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  Subjects -> MATHEMATICS (Total: 955 journals)
    - APPLIED MATHEMATICS (82 journals)
    - GEOMETRY AND TOPOLOGY (20 journals)
    - MATHEMATICS (706 journals)
    - MATHEMATICS (GENERAL) (43 journals)
    - NUMERICAL ANALYSIS (22 journals)
    - PROBABILITIES AND MATH STATISTICS (82 journals)

MATHEMATICS (706 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: 3)
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     Full-text available via subscription   (Followers: 27)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1)
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: 9)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 6)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 18)
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: 2)
Advances in Materials Sciences     Open Access   (Followers: 14)
Advances in Mathematical Physics     Open Access   (Followers: 3)
Advances in Mathematics     Full-text available via subscription   (Followers: 10)
Advances in Numerical Analysis     Open Access   (Followers: 4)
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: 5)
Advances in Science and Research (ASR)     Open Access   (Followers: 4)
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  
Algebra and Logic     Hybrid Journal   (Followers: 5)
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)
American Mathematical Monthly     Full-text available via subscription   (Followers: 6)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 8)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access   (Followers: 1)
Analysis     Hybrid Journal   (Followers: 2)
Analysis and Applications     Hybrid Journal   (Followers: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 4)
Analysis Mathematica     Full-text available via subscription  
Annales Mathematicae Silesianae     Open Access  
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annales UMCS, Mathematica     Open Access   (Followers: 1)
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica     Open Access  
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 11)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 6)
Annals of Mathematics     Full-text available via subscription  
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of the Alexandru Ioan Cuza University - Mathematics     Open Access  
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1)
Annals of West University of Timisoara - Mathematics     Open Access  
Annuaire du Collège de France     Open Access   (Followers: 5)
ANZIAM Journal     Open Access   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applications of Mathematics     Hybrid Journal   (Followers: 1)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Mathematics     Open Access   (Followers: 3)
Applied Mathematics     Open Access   (Followers: 6)
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: 1)
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: 4)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 3)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 2)
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 : The Journal of Space Research Centre of Polish Academy of Sciences     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: 21)
Bruno Pini Mathematical Analysis Seminar     Open Access  
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 11)
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: 18)
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  
College Mathematics Journal     Full-text available via subscription   (Followers: 4)
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: 12)
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: 10)
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 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)

        1 2 3 4 | Last

Journal Cover Czechoslovak Mathematical Journal
  [SJR: 0.364]   [H-I: 21]   [1 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1572-9141 - ISSN (Online) 0011-4642
   Published by Springer-Verlag Homepage  [2352 journals]
  • Harmonic Metrics on Four Dimensional Non-Reductive Homogeneous Manifolds
    • Authors: Amirhesam Zaeim; Parvane Atashpeykar
      Pages: 1 - 16
      Abstract: We study harmonic metrics with respect to the class of invariant metrics on non-reductive homogeneous four dimensional manifolds. In particular, we consider harmonic lifted metrics with respect to the Sasaki lifts, horizontal lifts and complete lifts of the metrics under study.
      PubDate: 2018-02-14
      DOI: 10.21136/cmj.2018.0502-16
       
  • The Discrete Logarithm Problem Over Prime Fields: The Safe Prime Case. The
           Smart Attack, Non-Canonical Lifts and Logarithmic Derivatives
    • Authors: Hejmadi Gopalakrishna Gadiyar; Ramanathan Padma
      Pages: 1 - 10
      Abstract: We connect the discrete logarithm problem over prime fields in the safe prime case to the logarithmic derivative.
      PubDate: 2018-02-14
      DOI: 10.21136/cmj.2018.0128-17
       
  • Every 2-Group with All Subgroups Normal-By-Finite is Locally Finite
    • Authors: Enrico Jabara
      Pages: 1 - 6
      Abstract: A group G has all of its subgroups normal-by-finite if H/HG is finite for all subgroups H of G. The Tarski-groups provide examples of p-groups (p a “large” prime) of nonlocally finite groups in which every subgroup is normal-by-finite. The aim of this paper is to prove that a 2-group with every subgroup normal-by-finite is locally finite. We also prove that if H/HG⩽ 2 for every subgroup H of G, then G contains an Abelian subgroup of index at most 8.
      PubDate: 2018-02-14
      DOI: 10.21136/cmj.2018.0504-16
       
  • Coherence Relative to a Weak Torsion Class
    • Authors: Zhanmin Zhu
      Pages: 1 - 20
      Abstract: Let R be a ring. A subclass T of left R-modules is called a weak torsion class if it is closed under homomorphic images and extensions. Let T be a weak torsion class of left R-modules and n a positive integer. Then a left R-module M is called T-finitely generated if there exists a finitely generated submodule N such that M/N ∈ T; a left R-module A is called (T, n)-presented if there exists an exact sequence of left R-modules $$0 \to K_{n - 1} \to F_{n - 1} \to \ldots \to F_1 \to F_0 \to M \to 0$$ such that F0,..., Fn-1 are finitely generated free and Kn-1 is T-finitely generated; a left R-module M is called (T, n)-injective, if Ext R n (A,M) = 0 for each (T, n+1)-presented left R-module A; a right R-module M is called (T, n)-flat, if Tor n R (M,A) = 0 for each (T, n+1)-presented left R-module A. A ring R is called (T, n)-coherent, if every (T, n+1)-presented module is (n + 1)-presented. Some characterizations and properties of these modules and rings are given.
      PubDate: 2018-02-10
      DOI: 10.21136/cmj.2018.0494-16
       
  • Proper Connection Number of Bipartite Graphs
    • Authors: Jun Yue; Meiqin Wei; Yan Zhao
      Pages: 1 - 16
      Abstract: An edge-colored graph G is proper connected if every pair of vertices is connected by a proper path. The proper connection number of a connected graph G, denoted by pc(G), is the smallest number of colors that are needed to color the edges of G in order to make it proper connected. In this paper, we obtain the sharp upper bound for pc(G) of a general bipartite graph G and a series of extremal graphs. Additionally, we give a proper 2-coloring for a connected bipartite graph G having δ(G) ⩾ 2 and a dominating cycle or a dominating complete bipartite subgraph, which implies pc(G) = 2. Furthermore, we get that the proper connection number of connected bipartite graphs with δ ⩾ 2 and diam(G) ⩽ 4 is two.
      PubDate: 2018-02-08
      DOI: 10.21136/cmj.2018.0122-16
       
  • On the Weighted Estimate of the Bergman Projection
    • Authors: Benoit Florent Sehba
      Pages: 1 - 15
      Abstract: We present a proof of the weighted estimate of the Bergman projection that does not use extrapolation results. This estimate is extended to product domains using an adapted definition of Békollé-Bonami weights in this setting. An application to bounded Toeplitz products is also given.
      PubDate: 2018-02-08
      DOI: 10.21136/cmj.2018.0531-16
       
  • On g c -Colorings of Nearly Bipartite Graphs
    • Authors: Yuzhuo Zhang; Xia Zhang
      Pages: 1 - 12
      Abstract: Let G be a simple graph, let d(v) denote the degree of a vertex v and let g be a nonnegative integer function on V(G) with 0 ⩽ g(v) ⩽ d(v) for each vertex v ∈ V(G). A gc-coloring of G is an edge coloring such that for each vertex v ∈ V(G) and each color c, there are at least g(v) edges colored c incident with v. The gc-chromatic index of G, denoted by \(\chi '_{g_c } (G)\) , is the maximum number of colors such that a gc-coloring of G exists. Any simple graph G has the gc-chromatic index equal to δg(G) or δg(G)–1, where \(\delta _g (G) = \mathop {\min }\limits_{v \in V(G)} \left\lfloor {d(v)/g(v)} \right\rfloor\) . A graph G is nearly bipartite, if G is not bipartite, but there is a vertex u ∈ V(G) such that G–u is a bipartite graph. We give some new sufficient conditions for a nearly bipartite graph G to have \(\chi '_{g_c } (G) = g(G)\) . Our results generalize some previous results due to Wang et al. in 2006 and Li and Liu in 2011.
      PubDate: 2018-02-08
      DOI: 10.21136/cmj.2018.0477-16
       
  • On Weak Supercyclicity II
    • Authors: Carlos S. Kubrusly; Bhagwati P. Duggal
      Pages: 1 - 16
      Abstract: This paper considers weak supercyclicity for bounded linear operators on a normed space. On the one hand, weak supercyclicity is investigated for classes of Hilbertspace operators: (i) self-adjoint operators are not weakly supercyclic, (ii) diagonalizable operators are not weakly l-sequentially supercyclic, and (iii) weak l-sequential supercyclicity is preserved between a unitary operator and its adjoint. On the other hand, weak supercyclicity is investigated for classes of normed-space operators: (iv) the point spectrum of the normed-space adjoint of a power bounded supercyclic operator is either empty or is a singleton in the open unit disk, (v) weak l-sequential supercyclicity coincides with supercyclicity for compact operators, and (vi) every compact weakly l-sequentially supercyclic operator is quasinilpotent.
      PubDate: 2018-02-08
      DOI: 10.21136/cmj.2018.0457-16
       
  • The Weighted Hardy Spaces Associated to Self-Adjoint Operators and Their
           Duality on Product Spaces
    • Authors: Suying Liu; Minghua Yang
      Pages: 1 - 17
      Abstract: Let L be a non-negative self-adjoint operator acting on L2(ℝn) satisfying a pointwise Gaussian estimate for its heat kernel. Let w be an Ar weight on ℝn × ℝn, 1 < r < 1. In this article we obtain a weighted atomic decomposition for the weighted Hardy space H L,w p (ℝn×ℝn), 0 < p ⩽ 1 associated to L. Based on the atomic decomposition, we show the dual relationship between H L,w 1 (ℝn × ℝn) and BMOL,w(ℝn × ℝn).
      PubDate: 2018-02-07
      DOI: 10.21136/cmj.2018.0469-16
       
  • Order of the Smallest Counterexample to Gallai’s Conjecture
    • Authors: Fuyuan Chen
      Pages: 1 - 29
      Abstract: In 1966, Gallai conjectured that all the longest paths of a connected graph have a common vertex. Zamfirescu conjectured that the smallest counterexample to Gallai’s conjecture is a graph on 12 vertices. We prove that Gallai’s conjecture is true for every connected graph G with α’(G) ⩽ 5, which implies that Zamfirescu’s conjecture is true.
      PubDate: 2018-02-07
      DOI: 10.21136/cmj.2018.0422-16
       
  • The Method of Lines for Hyperbolic Stochastic Functional Partial
           Differential Equations
    • Authors: Monika Wrzosek; Maria Ziemlańska
      Pages: 1 - 17
      Abstract: We apply an approximation by means of the method of lines for hyperbolic stochastic functional partial differential equations driven by one-dimensional Brownian motion. We study the stability with respect to small L2-perturbations.
      PubDate: 2018-02-05
      DOI: 10.21136/cmj.2018.0155-16
       
  • Zeros of a Certain Class of Gauss Hypergeometric Polynomials
    • Authors: Addisalem Abathun; Rikard Bøgvad
      Pages: 1 - 11
      Abstract: We prove that as n → ∞, the zeros of the polynomial $$_2 F_1 \left[ {\begin{array}{*{20}c} { - n,\alpha n + 1} \\ {\alpha n + 2} \\ \end{array} ;z} \right]$$ cluster on (a part of) a level curve of an explicit harmonic function. This generalizes previous results of Boggs, Driver, Duren et al. (1999–2001) to the case of a complex parameter α and partially proves a conjecture made by the authors in an earlier work.
      PubDate: 2018-02-02
      DOI: 10.21136/cmj.2018.0055-17
       
  • Some Berezin Number Inequalities for Operator Matrices
    • Authors: Mojtaba Bakherad
      Pages: 1 - 13
      Abstract: The Berezin symbol à of an operator A acting on the reproducing kernel Hilbert space H = H(Ω) over some (nonempty) set is defined by \(\tilde A(\lambda ) = \left\langle {A\hat k_\lambda ,\hat k_\lambda } \right\rangle \) , λ ∈ Ω, where \(\hat k_\lambda = k_\lambda /\left\ {k_\lambda } \right\ \) is the normalized reproducing kernel of H. The Berezin number of the operator A is defined by \(ber(A) = \mathop {\sup }\limits_{\lambda \in \Omega } \left {\tilde A(\lambda )} \right = \mathop {\sup }\limits_{\lambda \in \Omega } \left {\left\langle {A\hat k_\lambda ,\hat k_\lambda } \right\rangle } \right \) . Moreover, ber(A) ⩽ w(A) (numerical radius). We present some Berezin number inequalities. Among other inequalities, it is shown that if \(T = \left[ {\begin{array}{*{20}c} A & B \\ C & D \\ \end{array} } \right] \in \mathbb{B}(\mathcal{H}(\Omega _1 ) \oplus \mathcal{H}(\Omega _2 ))\) , then $$ber(T) \leqslant \frac{1} {2}(ber(A) + ber(D)) + \frac{1} {2}\sqrt {(ber(A) - ber(D))^2 + \left( {\left\ B \right\ + \left\ C \right\ } \right)^2 } .$$
      PubDate: 2018-02-01
      DOI: 10.21136/cmj.2018.0048-17
       
  • The Construction of 3-Lie 2-Algebras
    • Authors: Chunyue Wang; Qingcheng Zhang
      Pages: 1 - 11
      Abstract: We construct a 3-Lie 2-algebra from a 3-Leibniz algebra and a Rota-Baxter 3-Lie algebra. Moreover, we give some examples of 3-Leibniz algebras.
      PubDate: 2018-02-01
      DOI: 10.21136/cmj.2018.0627-16
       
  • Generalized outerplanar index of a graph
    • Authors: Zahra Barati
      Pages: 1 - 9
      Abstract: We define the generalized outerplanar index of a graph and give a full characterization of graphs with respect to this index.
      PubDate: 2018-01-26
      DOI: 10.21136/cmj.2018.0365-16
       
  • Non-Wieferich primes in number fields and abc -conjecture
    • Authors: Srinivas Kotyada; Subramani Muthukrishnan
      Pages: 1 - 9
      Abstract: Let K/Q be an algebraic number field of class number one and let O K be its ring of integers. We show that there are infinitely many non-Wieferich primes with respect to certain units in OK under the assumption of the abc-conjecture for number fields.
      PubDate: 2018-01-26
      DOI: 10.21136/cmj.2018.0485-16
       
  • Recognition of some families of finite simple groups by order and set of
           orders of vanishing elements
    • Authors: Maryam Khatami; Azam Babai
      Pages: 1 - 10
      Abstract: Let G be a finite group. An element g ∈ G is called a vanishing element if there exists an irreducible complex character χ of G such that χ(g)= 0. Denote by Vo(G) the set of orders of vanishing elements of G. Ghasemabadi, Iranmanesh, Mavadatpour (2015), in their paper presented the following conjecture: Let G be a finite group and M a finite nonabelian simple group such that Vo(G) = Vo(M) and G = M . Then G ≌ M. We answer in affirmative this conjecture for M = Sz(q), where q = 22n+1 and either q − 1, \(q - \sqrt {2q} + 1\) or q + \(\sqrt {2q} + 1\) is a prime number, and M = F4(q), where q = 2 n and either q4 + 1 or q4 − q2 + 1 is a prime number.
      PubDate: 2018-01-26
      DOI: 10.21136/cmj.2018.0355-16
       
  • When a line graph associated to annihilating-ideal graph of a lattice is
           planar or projective
    • Authors: Atossa Parsapour; Khadijeh Ahmad Javaheri
      Pages: 1 - 16
      Abstract: Let (L,∧, ∨) be a finite lattice with a least element 0. AG(L) is an annihilating-ideal graph of L in which the vertex set is the set of all nontrivial ideals of L, and two distinct vertices I and J are adjacent if and only if I ∧ J = 0. We completely characterize all finite lattices L whose line graph associated to an annihilating-ideal graph, denoted by L(AG(L)), is a planar or projective graph.
      PubDate: 2018-01-26
      DOI: 10.21136/cmj.2018.0635-15
       
  • Group algebras whose groups of normalized units have exponent 4
    • Authors: Victor Bovdi; Mohammed Salim
      Pages: 1 - 8
      Abstract: We give a full description of locally finite 2-groups G such that the normalized group of units of the group algebra FG over a field F of characteristic 2 has exponent 4.
      PubDate: 2018-01-26
      DOI: 10.21136/cmj.2018.0386-16
       
  • Graphs with small diameter determined by their D -spectra
    • Authors: Ruifang Liu; Jie Xue
      Pages: 1 - 18
      Abstract: Let G be a connected graph with vertex set V(G) = {v1, v2,..., v n }. The distance matrix D(G) = (d ij )n×n is the matrix indexed by the vertices of G, where d ij denotes the distance between the vertices v i and v j . Suppose that λ1(D) ≥ λ2(D) ≥... ≥ λ n (D) are the distance spectrum of G. The graph G is said to be determined by its D-spectrum if with respect to the distance matrix D(G), any graph having the same spectrum as G is isomorphic to G. We give the distance characteristic polynomial of some graphs with small diameter, and also prove that these graphs are determined by their D-spectra.
      PubDate: 2018-01-26
      DOI: 10.21136/cmj.2018.0505-15
       
 
 
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