this class, we obtain structural formula, inclusion results, differential subordinations and some radii problems such as radius of convexity, radius for the class of Janowski starlike functions and radius for some other subclasses of starlike functions.
      PubDate: 2021-10-01
       
  • Schur Complement-Based Infinity Norm Bounds for the Inverse of DSDD
           Matrices

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      Abstract: Based on the Schur complements, two upper bounds for the infinity norm of the inverse of doubly strictly diagonally dominant (DSDD) matrices are presented. As applications, an error bound for linear complementarity problems of DB-matrices and a lower bound for the smallest singular value of matrices are given.
      PubDate: 2021-10-01
       
  • Uniqueness of Meromorphic Functions with Their nth Order Differences

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      Abstract: Let f be a transcendental meromorphic function of hyper-order strictly less than 1. In this paper, we deal with the uniqueness problem on f sharing two values with its nth order differences \(\Delta ^n f \) . And this research extends earlier results by Chen and Yi (Result Math 63:557–565, 2013), Gao et al. (Anal Math 45:321–334, 2019) and Lü and Lü (Comput Methods Funct Theory 17:395–403, 2017).
      PubDate: 2021-10-01
       
  • Rings Characterized via Some Classes of Almost-Injective Modules

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      Abstract: In this paper, we study rings with the property that every cyclic module is almost-injective (CAI). It is shown that R is an Artinian serial ring with \(J(R)^2=0\) if and only if R is a right CAI-ring with the finitely generated right socle (or I-finite) if and only if every semisimple right R-module is almost injective, \(R_R\) is almost injective and has finitely generated right socle. Especially, R is a two-sided CAI-ring if and only if every (right and left) R-module is almost injective. From this, we have the decomposition of a CAI-ring via an SV-ring for which Loewy (R) \(\le \) 2 and an Artinian serial ring whose squared Jacobson radical vanishes. We also characterize a Noetherian right almost V-ring via the ring for which every semisimple right R-module is almost injective.
      PubDate: 2021-10-01
       
  • Amalgamated Algebras Issued from $$\phi $$ ϕ -Chained Rings and $$\phi $$
           ϕ -Pseudo-Valuation Rings

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      Abstract: Let \(f : A \longrightarrow B\) be a ring homomorphism and let J be an ideal of B. In this article, we study the possible transfer of the properties of being a \(\phi \) -ring, a \(\phi \) -chained ring, and a \(\phi \) -pseudo-valuation ring to the amalgamated algebra \(A\bowtie ^{f}J\) . Our aim is to provide examples of new classes of commutative rings satisfying the aforementioned properties.
      PubDate: 2021-10-01
       
  • Second-Order Necessary and Sufficient Optimality Conditions for
           Constrained Vector Equilibrium Problem with Applications

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      Abstract: In this paper, we study a generalized convex vector equilibrium problem with cone and set constraints in real Banach spaces. We provide some basic characterizations on generalized convexity for the first- and second-order directional derivatives. We obtain Kuhn–Tucker second-order necessary and sufficient optimality conditions for efficiency to such problem under suitable assumptions on the generalized convexity of objective and constraint functions. As an application, we present Kuhn–Tucker second-order necessary and sufficient optimality conditions to a generalized convex vector variational inequality problem and a generalized convex vector optimization problem with constraints. Some examples are also given to demonstrate the main results of the paper.
      PubDate: 2021-10-01
       
  • Sufficient Conditions for Strong Starlikeness

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      Abstract: Let p be an analytic function defined on the open unit disc \(\mathbb {D}\) with \(p(0)=1\) and \(0< \alpha \le 1\) . The conditions on complex valued functions C, D, and E are obtained for p to be subordinate to \(((1+z)/(1-z))^{\alpha }\) when \(C(z) z^{2}p''(z)+D(z)zp'(z) + E(z)p(z)=0\) . Sufficient conditions for confluent (Kummer) hypergeometric function and generalized and normalized Bessel function of the first kind of complex order to be subordinate to \(((1+z)/(1-z))^{\alpha }\) are obtained as applications. The conditions on \(\alpha \) and \(\beta \) are derived for p to be subordinate to \(((1+z)/(1-z))^{\alpha }\) when \(1+\beta zp'(z)/p^{n}(z)\) with \(n=1,2\) is subordinate to \(1+4z/3+2z^{2}/3=:\varphi _{CAR}(z)\) . Similar problems were investigated for \({{\,\mathrm{Re}\,}}p(z)>0\) when the function \(p(z)+\beta zp'(z)/p^{n}(z)\) with \(n=0,2\) is subordinate to \(\varphi _{CAR}(z)\) . The condition on \(\beta \) is determined for p to be subordinate to \(((1+z)/(1-z))^{\alpha }\) when \(p(z)+\beta zp'(z)/p^{n}(z)\) with \(n=0,1,2\) is subordinate to \(((1+z)/(1-z))^{\alpha }\) .
      PubDate: 2021-10-01
       
 
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