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: 39)
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: 19)
Advances in Mathematical Physics     Open Access   (Followers: 5)
Advances in Mathematics     Full-text available via subscription   (Followers: 19)
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: 8)
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: 4)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 16)
Annals of PDE     Hybrid Journal  
Annals of Pure and Applied Logic     Open Access   (Followers: 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: 2)
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: 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: 1)
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 17)
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: 1)
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

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Bulletin of the Iranian Mathematical Society
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1017-060X - ISSN (Online) 1735-8515
Published by Springer-Verlag Homepage  [2469 journals]
  • Algorithms for Construction of Recurrence Relations for the Coefficients
           of the Fourier Series Expansions with Respect to Classical Discrete
           Orthogonal Polynomials

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      Abstract: Abstract A new formula expressing explicitly the integrals, antidifference, of discrete orthogonal polynomials \(\{P_{n}(x):\) Hahn, Meixner, Kravchuk, and Charlier \(\}\) of any degree in terms of \(P_{n}(x)\) themselves are proved. Other formulae for the expansion coefficients of general-order difference integrations \(\nabla ^{-s}f(x),\,\Delta ^{-s}f(x),\) \(\nabla ^{-s}[x^{\ell }\nabla ^{q}f(x)]\,\) and \(\Delta ^{-s}[x^{\ell }\Delta ^{q}f(x)],\) of an arbitrary function f(x) of a discrete variable in terms of its original expansion coefficients are also obtained. Application of these formulae for solving ordinary difference equations with varying coefficients, by reducing them to recurrence relations in the expansion coefficients of the solution, is explained.
      PubDate: 2022-06-01
       
  • Some New Families of 3-Regular Self-complementary k-Hypergraphs

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      Abstract: Abstract A k-hypergraph with vertex set V and edge set E is called t-regular if every t-element subset of V lies in the same number of elements of E. In this note, we give the necessary and sufficient conditions for the existence of some new families of 3-regular self-complementary k-hypergraphs for \(k=4, 5, 6, 7\) .
      PubDate: 2022-06-01
       
  • On Connected 3- $$\gamma _{L}$$ γ L -Dot-Critical Graphs

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      Abstract: Abstract A set D of vertices in a graph G is a locating-dominating set if for every two vertices u, v of \(V-D\) the sets \(N_{G}(u)\cap D\) and \(N_{G}(v)\cap D\) are non-empty and different. The locating-domination number \(\gamma _{L}(G)\) is the minimum cardinality of a locating-dominating set of G. A graph G is \(\gamma _{L}\) -dot-critical if contracting any edge of G decreases its locating-domination number. Let \(k\ge 3\) be an integer. A graph G is called k- \(\gamma _{L}\) -dot-critical if G is \(\gamma _{L}\) -dot-critical with \(\gamma _{L}\left( G\right) =k.\) In this paper, we characterize all connected 3- \(\gamma _{L}\) -dot-critical graphs.
      PubDate: 2022-06-01
       
  • Algebraic Properties of Edge Ideals and Cover Ideals of Unbalanced Crown
           Graphs

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      Abstract: Abstract In this paper, we introduce the unbalanced crown graphs \({\mathcal {C}}_{m,n}\) , and compute all graded Betti numbers of edge ideals of these graphs in terms of associated numerical data. As a consequence, we determine the regularity and the projective dimension of edge ideals of these graphs. Also, the Hilbert series of the cover ideals of these graphs is obtained.
      PubDate: 2022-06-01
       
  • Further Progress on the Total Roman $$\{2\}$$ { 2 } -Domination Number of
           Graphs

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      Abstract: Abstract For a graph \(\Gamma \) , let \(\gamma (\Gamma ),\) \(\gamma _{t}(\Gamma )\) , and \(\gamma _{tR2}(\Gamma )\) denote the domination number, the total domination number, and the total Roman \(\{2\}\) -domination number, respectively. It was shown in Abdollahzadeh Ahangar et al. (Discuss Math Graph Theory, in press) that for each nontrivial connected graph \(\Gamma ,\) \(\gamma _{t}(\Gamma )\le \gamma _{tR2}(\Gamma )\le 3\gamma (\Gamma ).\) The problem that arises naturally is to characterize the graphs attaining each bound. For the left inequality, we establish a necessary and sufficient condition for nontrivial connected graphs \(\Gamma \) with \(\gamma _{tR2} (\Gamma )=\gamma _{t}(\Gamma ),\) and we characterize those graphs that are \(\{C_{3},C_{6}\}\) -free or block. For the right inequality, we present a necessary condition for nontrivial connected graphs \(\Gamma \) with \(\gamma _{tR2}(\Gamma )=3\gamma (\Gamma ),\) and we characterize those graphs that are diameter-2 or trees.
      PubDate: 2022-06-01
       
  • Lower Bound Estimation of the Minimum Eigenvalue of Hadamard Product of an
           M-Matrix and its Inverse

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      Abstract: Abstract In this paper, we propose a lower bound sequence for \(\tau \left( A \circ {A^{ - 1}}\right) \) , the minimum eigenvalue of Hadamard product of an M-matrix and its inverse by constructing a vector x and a constant k such that \(A \circ {A^{ - 1}}x\ge kx\) . We prove the convergence of the lower bound sequence, which is an improvement on some of the existing results. By introducing a parameter and modifying constantly x and k, a more precise lower bound sequence is obtained. An example is given to show that the truth value of the minimum eigenvalue can be obtained by applying the new theorem to some kind of cyclic matrix. And several numerical experiments are given to demonstrate that the new bounds are sharper than some existing ones in most cases.
      PubDate: 2022-06-01
       
  • Curvatures of Spherically Symmetric Metrics on Vector Bundles

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      Abstract: Abstract This paper is devoted to study the geometry of vector bundle manifolds equipped with spherically symmetric metrics. We will compute the curvature tensor, the sectional curvature, the Ricci curvature tensor and the scalar curvature. We will then characterize spherically symmetric metrics of constant sectional curvature. Moreover, we will establish some rigidity results regarding the scalar curvature and the Ricci curvature. Finally, we investigate geodesics using the fundamental tensors of a submersion.
      PubDate: 2022-06-01
       
  • A Variant of d’Alembert Functional Equation on Monoids

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      Abstract: Abstract In this paper, we determine the complex-valued solutions of the functional equation $$\begin{aligned} f(x\sigma (y))+f(\tau (y)x)=2f(x)f(y) \end{aligned}$$ for all \(x,y \in M\) , where M is a monoid, \(\sigma \) : \(M\longrightarrow M\) is an involutive automorphism and \(\tau \) : \(M\longrightarrow M\) is an involutive anti-automorphism. The solutions are expressed in terms of multiplicative functions, and characters of 2-dimensional irreducible representations of M.
      PubDate: 2022-06-01
       
  • Double Roman Domination in Generalized Petersen Graphs

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      Abstract: Abstract The double Roman domination can be described as a strengthened defense strategy. In an empire, each city can be protected by at most three troops. Every city having no troops must be adjacent to at least two cities with two troops or one city with three troops. Every city having one troop must be adjacent to at least one city with more than one troop. Such an assignment is called a double Roman dominating function (DRDF) of an empire/a graph. The minimum number of troops under such an assignment is the double Roman domination number, denoted as \(\gamma _{dR}\) . Shao et al. (2018) determine the exact value of \(\gamma _{dR}(P(n,1))\) . Jiang et al. (2018) determine \(\gamma _{dR}(P(n,2))\) . In this article, we investigate the double Roman domination number of P(n, k) for \(k\ge 3\) . We determine the exact value of \(\gamma _{dR}(P(n,k))\) for \(n\equiv 0(\bmod 4)\) and \(k\equiv 1(\bmod 2)\) , and present an improved upper bound of \(\gamma _{dR}(P(n,k))\) for \(n\not \equiv 0(\bmod 4)\) or \(k\not \equiv 1(\bmod 2)\) . Our results imply P(n, 3) for \(n\equiv 0(\bmod 4)\) is double Roman which can partially answer the open question present by Beeler et al. (2016).
      PubDate: 2022-06-01
       
  • Finite Groups with Nilpotent Subgroups of Even Order

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      Abstract: Abstract A group G is called to be EMN-group (rep. ESMN-group) if all maximal subgroup (rep. second maximal subgroup) of G of even order are nilpotent. In this paper, we mainly investigate the structure of EMN-groups and ESMN-groups.
      PubDate: 2022-06-01
       
  • Analysis of a Batch Arrival Retrial Queue with Two-Phase Services,
           Feedback and Admission

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      Abstract: Abstract Today, real-world problems modeling is the first step in controlling, analyzing, and optimizing them. One of the applied techniques for modeling some of these problems is the queueing theory. Usually, the conditions such as lack of space, feedback, admission limits, etc. are the inseparable parts of these problems. This paper deals with modeling and analyzing the steady-state behavior of an \(M^{X} /G/ 1\) retrial queueing system with two phases of heterogeneous services and general retrial time. The arriving batches join the system with dependent admission due to the server state. If the customers find the server busy, they join the orbit to repeat their request. Although, the first phase of service is essential for all customers, any customer has three options after the completion of the \(i\) -th phase \(\left( {i = 1,2} \right)\) . They may take the \(\left( {i + 1} \right)\) -th phase of service with probability \({\uptheta }_{{\text{i}}}\) , otherwise, return the orbit with probability \(p_{i} \left( {1 - \theta_{i} } \right)\) or leave the system with probability \({ }\left( {1 - p_{i} } \right)\left( {1 - \theta_{i} } \right)\) . In this paper, after finding the steady-state distributions and the probability generating functions of the system and orbit size, some important performance measures are found. Then, the sensitivity analysis of performance measures and cost rate is done concerning arrival/retrial rates, feedback probabilities, and state-dependent admission in a telecommunication system.
      PubDate: 2022-06-01
       
  • On the Exceptional Solutions of Jeśmanowicz’ Conjecture

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      Abstract: Abstract Let (a, b, c) be a primitive Pythagorean triple. Set \(a = m^2-n^2 \) , \(b=2mn\) , and \(c=m^2+n^2\) with m and n positive coprime integers, \( m>n \) and \(m \not \equiv n \pmod 2 \) . A famous conjecture of Jeśmanowicz asserts that the only positive integer solution to the Diophantine equation \(a^x+b^y=c^z\) is \((x,y,z)=(2,2,2).\) A solution \((x,y,z) \ne (2,2,2)\) of this equation is called an exceptional solution. In this note, we will prove that for any \( n>0 \) there exists an explicit constant c(n) such that if \( m> c(n) \) , the above equation has no exceptional solution when all x,y and z are even. Our result improves that of Fu and Yang (Period Math Hung 81(2):275–283, 2020). As an application, we will show that if \(4 \mid \!\mid m\) and \(m > c(n) \) , then Jeśmanowicz’ conjecture holds.
      PubDate: 2022-06-01
       
  • Existence of Positive Solutions to Weighted Linear Elliptic Equations
           Under Double Exponential Nonlinearity Growth

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      Abstract: Abstract In this article, a weighted problem under boundary Dirichlet condition in the unit ball of \({\mathbb {R}}^{2}\) is considered. The non-linearity of the equation is assumed to have double exponential growth in view of Trudinger–Moser type inequalities. It is proved that there is a nontrivial positive weak solution to this equation. In the critical case, the compactness condition is not satisfied but a suitable asymptotic condition is used to avoid the non-compactness levels to the energy functional.
      PubDate: 2022-06-01
       
  • On Lie Groups with Recurrent Curvature in Dimension Four

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      Abstract: Abstract In this paper, we give a full classification of pseudo-Riemannian Lie groups of dimension four with non-trivial recurrent curvature tensor (i.e., non-locally symmetric). Then we investigate Ricci solitons on recurrent curvature Lie groups. Locally conformally flat examples of our classification have also been presented.
      PubDate: 2022-06-01
       
  • A Simple Form of Noether Normalization

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      Abstract: Abstract In this note we give a simple version (with a simple proof) of Noether’s Normalization Lemma which implies Zariski’s Lemma and Hilbert’s Nullstellensatz (weak form) more naturally.
      PubDate: 2022-06-01
       
  • Prime z-Ideal Rings (pz-Rings)

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      Abstract: Abstract A ring R is said to be a pz-ring (resp., psz-ring) whenever every prime ideal of R is a z-ideal (resp., sz-ideal). In this article, we introduce and investigate these concepts. We show that X is a P-space if and only if C(X) is a pz-ring; if and only if \(\frac{C(X)}{I}\) is a pz-ring for every nonzero ideal I of C(X). Also, we show that if X is a compact space and I is an ideal of C(X), then the quotient ring \(\frac{C(X)}{I}\) is a pz-ring if and only if I is a finite intersection of maximal ideals. We prove that R[[x]] is never a pz-ring. Also, we introduce a new class of ideals in \(\prod _{\lambda \in \Lambda }R_\lambda \) denoted by \({\mathcal {I}}({\mathcal {F}},\{I_\lambda \})\) , where \({\mathcal {F}}\) is a filter on \(\Lambda \) and then we show that \(R_\lambda \) is a pz-ring for every \(\lambda \in \Lambda \) if and only if every semiprime ideal of the form \({\mathcal {I}}({\mathcal {F}},\{I_\lambda \})\) is a z-ideal, where \(\mathcal F\) is an ultrafilter. Moreover, in addition to the main statements of the article, it is proved that an ideal I of R is an sz-ideal if and only if (I, x) is an sz-ideal in R[x]. Also, we show that I is a semiprime ideal in R if and only if I[x] is an sz-ideal in R[x]; if and only I[x] is a z-ideal in R[x]. Using this fact, we present a class of simple examples that shows the sum of two z-ideals is not a z-ideal, in general.
      PubDate: 2022-06-01
       
  • Hermitian-Toeplitz Determinants for Certain Classes of Close-to-Convex
           Functions

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      Abstract: Abstract The class of close-to-convex functions are univalent and so its subclasses. For normalised analytic functions defined on the unit disk, four subclasses of close-to-convex functions are considered and Hermitian-Toeplitz determinants for these classes are investigated. All the results presented in this article are sharp.
      PubDate: 2022-06-01
       
  • On Generalised Reverse Derivations in Semirings

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      Abstract: Abstract In this article, we introduce generalized reverse derivations in semirings and present conditions that lead to the commutativity of additively inverse semirings.
      PubDate: 2022-06-01
       
  • Capability of Nilpotent Lie Algebras of Small Dimension

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      Abstract: Abstract Given a nilpotent Lie algebra L of dimension \(\le 6\) on an arbitrary field of characteristic \(\ne 2\) , we show a direct method to detect whether L is capable or not via computations on the size of its nonabelian exterior square \(L \wedge L\) . For dimensions higher than 6, we show a result of general nature, based on the evidences of the low dimensional case, but also on the evidences of large families of nilpotent Lie algebras, namely the generalized Heisenberg algebras. Indeed, we detect the capability of \(L \wedge L\) via the size of the Schur multiplier \(M(L/Z^\wedge (L))\) of \(L/Z^\wedge (L)\) , where \(Z^\wedge (L)\) denotes the exterior center of L.
      PubDate: 2022-06-01
       
  • The Recollements of Abelian Categories: Cotorsion Dimensions and Cotorsion
           Triples

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      Abstract: Abstract In this paper, we study the cotorsion dimensions and cotorsion triples in the recollements of abelian categories. The main results are that recollements induce new (resp. complete hereditary) cotorsion triples from the middle category and that the cotorsion dimensions are bounded under certain conditions. As an application, the cotorsion triples in the recollements of module categories with respect to triangular matrix algebras are recovered.
      PubDate: 2022-06-01
       
 
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