Subjects -> MATHEMATICS (Total: 1013 journals)
    - APPLIED MATHEMATICS (92 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (714 journals)
    - MATHEMATICS (GENERAL) (45 journals)
    - NUMERICAL ANALYSIS (26 journals)
    - PROBABILITIES AND MATH STATISTICS (113 journals)

MATHEMATICS (714 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 3)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 4)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 13)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 5)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 6)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 41)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 2)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 3)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 5)
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: 5)
Advances in Catalysis     Full-text available via subscription   (Followers: 7)
Advances in Complex Systems     Hybrid Journal   (Followers: 10)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 20)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 2)
Advances in Fixed Point Theory     Open Access  
Advances in Geosciences (ADGEO)     Open Access   (Followers: 19)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 9)
Advances in Materials Science     Open Access   (Followers: 20)
Advances in Mathematical Physics     Open Access   (Followers: 6)
Advances in Mathematics     Full-text available via subscription   (Followers: 21)
Advances in Numerical Analysis     Open Access   (Followers: 4)
Advances in Operations Research     Open Access   (Followers: 13)
Advances in Operator Theory     Hybrid Journal  
Advances in Pure Mathematics     Open Access   (Followers: 9)
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: 7)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 5)
Afrika Matematika     Hybrid Journal   (Followers: 2)
Air, Soil & Water Research     Open Access   (Followers: 6)
AKSIOMATIK : Jurnal Penelitian Pendidikan dan Pembelajaran Matematika     Open Access  
Al-Jabar : Jurnal Pendidikan Matematika     Open Access  
Al-Qadisiyah Journal for Computer Science and Mathematics     Open Access   (Followers: 2)
AL-Rafidain Journal of Computer Sciences and Mathematics     Open Access   (Followers: 3)
Algebra and Logic     Hybrid Journal   (Followers: 7)
Algebra Colloquium     Hybrid Journal   (Followers: 1)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Open Access   (Followers: 5)
Algorithms     Open Access   (Followers: 13)
Algorithms Research     Open Access   (Followers: 1)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 8)
American Journal of Mathematical Analysis     Open Access   (Followers: 1)
American Journal of Mathematical and Management Sciences     Hybrid Journal  
American Journal of Mathematics     Full-text available via subscription   (Followers: 8)
American Journal of Operations Research     Open Access   (Followers: 6)
American Mathematical Monthly     Full-text available via subscription   (Followers: 3)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 12)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access  
Analysis and Applications     Hybrid Journal   (Followers: 2)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 9)
Anargya : Jurnal Ilmiah Pendidikan Matematika     Open Access  
Annales Mathematicae Silesianae     Open Access  
Annales mathématiques du Québec     Hybrid Journal   (Followers: 3)
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: 14)
Annals of Functional Analysis     Hybrid Journal   (Followers: 2)
Annals of Mathematics     Full-text available via subscription   (Followers: 5)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 16)
Annals of PDE     Hybrid Journal  
Annals of Pure and Applied Logic     Open Access   (Followers: 4)
Annals of the Alexandru Ioan Cuza University - Mathematics     Open Access   (Followers: 1)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1)
Annals of West University of Timisoara - Mathematics     Open Access   (Followers: 1)
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: 2)
Applied Categorical Structures     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Mathematics     Open Access   (Followers: 7)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 11)
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: 1)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 1)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 4)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 3)
Arabian Journal of Mathematics     Open Access   (Followers: 1)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 4)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Armenian Journal of Mathematics     Open Access  
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites     Open Access   (Followers: 22)
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: 2)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
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: 2)
Banach Journal of Mathematical Analysis     Hybrid Journal  
Basin Research     Hybrid Journal   (Followers: 7)
BIBECHANA     Open Access  
Biomath     Open Access  
BIT Numerical Mathematics     Hybrid Journal  
Boletim Cearense de Educação e História da Matemática     Open Access  
Boletín de la Sociedad Matemática Mexicana     Hybrid Journal  
Bollettino dell'Unione Matematica Italiana     Full-text available via subscription  
British Journal for the History of Mathematics     Hybrid Journal   (Followers: 2)
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 18)
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 1)
Bulletin des Sciences Mathamatiques     Full-text available via subscription   (Followers: 3)
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: 4)
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  
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: 20)
Canadian Mathematical Bulletin     Hybrid Journal  
Carpathian Mathematical Publications     Open Access  
Catalysis in Industry     Hybrid Journal  
CAUCHY     Open Access   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 6)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 1)
Chaos, Solitons & Fractals : X     Open Access   (Followers: 1)
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  
Ciencia     Open Access  
CODEE Journal     Open Access  
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 2)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Hybrid Journal   (Followers: 3)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 18)
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: 6)
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Compositio Mathematica     Full-text available via subscription   (Followers: 2)
Comptes Rendus : Mathematique     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 3)
Computational and Mathematical Methods     Hybrid Journal  
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 1)
Computational Complexity     Hybrid Journal   (Followers: 5)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 11)
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: 9)
Confluentes Mathematici     Hybrid Journal  
Constructive Mathematical Analysis     Open Access  
Contributions to Discrete Mathematics     Open Access  
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal   (Followers: 1)
Cross Section     Full-text available via subscription   (Followers: 1)
Cryptography and Communications     Hybrid Journal   (Followers: 11)
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  
Daya Matematis : Jurnal Inovasi Pendidikan Matematika     Open Access  
Demographic Research     Open Access   (Followers: 14)
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 33)
Desimal : Jurnal Matematika     Open Access  
Dhaka University Journal of Science     Open Access  
Differential Equations and Dynamical Systems     Hybrid Journal   (Followers: 2)
Differentsial'nye Uravneniya     Open Access  
Digital Experiences in Mathematics Education     Hybrid Journal   (Followers: 3)
Discrete Mathematics     Hybrid Journal   (Followers: 8)
Discrete Mathematics & Theoretical Computer Science     Open Access   (Followers: 1)
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  
Doklady Akademii Nauk     Open Access  
Doklady Mathematics     Hybrid Journal  
Eco Matemático     Open Access  
Econometrics     Open Access   (Followers: 2)

        1 2 3 4 | Last

Similar Journals
Journal Cover
Czechoslovak Mathematical Journal
Journal Prestige (SJR): 0.307
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1572-9141 - ISSN (Online) 0011-4642
Published by Springer-Verlag Homepage  [2469 journals]
  • On an additive problem of unlike powers in short intervals

    • Free pre-print version: Loading...

      Abstract: Abstract We prove that almost all positive even integers n can be represented as p 2 2 + p 3 3 + p 4 4 + p 5 5 with \(\left {p_k^k - {1 \over 4}N} \right \leqslant {N^{1 - 1/54 + \varepsilon }}\) for 2 ⩽ k ⩽ 5. As a consequence, we show that each sufficiently large odd integer N can be written as p1 + p 2 2 + p 3 3 + p 4 4 + p 5 5 with \(\left {p_k^k - {1 \over 5}N} \right \leqslant {N^{1 - 1/54 + \varepsilon }}\) for 1 ⩽ k ⩽ 5.
      PubDate: 2022-06-06
       
  • Truncations of Gauss’ square exponent theorem

    • Free pre-print version: Loading...

      Abstract: Abstract We establish two truncations of Gauss’ square exponent theorem and a finite extension of Euler’s identity. For instance, we prove that for any positive integer n $$\sum\limits_{k = 0}^n {{{\left( { - 1} \right)}^k}\left[ {\matrix{{2n - k} \cr k \cr } } \right]\,\,{{\left( {q;{q^2}} \right)}_{n - k}}{q^{\left( {\matrix{{k + 1} \cr 2 \cr } } \right)}} = \sum\limits_{k = - n}^n {{{\left( { - 1} \right)}^k}{q^{{k^2}}},} } $$ where $$\left[ {\matrix{n \cr m \cr } } \right] = \prod\limits_{k = 1}^m {{{1 - {q^{n - k + 1}}} \over {1 - {q^k}}}\,\,\,\,{\rm{and}}\,\,\,\,{{\left( {a;q} \right)}_n} = \prod\limits_{k = 0}^{n - 1} {\left( {1 - a{q^k}} \right).} } $$
      PubDate: 2022-06-06
       
  • On a family of elliptic curves of rank at least 2

    • Free pre-print version: Loading...

      Abstract: Abstract Let Cm:y2 = x3 − m2x + p2q2 be a family of elliptic curves over ℚ, where m is a positive integer and p, q are distinct odd primes. We study the torsion part and the rank of Cm(ℚ). More specifically, we prove that the torsion subgroup of Cm(ℚ) is trivial and the ℚ-rank of this family is at least 2, whenever m ≢ 0 (mod 3), m ≢ 0 (mod 4) and m ≡ 2 (mod 64) with neither p nor q dividing m.
      PubDate: 2022-06-06
       
  • Maximum bipartite subgraphs in H-free graphs

    • Free pre-print version: Loading...

      Abstract: Abstract Given a graph G, let f(G) denote the maximum number of edges in a bipartite subgraph of G. Given a fixed graph H and a positive integer m, let f(m, H) denote the minimum possible cardinality of f(G), as G ranges over all graphs on m edges that contain no copy of H. In this paper we prove that \(f\left( {m,{\theta _{k,s}}} \right) \geqslant {1 \over 2}m + \Omega \left( {{m^{\left( {2k + 1} \right)/\left( {2k + 2} \right)}}} \right)\) , which extends the results of N. Alon, M. Krivelevich, B. Sudakov. Write K k ′ and K t,s ′ for the subdivisions of Kk and Kt,s. We show that \(f\left( {m,K_k^\prime } \right) \geqslant {1 \over 2}m + \Omega \left( {{m^{\left( {5k - 8} \right)/\left( {6k - 10} \right)}}} \right)\) and \(f\left( {m,K_{t,s}^\prime } \right) \geqslant {1 \over 2}m + \Omega \left( {{m^{\left( {5t - 1} \right)/\left( {6t - 2} \right)}}} \right)\) , improving a result of Q. Zeng, J. Hou. We also give lower bounds on wheel-free graphs. All of these contribute to a conjecture of N. Alon, B. Bollobás, M. Krivelevich, B. Sudakov (2003).
      PubDate: 2022-06-03
       
  • The relation between the number of leaves of a tree and its diameter

    • Free pre-print version: Loading...

      Abstract: Abstract Let L(n, d) denote the minimum possible number of leaves in a tree of order n and diameter d. Lesniak (1975) gave the lower bound B(n,d) = ⌈2(n − 1)/d⌉ for L(n,d). When d is even, B(n,d) = L(n,d). But when d is odd, B(n,d) is smaller than L(n,d) in general. For example, B(21, 3) = 14 while L(21, 3) = 19. In this note, we determine L(n, d) using new ideas. We also consider the converse problem and determine the minimum possible diameter of a tree with given order and number of leaves.
      PubDate: 2022-06-01
       
  • On Bernstein inequalities for multivariate trigonometric polynomials in
           Lp, 0 ⩽ p ⩽ ∞

    • Free pre-print version: Loading...

      Abstract: Abstract Let \({{\mathbb{T}}_n}\) be the space of all trigonometric polynomials of degree not greater than n with complex coefficients. Arestov extended the result of Bernstein and others and proved that \({\left\ {(1/n)T_n^\prime } \right\ _p} \leqslant {\left\ {{T_n}} \right\ _p}\) for 0 ⩽ p ⩽ ∞ and \({T_n} \in {{\mathbb{T}}_n}\) . We derive the multivariate version of the result of Golitschek and Lorentz $${\left\ {{{\left {{T_n}\cos \alpha + {1 \over n}\nabla {T_n}\sin \alpha } \right }_{l_\infty ^{(m)}}}} \right\ _p} \leqslant{\left\ {{T_n}} \right\ _p},\,\,\,\,\,\,\,0 \leqslant p \leqslant\infty $$ for all trigonometric polynomials (with complex coefficients) in m variables of degree at most n.
      PubDate: 2022-06-01
       
  • New Einstein metrics on Sp(n) which are non-naturally reductive

    • Free pre-print version: Loading...

      Abstract: Abstract We prove that there are at least two new non-naturally reductive Ad(Sp(l) × Sp(k) × Sp(k) × Sp(k)) invariant Einstein metrics on Sp(l + 3k) (k < l). It implies that every compact simple Lie group Sp(n) for n = l + 3k > 4 admits at least \(2[{1 \over 4}(n - 1)]\) non-naturally reductive Ad(Sp(l) × Sp(k) × Sp(k) × Sp(k)) invariant Einstein metrics.
      PubDate: 2022-06-01
       
  • The Massera-Schäffer problem for a first order linear differential
           equation

    • Free pre-print version: Loading...

      Abstract: Abstract We consider the Massera-Schäffer problem for the equation $$ - y\prime (x) + q(x)y(x) = f(x),\,\,\,\,\,x \in \mathbb{R},$$ where \(f \in L_p^{{\rm{loc}}}(\mathbb{R})\) , p ∈ [1, ∞) and \(0 \leqslant q \in L_p^{{\rm{loc}}}(\mathbb{R})\) . By a solution of the problem we mean any function y, absolutely continuous and satisfying the above equation almost everywhere in \(\mathbb{R}\) . Let positive and continuous functions μ(x) and θ(x) for \(x \in \mathbb{R}\) be given. Let us introduce the spaces $$\matrix{{{L_p}(\mathbb{R},\mu ) = \left\{ {f \in L_p^{{\rm{loc}}}(\mathbb{R}):\left\ f \right\ _{{L_p}(\mathbb{R},\mu )}^p = \int_{ - \infty }^\infty {{{\left {\mu (x)f(x)} \right }^p}{\rm{d}}x < \infty } } \right\},} \hfill \cr {{L_p}(\mathbb{R},\theta ) = \left\{ {f \in L_p^{{\rm{loc}}}(\mathbb{R}):\left\ f \right\ _{{L_p}(\mathbb{R},\theta )}^p = \int_{ - \infty }^\infty {{{\left {\theta (x)f(x)} \right }^p}{\rm{d}}x < \infty } } \right\}.} \hfill \cr } $$ We obtain requirements to the functions μ θ and q under which (1) for every function \(f \in {L_p}(\mathbb{R},\theta )\) there exists a unique solution \(y \in {L_p}(\mathbb{R},\mu )\) of the above equation; (2) there is an absolute constant c(p) ∈ (0, ∞) such that regardless of the choice of a function \(f \in {L_p}(\mathbb{R},\theta )\) the solution of the above equation satisfies the inequality $${\left\ y \right\ _{{L_p}(\mathbb{R},\mu )}} \leqslant c(p){\left\ f \right\ _{{L_p}(\mathbb{R},\theta ).}}$$ .
      PubDate: 2022-06-01
       
  • Extension of semiclean rings

    • Free pre-print version: Loading...

      Abstract: Abstract This paper aims at the study of the notions of periodic, UU and semiclean properties in various context of commutative rings such as trivial ring extensions, amalgamations and pullbacks. The results obtained provide new original classes of rings subject to various ring theoretic properties.
      PubDate: 2022-06-01
       
  • Wiener index of graphs with fixed number of pendant or cut-vertices

    • Free pre-print version: Loading...

      Abstract: Abstract The Wiener index of a connected graph is defined as the sum of the distances between all unordered pairs of its vertices. We characterize the graphs which extremize the Wiener index among all graphs on n vertices with k pendant vertices. We also characterize the graph which minimizes the Wiener index over the graphs on n vertices with s cut-vertices.
      PubDate: 2022-06-01
       
  • On the symmetric algebra of certain first syzygy modules

    • Free pre-print version: Loading...

      Abstract: Abstract Let (R, \(\mathfrak{m}\) ) be a standard graded K-algebra over a field K. Then R can be written as S/I, where I ⊆ (x1,…, xn)2 is a graded ideal of a polynomial ring S = K[x1,…, xn]. Assume that n ⩽ 3 and I is a strongly stable monomial ideal. We study the symmetric algebra SymR(Syz1( \(\mathfrak{m}\) )) of the first syzygy module Syz1( \(\mathfrak{m}\) ) of \(\mathfrak{m}\) . When the minimal generators of I are all of degree 2, the dimension of SymR (Syz1( \(\mathfrak{m}\) )) is calculated and a lower bound for its depth is obtained. Under suitable conditions, this lower bound is reached.
      PubDate: 2022-06-01
       
  • Degree sums of adjacent vertices for traceability of claw-free graphs

    • Free pre-print version: Loading...

      Abstract: Abstract The line graph of a graph G, denoted by L(G), has E(G) as its vertex set, where two vertices in L(G) are adjacent if and only if the corresponding edges in G have a vertex in common. For a graph H, define \({\overline \sigma _2}(H) = \min \left\{{d(u) + d(v):\;\;uv\; \in \;E(H)} \right\}\) . Let H be a 2-connected claw-free simple graph of order n with δ(H) ⩾ 3. We show that, if \({\overline \sigma _2}(H)\geqslant {1 \over 7}(2n - 5)\) and n is sufficiently large, then either H is traceable or the Ryjáček’s closure cl(H) = L(G), where G is an essentially 2-edge-connected triangle-free graph that can be contracted to one of the two graphs of order 10 which have no spanning trail. Furthermore, if \({\overline \sigma _2}(H)\; > \;{1 \over 3}(n - 6)\) and n is sufficiently large, then H is traceable. The bound \({1 \over 3}(n - 6)\) is sharp. As a byproduct, we prove that there are exactly eight graphs in the family \({\cal G}\) of 2-edge-connected simple graphs of order at most 11 that have no spanning trail, an improvement of the result in Z. Niu et al. (2012).
      PubDate: 2022-06-01
       
  • Solutions of the generalized Dirichlet problem for the iterated slice
           Dirac equation

    • Free pre-print version: Loading...

      Abstract: Abstract Applying the method of normalized systems of functions we construct solutions of the generalized Dirichlet problem for the iterated slice Dirac operator in Clifford analysis. This problem is a natural generalization of the Dirichlet problem.
      PubDate: 2022-06-01
       
  • On the Choquet integrals associated to Bessel capacities

    • Free pre-print version: Loading...

      Abstract: Abstract We characterize the Choquet integrals associated to Bessel capacities in terms of the preduals of the Sobolev multiplier spaces. We make use of the boundedness of local Hardy-Littlewood maximal function on the preduals of the Sobolev multiplier spaces and the minimax theorem as the main tools for the characterizations.
      PubDate: 2022-06-01
       
  • A convex treatment of numerical radius inequalities

    • Free pre-print version: Loading...

      Abstract: Abstract We prove an inner product inequality for Hilbert space operators. This inequality will be utilized to present a general numerical radius inequality using convex functions. Applications of the new results include obtaining new forms that generalize and extend some well known results in the literature, with an application to the newly defined generalized numerical radius. We emphasize that the approach followed in this article is different from the approaches used in the literature to obtain such versions.
      PubDate: 2022-06-01
       
  • On the multiplicity of Laplacian eigenvalues for unicyclic graphs

    • Free pre-print version: Loading...

      Abstract: Abstract Let G be a connected graph of order n and U a unicyclic graph with the same order. We firstly give a sharp bound for mG(μ), the multiplicity of a Laplacian eigenvalue μ of G. As a straightforward result, mU(1) ⩽ n − 2. We then provide two graph operations (i.e., grafting and shifting) on graph G for which the value of mG(1) is nondecreasing. As applications, we get the distribution of mU (1) for unicyclic graphs on n vertices. Moreover, for the two largest possible values of mU(1) ∈ {n − 5, n − 3}, the corresponding graphs U are completely determined.
      PubDate: 2022-06-01
       
  • Local cohomology, cofiniteness and homological functors of modules

    • Free pre-print version: Loading...

      Abstract: Abstract Let I be an ideal of a commutative Noetherian ring R. It is shown that the R-modules H I j (M) are I-cofinite for all finitely generated R-modules M and all j ∈ ℕ0 if and only if the R-modules Ext R i (N,H I j (M)) and Tor R i (N, H I j (M)) are I-cofinite for all finitely generated R-modules M, N and all integers i, j ∈ ℕ0.
      PubDate: 2022-06-01
       
  • Isolated Subgroups of Finite Abelian Groups

    • Free pre-print version: Loading...

      Abstract: Abstract We say that a subgroup H is isolated in a group G if for every x ∈ G we have either x ∈ H or 〈x〉 ∩ H = 1. We describe the set of isolated subgroups of a finite abelian group. The technique used is based on an interesting connection between isolated subgroups and the function sum of element orders of a finite group.
      PubDate: 2022-03-04
      DOI: 10.21136/CMJ.2022.0085-21
       
  • Regularity and Intersections of Bracket Powers

    • Free pre-print version: Loading...

      Abstract: Abstract Among reduced Noetherian prime characteristic commutative rings, we prove that a regular ring is precisely that where the finite intersection of ideals commutes with taking bracket powers. However, reducedness is essential for this equivalence. Connections are made with Ohm-Rush content theory, intersection-flatness of the Frobenius map, and various flatness criteria.
      PubDate: 2022-03-01
      DOI: 10.21136/CMJ.2022.0066-21
       
  • The Potential-Ramsey Number of Kn and K t −k

    • Free pre-print version: Loading...

      Abstract: Abstract A nonincreasing sequence π = (d1,…, dn) of nonnegative integers is a graphic sequence if it is realizable by a simple graph G on n vertices. In this case, G is referred to as a realization of π. Given two graphs G1 and G2, A. Busch et al. (2014) introduced the potential-Ramsey number of G1 and G2, denoted by rpot(G1, G2), as the smallest nonnegative integer m such that for every m-term graphic sequence π, there is a realization G of π with G1 ⊆ G or with \({G_2} \subseteq \overline G \) , where \(\overline G \) is the complement of G. For t ≽ 2 and \(0\leqslant k\leqslant \left\lfloor {{t \over 2}} \right\rfloor \) , let K t −k be the graph obtained from Kt by deleting k independent edges. We determine rpot (Kn, K t −k ) for \(t\geqslant 3,1\leqslant k\leqslant \left\lfloor {{t \over 2}} \right\rfloor \) and \(n\geqslant \left\lceil {\sqrt {2k}} \right\rceil \) , which gives the complete solution to a result in J. Z. Du, J. H. Yin (2021).
      PubDate: 2022-03-01
      DOI: 10.21136/CMJ.2022.0017-21
       
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


Your IP address: 44.192.65.228
 
Home (Search)
API
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-