Subjects -> MATHEMATICS (Total: 1100 journals)
    - APPLIED MATHEMATICS (88 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (812 journals)
    - MATHEMATICS (GENERAL) (43 journals)
    - NUMERICAL ANALYSIS (24 journals)

MATHEMATICS (812 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: 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: 16)
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: 39)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1)
Acta Mathematica     Hybrid Journal   (Followers: 13)
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: 12)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 10)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 23)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 3)
Advances in Fixed Point Theory     Open Access   (Followers: 8)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 19)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 11)
Advances in Materials Science     Open Access   (Followers: 19)
Advances in Mathematical Physics     Open Access   (Followers: 8)
Advances in Mathematics     Full-text available via subscription   (Followers: 17)
Advances in Nonlinear Analysis     Open Access   (Followers: 1)
Advances in Numerical Analysis     Open Access   (Followers: 9)
Advances in Operations Research     Open Access   (Followers: 13)
Advances in Operator Theory     Hybrid Journal   (Followers: 4)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Pure and Applied Mathematics     Hybrid Journal   (Followers: 10)
Advances in Pure Mathematics     Open Access   (Followers: 11)
Advances in Science and Research (ASR)     Open Access   (Followers: 9)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 9)
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: 3)
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: 7)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Open Access   (Followers: 5)
Algorithms     Open Access   (Followers: 12)
Algorithms Research     Open Access   (Followers: 1)
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: 7)
American Journal of Operations Research     Open Access   (Followers: 8)
American Mathematical Monthly     Full-text available via subscription   (Followers: 6)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 11)
Anadol University Journal of Science and Technology B : Theoritical Sciences     Open Access  
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access  
Analysis and Applications     Hybrid Journal   (Followers: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 6)
Analysis Mathematica     Full-text available via subscription  
Analysis. International mathematical journal of analysis and its applications     Hybrid Journal   (Followers: 5)
Anargya : Jurnal Ilmiah Pendidikan Matematika     Open Access   (Followers: 3)
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: 4)
Annals of Data Science     Hybrid Journal   (Followers: 13)
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: 3)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 14)
Annals of PDE     Hybrid Journal   (Followers: 1)
Annals of Pure and Applied Logic     Open Access   (Followers: 4)
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   (Followers: 2)
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: 3)
Applications of Mathematics     Hybrid Journal   (Followers: 3)
Applied Categorical Structures     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 14)
Applied Mathematics     Open Access   (Followers: 4)
Applied Mathematics     Open Access   (Followers: 8)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 10)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal   (Followers: 1)
Applied Mathematics and Nonlinear Sciences     Open Access  
Applied Mathematics Letters     Full-text available via subscription   (Followers: 4)
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: 4)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3)
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   (Followers: 1)
Asian-European Journal of Mathematics     Hybrid Journal   (Followers: 3)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 5)
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: 2)
Basin Research     Hybrid Journal   (Followers: 5)
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: 2)
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 18)
Bruno Pini Mathematical Analysis Seminar     Open Access  
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 13)
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: 2)
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: 1)
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: 22)
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: 3)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals : X     Open Access  
ChemSusChem     Hybrid Journal   (Followers: 8)
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  
Ciencia     Open Access   (Followers: 1)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
CODEE Journal     Open Access   (Followers: 3)
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: 15)
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: 4)
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: 9)
Compositio Mathematica     Full-text available via subscription  
Comptes Rendus Mathematique     Full-text available via subscription  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 4)
Computational and Mathematical Methods     Hybrid Journal  
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: 9)
Computational Mechanics     Hybrid Journal   (Followers: 5)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 9)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 11)
Concrete Operators     Open Access   (Followers: 4)
Confluentes Mathematici     Hybrid Journal  
Contributions to Discrete Mathematics     Open Access   (Followers: 3)
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)
Daya Matematis : Jurnal Inovasi Pendidikan Matematika     Open Access   (Followers: 2)
Demographic Research     Open Access   (Followers: 15)
Demonstratio Mathematica     Open Access  

        1 2 3 4 5 | Last

Similar Journals
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  [2626 journals]
  • A Note on Constacyclic and Quasi-cyclic Codes over $${\mathbb
           {F}}_2+u{\mathbb {F}}_2+v{\mathbb {F}}_2+uv{\mathbb {F}}_2$$ F 2 + u F 2 +
           v F 2 + u v F 2
    • Abstract: In this paper, we study \((1+\lambda u)\) -constacyclic codes of length \(2^k\) over the ring \(\mathrm {R}={\mathbb {F}}_2+u{\mathbb {F}}_2+v{\mathbb {F}}_2+uv{\mathbb {F}}_2\) , where \(u^2=v^2=0,\ uv=vu\) , k is a positive integer and \(\lambda \) is a unit in \(\mathrm {R}\) . We classify all \((1+\lambda u)\) -constacyclic codes of length \(2^k\) over \(\mathrm {R}\) . We also completely classify the structure of \((1+\lambda u)\) -constacyclic codes of length \(2^k\) over \(\mathrm {R}\) that are contained in their annihilators as well as equal to their annihilators. We enumerate these codes and present mass formulas for them. Some optimal codes are obtained as the Gray images of these codes. In addition, we also study the structure of 1-generator generalized quasi-cyclic codes over the ring \(\mathrm {R}\) . A minimal spanning set for these codes is determined. A BCH-type bound on the minimum distance of these codes is also presented.
      PubDate: 2019-03-20
  • Resolutions and Stability of Gorenstein Classes of Modules
    • Abstract: Let \(\mathcal {X}\) , \(\mathcal {U}\) and \(\mathcal {Z}\) be classes of left R-modules, \(\mathcal {W}\) be a class of right R-modules and \(\mathcal {X}\subseteq \mathcal {U}\) . In this paper, we investigate the relationship between \(\mathcal {Z}\) -proper (resp. \(\mathcal {Z}\) -coproper, \(\mathcal {W}\) -pure) \(\mathcal {U}\) -(co)resolutions and \(\mathcal {Z}\) -proper (resp. \(\mathcal {Z}\) -coproper, \(\mathcal {W}\) -pure) \(\mathcal {X}\) -(co)resolutions. As applications, we give an affirmative answer to the stability question on Gorenstein classes of modules, which unify the corresponding results possessed by some known Gorenstein classes of modules.
      PubDate: 2019-03-18
  • The Asymptotic Stability of the Solution to the Full Hall-MHD System in
           $$\mathbb {R}^3$$ R 3
    • Abstract: In this paper, we consider the asymptotic stability of the solutions near a constant equilibrium state to the Cauchy problem for the compressible full Hall-MHD equations in \(\mathbb {R}^3\) . We employ the energy estimate and introduce the negative Sobolev and Besov spaces to get the global existence and decay rates of the solution under the assumption that the \(H^3\) norm of the initial perturbation is small. As an immediate byproduct, the \(L^p-L^2\) \((1\leqslant p\leqslant 2)\) type of the decay rates follows without requiring the smallness for \(L^p\) norm of initial data.
      PubDate: 2019-03-14
  • On the Stabilization of a Memory-Type Porous Thermoelastic System
    • Abstract: In this work, we consider a one-dimensional porous thermoelastic system with memory effects. We prove a general decay result, for which exponential and polynomial decay results are special cases, depending only on the kernel of the memory effects. Our result is established irrespective of the wave speeds of the system. The result obtained is new and improves previous results in the literature.
      PubDate: 2019-03-14
  • Properties of Some of Two-Variable Orthogonal Polynomials
    • Abstract: The present paper deals with various recurrence relations, generating functions and series expansion formulas for two families of orthogonal polynomials in two variables, given Laguerre–Laguerre Koornwinder polynomials and Laguerre–Jacobi Koornwinder polynomials in the limit cases. Several families of bilinear and bilateral generating functions are derived. Furthermore, some special cases of the results presented in this study are indicated.
      PubDate: 2019-03-14
  • Oscillation Properties for the Dirac Equation with Spectral Parameter in
           the Boundary Condition
    • Abstract: In this paper, we consider the boundary value problem for the one-dimensional Dirac system with spectral parameter in the boundary condition. We completely study the oscillatory properties of components of the eigenvector functions of this problem.
      PubDate: 2019-03-12
  • Qualitative Spectral Analysis of Singular q -Sturm–Liouville
    • Abstract: This paper considers properties of the spectrum of q-Sturm–Liouville operator derived from the q-Sturm–Liouville expression $$\begin{aligned} Ly:=-\frac{1}{q}D_{q^{-1}}\left( p(x)D_{q}y(x)\right) +r\left( x\right) y(x),\quad 0<x<a\le \infty . \end{aligned}$$ We prove that the regular symmetric q-Sturm–Liouville operator is semi-bounded from below. Using splittings technique, we will give some conditions for the self-adjoint operator associated with the singular q-Sturm–Liouville expression to have a discrete spectrum. We also investigate the continuous spectrum of this operator.
      PubDate: 2019-03-12
  • Spherically Symmetric Solutions of the Full Compressible Euler Equations
           in $$R^N$$ R N
    • Abstract: This paper focuses on the multidimensional spherically symmetric full compressible Euler equations and constructs rigorously a family of global self-similar bounded weak solutions for all positive time to its initial value problem with constant initial data. The main approach is to reduce the full compressible Euler equations to an autonomous system of ordinary differential equations under the spherically symmetric and self-similar assumptions. We establish the detailed structures of solutions as well as their existence by analyzing carefully the properties of the integral curves of the autonomous ODE system.
      PubDate: 2019-03-08
  • On Ulam Stability of a Linear Difference Equation in Banach Spaces
    • Abstract: We obtain a result on Ulam stability and on the best Ulam constant for the linear difference equation \(x_{n+2}=ax_{n+1}+bx_n,\) where \(\mathbb {K}\) is one of the fields \(\mathbb {R}\) or \(\mathbb {C},\) \(a,b \in \mathbb {K}\) and \((x_n)_{n\ge 0}\) is a sequence in a Banach space X over the field \(\mathbb {K}.\) In this way, we improve and complement some recent results on Ulam stability of the second-order linear difference equation with constant coefficients.
      PubDate: 2019-02-22
  • Simple Effective Estimation of a Smooth Alternating Series
    • Abstract: The 2-periodic function, \(W^*\in C^2({\mathbb {R}})\) is constructed in such a way that the sum \(\sum _{k=1}^n(-1)^{k+1}f(k)\) can be efficiently estimated for any \(n\in {\mathbb {N}}\cup \{\infty \} \) and for every \(f\in C^4[1,\infty )\) having \(\int _1^{\infty }\big f^{(4)}(x)\big \,\mathrm {d}\,x<\infty \) .
      PubDate: 2019-02-21
  • A Survey of Fixed Point Theorems Under Pata-Type Conditions
    • Abstract: We present a survey of various variants of fixed point results for single- and multivalued mappings, under conditions of the type first used by Pata (J Fixed Point Theory Appl 10:299–305, 2011). A number of examples are given, showing the effectiveness of these results. Some recent misinterpretations of the use of Pata-type conditions are commented.
      PubDate: 2019-02-19
  • Exterior Dirichlet and Neumann Problems in Domains with Random Boundaries
    • Abstract: An approximation of statistical moments of solutions to exterior Dirichlet and Neumann problems with random boundary surfaces is investigated. A rigorous shape calculus approach has been used to approximate these statistical moments by those of the corresponding shape derivatives, which are computed by boundary integral equation methods. Examples illustrate our theoretical results.
      PubDate: 2019-02-18
  • Green Function for Gradient Perturbation of Unimodal Lévy Processes
           in the Real Line
    • Abstract: We prove that the Green function of the generator of symmetric unimodal Lévy process with the weak lower scaling order bigger than one and the Green functions of its gradient perturbations are comparable for bounded \(C^{1,1}\) subsets of the real line if the drift function is from an appropriate Kato class.
      PubDate: 2019-02-18
  • On Fractional p -Laplacian Equations at Resonance
    • Abstract: This article shows the existence of weak solutions of a resonant problem for a fractional p-Laplacian equation in a bounded domain in \({\mathbb {R}}^N\) . Our arguments are based on the Minimum principle, saddle point theorem and rely on a generalization of the Landesman–Lazer-type condition.
      PubDate: 2019-02-18
  • Pell and Pell–Lucas Numbers as Sums of Two Repdigits
    • Abstract: In this paper, we find all Pell and Pell–Lucas numbers expressible as sums of two base 10 repdigits.
      PubDate: 2019-02-15
  • Poisson Approximation for Call Function via Stein–Chen Method
    • Abstract: Let V be a sums of independent nonnegative integer-valued random variables and \(h_z\) be a call function defined by \(h_{z}(v)=(v-z)^+\) for \(v\ge 0, z \ge 0\) where \((v-z)^+=\max \{v-z,0\}\) . In this paper, we give bounds of Poisson approximation for \({E}[h_{z}(V)]\) . These bounds improve the results of Jiao and Karoui (Finance Stoch 13(2):151–180, 2009). The technique used is Stein–Chen method with the zero bias transformation. One example of applications for a call function in finance is the standard collateralized debt obligation (CDO) tranche pricing. The CDO is a security backed by a diversified pool of debt obligation such as bounds, loans and credit default swaps.
      PubDate: 2019-02-13
  • On Linear Quotients of Squarefree Monomial Ideals
    • Abstract: Let \(I\subset K[x_1,\ldots ,x_n]\) be a squarefree monomial ideal generated in one degree. Let \(G_I\) be the graph whose nodes are the generators of I, and two vertices \(u_i\) and \(u_{ j}\) are adjacent if there exist variables x, y such that \(xu_i = yu_j\) . We show that if I is generated in degree \(n-2\) , then the following are equivalent: \(G_I\) is a connected graph; I has a \((n-2)\) -linear resolution; I has linear quotients; I is a variable-decomposable ideal. We also prove that if I has linear relations and \(\overline{G_I}\) is chordal, then I has linear quotients.
      PubDate: 2019-02-07
  • Extremal Digraphs for an Upper Bound on the Double Roman Domination Number
    • Abstract: A doubleRoman dominating function of a digraph D is a function \(f:V\longrightarrow \{0,1,2,3\}\) such that every vertex u for which \(f(u)=0\) has an in-neighbor v for which \(f(v)=3\) or at least two in-neighbors assigned 2 under f, while if \(f(u)=1\) , then the vertex u must have at least one in-neighbor assigned 2 or 3. The weight of a double Roman dominating function is the value \(f(V)=\sum _{u\in V}f(u)\) . The minimum weight of a double Roman dominating function of a digraph D is called the double Roman domination number of D, denoted by \(\gamma _{dR}\left( D\right) \) . This paper gives a descriptive characterization for some classes of digraphs satisfying \(\gamma _{dR}(D)=2\left( n-\Delta ^{+}(D)\right) +1\) . Also, a descriptive characterization for digraphs D of order \(n\ge 4\) for which \(\gamma _{dR}(D)+\gamma _{dR}({\overline{D}})=2n+3\) holds where \({\overline{D}}\) is the complement of D.
      PubDate: 2019-02-05
  • Fréchet Derivative and Analytic Functional Calculus
    • Abstract: We calculate Fréchet derivatives of the mapping \(a\mapsto f(a)\) , where a is a member of a complex unital Banach algebra and f is a complex analytic function in a neighborhood of the spectrum of a. Thus, the connection between the Fréchet derivative and the analytic functional calculus is established.
      PubDate: 2019-01-30
  • Post-Lie Algebra Structures on the Witt Algebra
    • Abstract: In this paper, we characterize the graded post-Lie algebra structures and a class of shifting post-Lie algebra structures on the Witt algebra. As an application, the homogeneous Rota–Baxter operators and a class of non-homogeneous Rota–Baxter operators of weight 1 on the Witt algebra are studied.
      PubDate: 2019-01-29
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