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: 4)
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: 43)
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: 6)
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: 16)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 3)
Advances in Fixed Point Theory     Open Access  
Advances in Geosciences (ADGEO)     Open Access   (Followers: 20)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 6)
Advances in Materials Science     Open Access   (Followers: 21)
Advances in Mathematical Physics     Open Access   (Followers: 6)
Advances in Mathematics     Full-text available via subscription   (Followers: 18)
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: 10)
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: 8)
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: 3)
AL-Rafidain Journal of Computer Sciences and Mathematics     Open Access   (Followers: 4)
Algebra and Logic     Hybrid Journal   (Followers: 9)
Algebra Colloquium     Hybrid Journal   (Followers: 3)
Algebra Universalis     Hybrid Journal   (Followers: 3)
Algorithmic Operations Research     Open Access   (Followers: 6)
Algorithms     Open Access   (Followers: 14)
Algorithms Research     Open Access   (Followers: 1)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 4)
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: 7)
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: 7)
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: 15)
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: 13)
Annals of PDE     Hybrid Journal  
Annals of Pure and Applied Logic     Open Access   (Followers: 5)
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)
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: 5)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 7)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal   (Followers: 1)
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: 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: 21)
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: 5)
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: 6)
BIBECHANA     Open Access  
Biomath     Open Access  
BIT Numerical Mathematics     Hybrid Journal  
Boletim Cearense de Educação e História da Matemática     Open Access  
Boletim de Educação Matemática     Open Access  
Boletín de la Sociedad Matemática Mexicana     Hybrid Journal  
Bollettino dell'Unione Matematica Italiana     Full-text available via subscription  
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)
British Journal of Mathematics & Computer Science     Full-text available via subscription   (Followers: 1)
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 2)
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: 3)
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   (Followers: 1)
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: 5)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 1)
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: 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: 3)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Hybrid Journal   (Followers: 3)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 5)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 20)
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: 3)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 6)
Complex Analysis and its Synergies     Open Access   (Followers: 1)
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: 2)
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: 10)
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: 35)
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: 7)
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  

        1 2 3 4 | Last

Similar Journals
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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  [2467 journals]
  • Unimodular rows over Laurent polynomial rings

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      Abstract: Abstract We prove that for any ring R of Krull dimension not greater than 1 and n ⩾ 3, the group En (R[X, X−1]) acts transitively on Umn(R[X, X−1]). In particular, we obtain that for any ring R with Krull dimension not greater than 1, all finitely generated stably free modules over R[X, X−1] are free. All the obtained results are proved constructively.
      PubDate: 2022-10-21
       
  • A Diophantine equation involving special prime numbers

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      Abstract: Abstract Let [·] be the floor function. In this paper, we prove by asymptotic formula that when \(1 < c < {{3441} \over {2539}}\) , then every sufficiently large positive integer N can be represented in the form $$N = \left[ {p_1^c} \right] + \left[ {p_2^c} \right] + \left[ {p_3^c} \right] + \left[ {p_4^c} \right] + \left[ {p_5^c} \right],$$ where p1, p2, p3, p4, p5 are primes such that p1 = x2 + y2 + 1.
      PubDate: 2022-10-20
       
  • On supercharacter theoretic generalizations of monomial groups and
           Artin’s conjecture

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      Abstract: Abstract We extend the notions of quasi-monomial groups and almost monomial groups in the framework of supercharacter theories, and we study their connection with Artin’s conjecture regarding the holomorphy of Artin L-functions.
      PubDate: 2022-10-19
       
  • Asymptotic behavior of small-data solutions to a
           Keller-Segel-Navier-Stokes system with indirect signal production

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      Abstract: Abstract We consider the Keller-Segel-Navier-Stokes system $$\left\{ {\begin{array}{*{20}{c}} {{n_t} + {\bf{u}} \cdot \nabla n = \Delta n - \nabla \cdot (n\nabla v),\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;}&{x \in \Omega ,\;t > 0,} \\ {{v_t} + {\bf{u}} \cdot \nabla v = \Delta v - v + w,\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;}&{x \in \Omega ,\;t > 0,} \\ {{w_t} + {\bf{u}} \cdot \nabla w = \Delta w - w + n,\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;}&{x \in \Omega ,\;t > 0,} \\ {{{\bf{u}}_t} + ({\bf{u}} \cdot \nabla ){\bf{u}} = \Delta {\bf{u}} + \nabla P + n\nabla \phi ,\;\nabla \cdot {\bf{u}} = 0,}&{x \in \Omega ,\;t > 0,} \end{array}} \right.$$ which is considered in bounded domain Ω ⊂ ℝN (N ∈ {2, 3}) with smooth boundary, where \(\phi \in {C^{1 + \delta }}\left( {\overline \Omega } \right)\) with δ ∈ (0, 1). We show that if the initial data \({\left\ {{n_0}} \right\ _{{L^{N/2}}\left( \Omega \right)}}\) , \({\left\ {\nabla {v_0}} \right\ _{{L^N}\left( \Omega \right)}}\) , \({\left\ {\nabla {w_0}} \right\ _{{L^N}\left( \Omega \right)}}\) and \({\left\ {{{\bf{u}}_0}} \right\ _{{L^N}\left( \Omega \right)}}\) is small enough, an associated initial-boundary value problem possesses a global classical solution which decays to the constant state ( \({\bar n_0},{\bar n_0},{\bar n_0},0\) ) exponentially with \({\bar n_0}: = \left( {1/\left \Omega \right } \right)\int_\Omega {{n_0}\left( x \right){\rm{d}}x} \) .
      PubDate: 2022-10-12
       
  • On ternary quadratic forms over the rational numbers

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      Abstract: Abstract For a ternary quadratic form over the rational numbers, we characterize the set of rational numbers represented by that form over the rational numbers. Consequently, we reprove the classical fact that any positive definite integral ternary quadratic form must fail to represent infinitely many positive integers over the rational numbers. Our proof uses only the quadratic reciprocity law and the Hasse-Minkowski theorem, and is elementary.
      PubDate: 2022-10-07
       
  • On sharp characters of type {−1, 0, 2}

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      Abstract: Abstract For a complex character χ of a finite group G, it is known that the product \({\rm{sh}}\left( \chi \right) = \prod\limits_{l \in L\left( \chi \right)} {\left( {\chi \left( 1 \right) - l} \right)} \) is a multiple of ∣G∣, where L(χ) is the image of χ on G − {1} The character χ is said to be a sharp character of type L if L = L(χ) and sh(χ) = ∣G∣. If the principal character of G is not an irreducible constituent of χ, then the character χ is called normalized. It is proposed as a problem by P. J. Cameron and M. Kiyota, to find finite groups G with normalized sharp characters of type {−1, 0, 2}. Here we prove that such a group with nontrivial center is isomorphic to the dihedral group of order 12.
      PubDate: 2022-10-06
       
  • On the Average Number of Sylow Subgroups in Finite Groups

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      Abstract: Abstract We prove that if the average number of Sylow subgroups of a finite group is less than \({{41} \over 5}\) and not equal to \({{29} \over 4}\) , then G is solvable or G/F(G) ≅ A5. In particular, if the average number of Sylow subgroups of a finite group is \({{29} \over 4}\) , then G/N ≅ A5, where N is the largest normal solvable subgroup of G. This generalizes an earlier result by Moretó et al.
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2021.0131-21
       
  • On Sums and Products in a Field

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      Abstract: Abstract We study sums and products in a field. Let F be a field with ch(F) ≠ 2, where ch(F) is the characteristic of F. For any integer k ⩾ 4, we show that any x ∈ F can be written as a1 + … + ak with a1, …, ak ∈ F and a1… ak = 1, and that for any α ∈ F {0} we can write every x ∈ F as a1 … ak with a1, …, ak ∈ F and a1 + … + ak = α. We also prove that for any x ∈ F and k ∈ {2, 3, …} there are a1, …, a2k ∈ F such that a1 + … + a2k = x = a1 … a2k.
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2021.0184-21
       
  • Inequalities for real number sequences with applications in spectral graph
           theory

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      Abstract: Abstract Let a = (a1,a2, …, an) be a nonincreasing sequence of positive real numbers. Denote by S = {1, 2, …, n} the index set and by Jk = {I = {r1, r2, …, rk}, 1 ⩽ r1 < r2 < … < rk ⩽ n} the set of all subsets of S of cardinality k, 1 ⩽ k ⩽ n − 1. In addition, denote by \({a_I} = {a_{{r_1}}} + {a_{{r_2}}} + \ldots + {a_{{r_k}}},\,\,1 \leqslant k \leqslant n - 1,\,\,1 \leqslant {r_1} < {r_2} < \ldots < {r_k} \leqslant n\) , the sum of k arbitrary elements of sequence a, where \({a_{{I_1}}} = {a_1} + {a_2} + \ldots + {a_k}\) and \({a_{{I_n}}} = {a_{n - k + 1}} + {a_{n - k + 2}} + \ldots + {a_n}\) . We consider bounds of the quantities \(R{S_k}(a) = {a_{{I_1}}}/{a_{{I_n}}},\,\,L{S_k}(a) = {a_{{I_1}}} - {a_{{I_n}}}\) and \({S_{k,\alpha}}(a) = \sum\limits_{I \in {J_k}} {a_I^\alpha}\) in terms of \(A = \sum\limits_{i = 1}^n {{a_i}} \) and \(B = \sum\limits_{i = 1}^n {a_i^2} \) . Then we use the obtained results to generalize some results regarding Laplacian and normalized Laplacian eigenvalues of graphs.
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2022.0155-21
       
  • Stable Tubes in Extriangulated Categories

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      Abstract: Abstract Let χ be a semibrick in an extriangulated category. If χ is a τ-semibrick, then the Auslander-Reiten quiver \(\Gamma ({\cal F}({\cal X}))\) of the filtration subcategory \({\cal F}({\cal X})\) generated by χ is \({\mathbb{ZA}_\infty}\) . If χ = {Xi} i=1 t is a τ-cycle semibrick, then \(\Gamma ({\cal F}({\cal X}))\) is \({\mathbb{ZA}_\infty}/{\tau _{\mathbb{A}}}\) .
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2022.0145-21
       
  • Congruences for certain families of Apéry-like sequences

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      Abstract: Abstract We systematically investigate the expressions and congruences for both a one-parameter family {Gn(x)} as well as a two-parameter family {Gn(r, m)} of sequences.
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2022.0224-21
       
  • Generic power series on subsets of the unit disk

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      Abstract: Abstract We examine the boundary behaviour of the generic power series f with coefficients chosen from a fixed bounded set Λ in the sense of Baire category. Notably, we prove that for any open subset U of the unit disk D with a nonreal boundary point on the unit circle, f(U) is a dense set of ℂ. As it is demonstrated, this conclusion does not necessarily hold for arbitrary open sets accumulating to the unit circle. To complement these results, a characterization of coefficient sets having this property is given.
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2022.0021-21
       
  • Bicrossed Products of Generalized Taft Algebra and Group Algebras

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      Abstract: Abstract Let G be a group generated by a set of finite order elements. We prove that any bicrossed product Hm,d(q) ⋈ k[G] between the generalized Taft algebra Hm,d(q) and group algebra k[G] is actually the smash product Hm,d(q)♯k[G]. Then we show that the classification of these smash products could be reduced to the description of the group automorphisms of G. As an application, the classification of \({H_{m,d}}(q)\bowtie k[{C_{{n_1}}} \times {C_{{n_2}}}]\) is completely presented by generators and relations, where Cn denotes the n-cyclic group.
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2022.0176-21
       
  • A Lower Bound Sequence for the Minimum Eigenvalue of Hadamard Product of
           an M-Matrix and its Inverse

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      Abstract: Abstract We propose a lower bound sequence for the minimum eigenvalue of Hadamard product of an M-matrix and its inverse, in terms of an S-type eigenvalues inclusion set and inequality scaling techniques. In addition, it is proved that the lower bound sequence converges. Several numerical experiments are given to demonstrate that the lower bound sequence is sharper than some existing ones in most cases.
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2021.0092-21
       
  • The extremal irregularity of connected graphs with given number of pendant
           vertices

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      Abstract: Abstract The irregularity of a graph G = (V, E) is defined as the sum of imbalances ∣du − dv∣ over all edges uv ∈ E, where du denotes the degree of the vertex u in G. This graph invariant, introduced by Albertson in 1997, is a measure of the defect of regularity of a graph. In this paper, we completely determine the extremal values of the irregularity of connected graphs with n vertices and p pendant vertices (1 ⩽ p ⩽ n − 1), and characterize the corresponding extremal graphs.
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2022.0125-21
       
  • Complex symmetry of Toeplitz operators on the weighted Bergman spaces

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      Abstract: Abstract We give a concrete description of complex symmetric monomial Toeplitz operators \({T_{{z^p}{{\bar z}^q}}}\) on the weighted Bergman space A2(Ω), where Ω denotes the unit ball or the unit polydisk. We provide a necessary condition for \({T_{{z^p}{{\bar z}^q}}}\) to be complex symmetric. When p,q ∈ ℕ2, we prove that \({T_{{z^p}{{\bar z}^q}}}\) is complex symmetric on A2(Ω) if and only if p1 = q2 and P2 = q1. Moreover, we completely characterize when monomial Toeplitz operators \({T_{{z^p}{{\bar z}^q}}}\) on \({A^2}\left( {{\mathbb{D}_n}} \right)\) are JU-symmetric with the n × n symmetric unitary matrix U.
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2022.0210-21
       
  • Weighted Multi-Parameter Mixed Hardy Spaces and Their Applications

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      Abstract: Abstract Applying discrete Calderón’s identity, we study weighted multi-parameter mixed Hardy space \(H_{{\rm{mix}}}^p(\omega ,{\mathbb{R}^{{n_1}}} \times {\mathbb{R}^{{n_2}}})\) . Different from classical multi-parameter Hardy space, this space has characteristics of local Hardy space and Hardy space in different directions, respectively. As applications, we discuss the boundedness on \(H_{{\rm{mix}}}^p(\omega ,{\mathbb{R}^{{n_1}}} \times {\mathbb{R}^{{n_2}}})\) of operators in mixed Journé’s class.
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2022.0115-21
       
  • Weak n-injective and weak n-fat modules

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      Abstract: Abstract We introduce and study the concepts of weak n-injective and weak n-flat modules in terms of super finitely presented modules whose projective dimension is at most n, which generalize the n-FP-injective and n-flat modules. We show that the class of all weak n-injective R-modules is injectively resolving, whereas that of weak n-flat right R-modules is projectively resolving and the class of weak n-injective (or weak n-flat) modules together with its left (or right) orthogonal class forms a hereditary (or perfect hereditary) cotorsion theory.
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2022.0225-21
       
  • Remarks on Sekine Quantum Groups

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      Abstract: Abstract We first describe the Sekine quantum groups \({{\cal A}_k}\) (the finite-dimensional Kac algebra of Kac-Paljutkin type) by generators and relations explicitly, which maybe convenient for further study. Then we classify all irreducible representations of \({{\cal A}_k}\) and describe their representation rings \(r({{\cal A}_k})\) . Finally, we compute the the Frobenius-Perron dimension of the Casimir element and the Casimir number of \(r({{\cal A}_k})\) .
      PubDate: 2022-10-01
      DOI: 10.21136/CMJ.2022.0112-21
       
  • Maximum bipartite subgraphs in H-free graphs

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      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
      DOI: 10.21136/CMJ.2022.0302-20
       
 
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