Subjects -> MATHEMATICS (Total: 1118 journals)
    - APPLIED MATHEMATICS (92 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (819 journals)
    - MATHEMATICS (GENERAL) (45 journals)
    - NUMERICAL ANALYSIS (26 journals)
    - PROBABILITIES AND MATH STATISTICS (113 journals)

MATHEMATICS (819 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: 3)
Accounting Perspectives     Full-text available via subscription   (Followers: 9)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 17)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 5)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 9)
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 44)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 2)
Acta Mathematica     Hybrid Journal   (Followers: 11)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 13)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 8)
Advances in Complex Systems     Hybrid Journal   (Followers: 12)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 23)
Advances in Decision Sciences     Open Access   (Followers: 4)
Advances in Difference Equations     Open Access   (Followers: 5)
Advances in Fixed Point Theory     Open Access   (Followers: 9)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 22)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 10)
Advances in Materials Science     Open Access   (Followers: 22)
Advances in Mathematical Physics     Open Access   (Followers: 10)
Advances in Mathematics     Full-text available via subscription   (Followers: 22)
Advances in Numerical Analysis     Open Access   (Followers: 8)
Advances in Operations Research     Open Access   (Followers: 14)
Advances in Operator Theory     Hybrid Journal   (Followers: 4)
Advances in Porous Media     Full-text available via subscription   (Followers: 6)
Advances in Pure Mathematics     Open Access   (Followers: 11)
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: 12)
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: 4)
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: 8)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Open Access   (Followers: 5)
Algorithms     Open Access   (Followers: 14)
Algorithms Research     Open Access   (Followers: 2)
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: 9)
American Journal of Operations Research     Open Access   (Followers: 8)
American Mathematical Monthly     Full-text available via subscription   (Followers: 7)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 13)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access  
Analysis and Applications     Hybrid Journal   (Followers: 2)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 10)
Analysis Mathematica     Full-text available via subscription  
Anargya : Jurnal Ilmiah Pendidikan Matematika     Open Access   (Followers: 8)
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: 3)
Annals of Data Science     Hybrid Journal   (Followers: 17)
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: 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: 6)
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   (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: 2)
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: 16)
Applied Mathematics     Open Access   (Followers: 10)
Applied Mathematics     Open Access   (Followers: 6)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 13)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal   (Followers: 2)
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: 2)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 6)
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: 4)
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  
Asian-European Journal of Mathematics     Hybrid Journal   (Followers: 4)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 7)
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: 1)
Basin Research     Hybrid Journal   (Followers: 6)
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: 3)
British Journal for the History of Mathematics     Hybrid Journal  
British Journal of Mathematical and Statistical Psychology     Full-text available via subscription   (Followers: 20)
Bruno Pini Mathematical Analysis Seminar     Open Access  
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 14)
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: 3)
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   (Followers: 2)
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: 23)
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: 6)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
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: 3)
Chinese Journal of Mathematics     Open Access  
Ciencia     Open Access   (Followers: 1)
CODEE Journal     Open Access   (Followers: 2)
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: 17)
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: 5)
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: 11)
Compositio Mathematica     Full-text available via subscription  
Comptes Rendus : Mathematique     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 4)
Computational and Mathematical Methods     Hybrid Journal  
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 3)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 1)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 9)
Computational Mechanics     Hybrid Journal   (Followers: 10)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 11)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 11)
Confluentes Mathematici     Hybrid Journal  
Constructive Mathematical Analysis     Open Access   (Followers: 1)
Contributions to Discrete Mathematics     Open Access   (Followers: 1)
Contributions to Game Theory and Management     Open Access  
COSMOS     Hybrid Journal   (Followers: 1)
Cryptography and Communications     Hybrid Journal   (Followers: 14)
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: 1)
Demographic Research     Open Access   (Followers: 16)
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 35)
Desimal : Jurnal Matematika     Open Access   (Followers: 3)
Developments in Clay Science     Full-text available via subscription   (Followers: 1)
Developments in Mineral Processing     Full-text available via subscription   (Followers: 3)
Dhaka University Journal of Science     Open Access  
Differential Equations and Dynamical Systems     Hybrid Journal   (Followers: 4)

        1 2 3 4 5 | Last

Similar Journals
Journal Cover
Acta Mathematica Hungarica
Journal Prestige (SJR): 0.452
Citation Impact (citeScore): 1
Number of Followers: 2  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1588-2632 - ISSN (Online) 0236-5294
Published by Springer-Verlag Homepage  [2658 journals]
  • Constructing finite sets from their representation functions

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      Abstract: For any positive integer m, let \(\mathbb{Z}_{m}\) be the set of residue classes modulo m. For \(A\subseteq \mathbb{Z}_{m}\) and \(\overline{n}\in \mathbb{Z}_{m}\) , let the representation function \(R_{A}(\overline{n})\) denote the number of solutions of the equation \(\overline{n}=\overline{a}+\overline{a'}\) with unordered pairs \((\overline{a}, \overline{a'})\in A \times A\) . We characterize the partitions of \(\mathbb{Z}_{2p}\) with \(A\cup B=\mathbb{Z}_{2p}\) and \( A\cap B =2\) such that \(R_{A}(\overline{n})=R_{B}(\overline{n})\) for all \(\overline{n}\in\mathbb{Z}_{2p}\) , where p is an odd prime.
      PubDate: 2021-10-01
       
  • The Iwasawa invariant $$\mu$$ μ vanishes for $$\mathbb{Z}_{2}$$ Z 2
           -extensions of certain real biquadratic fields

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      Abstract: For a real biquadratic field, we denote by \(\lambda\) , \(\mu\) and \(\nu\) the Iwasawa invariants of cyclotomic \(\mathbb{Z}_{2}\) -extension of \(k\) . We give certain families of real biquadratic fields \(k\) such that \(\mu=0\) .
      PubDate: 2021-10-01
       
  • Dimension prints for continuous functions on the unit square

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      Abstract: Recently, we have proved that the rectangular pointwise Lipschitz regularity of a continuous function on the unit square is directly related with the local suprema of the coefficients of the function in the tensor product Faber–Schauder basis. In this paper, we provide print dimension information on the distribution at all bi-scales of these local suprema. We apply our results for self-affine functions associated to the Schauder product function and a particular type of Sierpinski carpets.
      PubDate: 2021-10-01
       
  • Cancellable elements of the lattice of monoid varieties

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      Abstract: The set of all cancellable elements of the lattice of semigroup varieties has recently been shown to be countably infinite. But the description of all cancellable elements of the lattice \(\mathbb{MON}\) of monoid varieties remains unknown. This problem is addressed in the present article. The first example of a monoid variety with modular but non-distributive subvariety lattice is first exhibited. Then a necessary condition of the modularity of an element in \(\mathbb{MON}\) is established. These results play a crucial role in the complete description of all cancellable elements of the lattice \(\mathbb{MON}\) . It turns out that there are precisely five such elements.
      PubDate: 2021-10-01
       
  • On dualization of a result of Bryce and Cossey theory

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      Abstract: Let \(\sigma\) be a partition of the set of all primes \(\mathbb{P}\) . Let G be a finite group and \(\mathfrak{F}\) be a Fitting class of finite groups. In the theory of formations of finite soluble groups, a well known result of Bryce and Cossey is: a local formation \(\mathfrak{F}\) is a Fitting class if and only if every value of the canonical formation function F of \(\mathfrak{F}\) is a Fitting class. In this paper, we give the dual theory of the result of Bryce and Cossey. We proved that an \(\sigma\) -local Fitting class \(\mathfrak{F}\) is a formation if and only if every value of the canonical \(\sigma\) -local \(H_{\sigma}\) -function of \(\mathfrak{F}\) is a formation.
      PubDate: 2021-10-01
       
  • On a class of functional equations which includes the Pexider's one

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      Abstract: We find the solutions \(f,g,h \colon S \to H\) of the following extension of Pexider's functional equation $$\underset{\lambda\in K}{\sum}f(x+\lambda y)=g(x)+h(y),\quad x,y\in S,$$ where (S,+) is an abelian semigroup, K is a finite subgroup of the automorphism group of S and (H,+) is an abelian group.
      PubDate: 2021-10-01
       
  • More on Weak Diamond

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      Abstract: We deal with the combinatorial principle Weak Diamond. We prove that, if it holds for a given cardinal, we can get this principle with more than two colours or some relevant ideal is not too saturated. Then we point out a model theoretic consequence of Weak Diamond.
      PubDate: 2021-10-01
       
  • Prime-representing functions and Hausdorff dimension

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      Abstract: Let \(c \geq 2\) be any fixed real number. Matomäki [4] inverstigated the set of \(A > 1\) such that the integer part of \( A^{c^k}\) is a prime number for every \(k \in \mathbb{N}\) . She proved that the set is uncountable, nowhere dense, and has Lebesgue measure 0. In this article, we show that the set has Hausdorff dimension 1.
      PubDate: 2021-10-01
       
  • Non-crossing monotone paths and binary trees in edge-ordered complete
           geometric graphs

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      Abstract: An edge-ordered graph is a graph with a total ordering of its edges. A path \(P=v_1v_2\ldots v_k\) in an edge-ordered graph is called increasing if \((v_iv_{i+1}) < (v_{i+1}v_{i+2})\) for all \(i = 1,\ldots,k-2\) ; and it is called decreasing if \((v_iv_{i+1}) > (v_{i+1}v_{i+2})\) for all \(i = 1,\ldots,k-2\) . We say that P is monotone if it is increasing or decreasing. A rooted tree T in an edge-ordered graph is called monotone if either every path from the root to a leaf is increasing or every path from the root to a leaf is decreasing. Let G be a graph. In a straight-line drawing D of G, its vertices are drawn as different points in the plane and its edges are straight line segments. Let \(\overline{\alpha}(G)\) be the largest integer such that every edge-ordered straight-line drawing of G contains a monotone non-crossing path of length \(\overline{\alpha}(G)\) . Let \(\overline{\tau}(G)\) be the largest integer such that every edge-ordered straight-line drawing of G contains a monotone non-crossing complete binary tree of \(\overline{\tau}(G)\) edges. In this paper we show that \(\overline \alpha(K_n) = \Omega(\log\log n)\) , \(\overline \alpha(K_n) = O(\log n), \overline \tau(K_n) = \Omega(\log\log \log n)\) and \(\overline \tau(K_n) = O(\sqrt{n \log n})\) .
      PubDate: 2021-10-01
       
  • Weighted bounds for the composition of singular integral operators with
           nonsmooth kernels on spaces of homogeneous type

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      Abstract: Let \((X, d, \mu)\) be a space of homogeneous type. Let \(T_{1}, T_{2}\) be singular integral operators with nonsmooth kernels. By establishing sparse domination, we obtain quantitative boundedness for the composite operator \(T_{1}T_{2}\) on \(L^{p}(X, \omega)\) with \(\omega\in A_{p}\) and the weighted endpoint estimate for the composite operator \(T_{1}T_{2}\) .
      PubDate: 2021-10-01
       
  • On m- $$\sigma$$ σ -embedded subgroups of finite groups

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      Abstract: Let \(\sigma =\{\sigma_i i\in I\}\) be some partition of the set of all primes \(\mathbb{P}\) and G be a finite group. A group is said to be \(\sigma\) -primary if it is a finite \(\sigma_{i}\) -group for some i. A subgroup A of G is said to be \({\sigma}\) -subnormal in G if there is a subgroup chain \(A=A_{0} \leq A_{1} \leq \cdots \leq A_{t}=G\) such that either \(A_{i-1}\trianglelefteq A_{i}\) or \(A_{i}/(A_{i-1})_{A_{i}}\) is \(\sigma\) -primary for all \(i=1, \ldots , t\) . A subgroup S of G is m- \(\sigma\) -permutable in G if \(S=\langle M, B \rangle\) for some modular subgroup M and \(\sigma\) -permutable subgroup B of G. We say that a subgroup H of G is m- \(\sigma\) -embedded in G if there exist an m- \(\sigma\) -permutable subgroup S and a \(\sigma\) -subnormal subgroup T of G such that \(H^G=HT\) and \(H\cap T\leq S\leq H\) , where \(H^G = \langle H^x x \in G \rangle\) is the normal closure of H in G. In this paper, we study the properties of m- \(\sigma\) -embedded subgroups and use them to determine the structure of finite groups. Some known results are generalized.
      PubDate: 2021-10-01
       
  • Rényi 100, Quantitative and qualitative (in)dependence

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      Abstract: We discuss recent developments in the following important areas of Alfréd Rényi’s research interest: axiomatization of quantitative dependence measures, qualitative independence in combinatorics, conditional qualitative independence in statistics/data science and in measure theory/probability theory, and finally, prime gaps that are responsible for Rényi’s early career reputation. Most authors of this paper are main contributors to the new developments.
      PubDate: 2021-10-01
       
  • Reverse induction proof of D property of the countable power of the
           Sorgenfrey line

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      Abstract: Answering a question of E. K. van Douwen and W. F. Pfeffer [1], we prove that the countable power of the Sorgenfrey line is a D-space. To establish this result we use a method of proof which we call reverse induction. This method allows to establish certain properties of a product \(\prod_{{i}=0}^{\infty}{X}_{i}\) by making a kind of ``reverse induction step'' from \(\prod_{{i}={n}+1}^{\infty}{X}_{i} {\rm to} \prod_{{i}={n}}^{\infty}{X}_{i}\) for an arbitrary natural n.
      PubDate: 2021-10-01
       
  • Colouring of successor of regular, again

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      Abstract: We get a version of the colouring property Pr1 proving \(\Pr_1(\lambda,\lambda,\lambda,\partial)\) always when \(\lambda= \partial^+,\partial \) are regular cardinals and some stationary subset of \(\lambda\) consisting of ordinals of cofinality \(< \partial\) do not reflect in any ordinal \(< \lambda\) .
      PubDate: 2021-10-01
       
  • Classification of nonsemicommutative rings

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      Abstract: The classes of semicommutative, PS I, 2-primal, weakly-2-primal, NI, NR and Dedekind-finite rings form a strictly increasing chain of classes of rings. Examples have been provided by several authors to show most of the inclusions are strict. In this paper it is shown that every inclusion is strict. Furthermore, in most instances examples with the additional properties of being reflexive and/or abelian are constructed. In particular, an abelian nonreflexive NI non-weakly-2-primal ring is given, which shows that the classes of NI and weakly-2-primal rings differ; a fact that has been previously claimed without proof.
      PubDate: 2021-10-01
       
  • Morley’s trisector Theorem for isosceles tetrahedron

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      Abstract: We extend Morley’s trisector theorem in the plane to an isosceles tetrahedron in three-dimensional space. We will show that the Morley tetrahedron of an isosceles tetrahedron is also isosceles tetrahedron. Furthermore, by the formula for distance in barycentric coordinate, we introduce and prove a general theorem on an isosceles tetrahedron.
      PubDate: 2021-09-03
       
  • $$L^p$$ L p maximal estimates for quadratic Weyl sums

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      Abstract: Let \(p \ge 1\) . We give upper and lower bounds for $$\begin{aligned} {M}_{p}(N): = \bigg \Vert \mathop {\mathrm{sup}}\limits _{0 \le t \le 1} \bigg {\sum _{n=1}^N} {e}(nx + n^{2}t)\bigg \bigg \Vert _{L^{p}[0,1]}^{p} \end{aligned}$$ that are of the same order of magnitude.
      PubDate: 2021-09-03
       
  • On p-nilpotence and $$IC{\Phi}$$ I C Φ -subgroups of finite groups

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      Abstract: A subgroup H of a group G is said to be an \(IC\mathrm{\Phi}\) -subgroup of G if \(H \cap [H,G] \le \mathrm{\Phi}(H)\) . We prove the p-nilpotency of a finite group G under the assumption that certain p-subgroups of G are \(IC\mathrm{\Phi}\) -subgroups of G. Our main result generalizes and extends some recent work of Gao and Li [1].
      PubDate: 2021-09-03
       
  • Heron triangles with polynomial value sides

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      Abstract: Using the method of undetermined coefficients and the theory of Pellian equation, we show that there exist infinitely many isosceles Heron triangles whose sides are certain polynomial values.
      PubDate: 2021-09-03
       
  • The cosine and sine addition and subtraction formulas on semigroups

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      Abstract: The cosine addition formula on a semigroup S is the functional equation \(g(xy) = g(x)g(y) - f(x)f(y)\) for all \(x,y \in S\) . We find its general solution for \(g,f \colon S \to \mathbb{C}\) , using the recently found general solution of the sine addition formula \(f(xy) = f(x)g(y) + g(x)f(y)\) on semigroups. A simpler proof of this latter result is also included, with some details added to the solution. We also solve the cosine subtraction formula \(g(x\sigma(y)) = g(x)g(y) + f(x)f(y)\) on monoids, where \(\sigma\) is an automorphic involution. The solutions of these functional equations are described mostly in terms of additive and multiplicative functions, but for some semigroups there exist points where f and/or g can take arbitrary values. The continuous solutions on topological semigroups are also found.
      PubDate: 2021-09-03
       
 
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