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  Subjects -> MATHEMATICS (Total: 885 journals)
    - APPLIED MATHEMATICS (71 journals)
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    - MATHEMATICS (656 journals)
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MATHEMATICS (656 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: 3)
Academic Voices : A Multidisciplinary Journal     Open Access   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 8)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 16)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 4)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 6)
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 21)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1)
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: 5)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 7)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15)
Advances in Decision Sciences     Open Access   (Followers: 5)
Advances in Difference Equations     Open Access   (Followers: 1)
Advances in Fixed Point Theory     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 2)
Advances in Materials Sciences     Open Access   (Followers: 16)
Advances in Mathematical Physics     Open Access   (Followers: 5)
Advances in Mathematics     Full-text available via subscription   (Followers: 10)
Advances in Numerical Analysis     Open Access   (Followers: 4)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Pure and Applied Mathematics     Hybrid Journal   (Followers: 6)
Advances in Pure Mathematics     Open Access   (Followers: 4)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 5)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
Afrika Matematika     Hybrid Journal   (Followers: 1)
Air, Soil & Water Research     Open Access   (Followers: 7)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 1)
Al-Jabar : Jurnal Pendidikan Matematika     Open Access  
Algebra and Logic     Hybrid Journal   (Followers: 4)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Full-text available via subscription   (Followers: 5)
Algorithms     Open Access   (Followers: 11)
Algorithms Research     Open Access   (Followers: 1)
American Journal of Biostatistics     Open Access   (Followers: 9)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 4)
American Journal of Mathematical Analysis     Open Access  
American Journal of Mathematics     Full-text available via subscription   (Followers: 7)
American Journal of Operations Research     Open Access   (Followers: 5)
American Mathematical Monthly     Full-text available via subscription   (Followers: 6)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 7)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access   (Followers: 1)
Analysis     Hybrid Journal   (Followers: 2)
Analysis and Applications     Hybrid Journal   (Followers: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 3)
Analysis Mathematica     Full-text available via subscription  
Annales Mathematicae Silesianae     Open Access  
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annales UMCS, 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: 9)
Annals of Discrete Mathematics     Full-text available via subscription   (Followers: 6)
Annals of Mathematics     Full-text available via subscription  
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 6)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
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  
Annuaire du Collège de France     Open Access   (Followers: 5)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applications of Mathematics     Hybrid Journal   (Followers: 1)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Mathematics     Open Access   (Followers: 3)
Applied Mathematics     Open Access   (Followers: 4)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 4)
Applied Mathematics - A Journal of Chinese Universities     Hybrid Journal  
Applied Mathematics Letters     Full-text available via subscription   (Followers: 1)
Applied Mathematics Research eXpress     Hybrid Journal   (Followers: 1)
Applied Network Science     Open Access  
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 3)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites : The Journal of Space Research Centre of Polish Academy of Sciences     Open Access   (Followers: 19)
Asia-Pacific Journal of Operational Research     Hybrid Journal   (Followers: 3)
Asian Journal of Algebra     Open Access   (Followers: 1)
Asian Journal of Current Engineering & Maths     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: 2)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 1)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Axioms     Open Access  
Baltic International Yearbook of Cognition, Logic and Communication     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
BIBECHANA     Open Access  
BIT Numerical Mathematics     Hybrid Journal  
BoEM - Boletim online de Educação Matemática     Open Access  
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: 1)
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: 7)
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: 1)
Bulletin of Mathematical Sciences     Open Access   (Followers: 1)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 3)
Bulletin of the Malaysian Mathematical Sciences Society     Hybrid Journal  
Calculus of Variations and Partial Differential Equations     Hybrid Journal  
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 18)
Carpathian Mathematical Publications     Open Access   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal  
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
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  
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Full-text available via subscription   (Followers: 3)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Commentarii Mathematici Helvetici     Hybrid Journal   (Followers: 1)
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 1)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 3)
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Complexus     Full-text available via subscription  
Composite Materials Series     Full-text available via subscription   (Followers: 9)
Comptes Rendus Mathematique     Full-text available via subscription   (Followers: 1)
Computational and Applied Mathematics     Hybrid Journal   (Followers: 2)
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 4)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Concrete Operators     Open Access   (Followers: 4)
Confluentes Mathematici     Hybrid Journal  
COSMOS     Hybrid Journal  
Cryptography and Communications     Hybrid Journal   (Followers: 14)
Cuadernos de Investigación y Formación en Educación Matemática     Open Access  
Cubo. A Mathematical Journal     Open Access  
Czechoslovak Mathematical Journal     Hybrid Journal   (Followers: 1)
Demographic Research     Open Access   (Followers: 11)
Demonstratio Mathematica     Open Access  
Dependence Modeling     Open Access  
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 28)
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: 2)
Discrete Mathematics     Hybrid Journal   (Followers: 8)
Discrete Mathematics & Theoretical Computer Science     Open Access  
Discrete Mathematics, Algorithms and Applications     Hybrid Journal   (Followers: 2)
Discussiones Mathematicae Graph Theory     Open Access   (Followers: 1)
Dnipropetrovsk University Mathematics Bulletin     Open Access  
Doklady Mathematics     Hybrid Journal  
Duke Mathematical Journal     Full-text available via subscription   (Followers: 1)
Edited Series on Advances in Nonlinear Science and Complexity     Full-text available via subscription  
Electronic Journal of Graph Theory and Applications     Open Access   (Followers: 2)
Electronic Notes in Discrete Mathematics     Full-text available via subscription   (Followers: 2)
Elemente der Mathematik     Full-text available via subscription   (Followers: 3)
Energy for Sustainable Development     Hybrid Journal   (Followers: 9)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Ensino da Matemática em Debate     Open Access  
Entropy     Open Access   (Followers: 5)
ESAIM: Control Optimisation and Calculus of Variations     Full-text available via subscription   (Followers: 1)
European Journal of Combinatorics     Full-text available via subscription   (Followers: 5)
European Journal of Mathematics     Hybrid Journal   (Followers: 1)
European Scientific Journal     Open Access   (Followers: 2)
Experimental Mathematics     Hybrid Journal   (Followers: 4)
Expositiones Mathematicae     Hybrid Journal   (Followers: 2)
Facta Universitatis, Series : Mathematics and Informatics     Open Access  
Fasciculi Mathematici     Open Access  
Finite Fields and Their Applications     Full-text available via subscription   (Followers: 4)
Fixed Point Theory and Applications     Open Access   (Followers: 1)

        1 2 3 4 | Last

Journal Cover Acta Mathematica Hungarica
  [SJR: 0.53]   [H-I: 29]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1588-2632 - ISSN (Online) 0236-5294
   Published by Springer-Verlag Homepage  [2353 journals]
  • A note on Jeśmanowicz’ conjecture concerning primitive
           Pythagorean triples. II
    • Abstract: Abstract Let \({(m^2 - n^2, 2mn, m^2 + n^2)}\) be a primitive Pythagorean triple such that m, n are positive integers with \({ \gcd (m,n)=1}\) , \({m > n}\) , \({m\not\equiv n\pmod{2}}\) . In 1956, Jeśmanowicz conjectured that the only positive integer solution to the exponential Diophantine equation \({(m^2-n^2)^x + (2mn)^y = (m^2+n^2)^z}\) is x =  y =  z =  2. Let \({(m,n)\equiv(u,v)\pmod{d}}\) denote \({m\equiv u\pmod{d}}\) and \({n\equiv v\pmod{d}}\) . Using the theory of quartic residue character and elementary method, we first prove Jeśmanowicz’ conjecture in the following cases. (i) \({(m,n)\equiv(1,2)\pmod{4}}\) . (ii) \({(m,n)\equiv(3,2)}\) , \({(7,6)\pmod{8}}\) or \({(m,n)\equiv(3,6)}\) , (7,2), (11,14), (15,10) \({(\mod{16})}\) . (iii) \({(m,n)\equiv(3,14)}\) , (7,10), (11,6), \({(15,2)\pmod{16}}\) and \({y > 1}\) . Then, by using the above results, two lemmas that based on Laurent’s deep result and computer assistance, for \({n\equiv2\pmod{4}}\) with \({n < 600}\) , we prove the conjecture without any assumption on m.
      PubDate: 2017-09-15
       
  • Cobordism groups of simple branched coverings
    • Abstract: Abstract We consider branched coverings which are simple in the sense that any point of the target has at most one singular preimage. The cobordism classes of k-fold simple branched coverings between n-manifolds form an abelian group \({{\rm Cob}^1(n, k)}\) . Moreover, \({{\rm Cob}^1(*, k) = \bigoplus_{n = 0}^{\infty}{\rm Cob}^1(n, k)}\) is a module over \({\Omega^{SO}_{*}}\) . We construct a universal k-fold simple branched covering, and use it to compute this module rationally. As a corollary, we determine the rank of the groups \({{\rm Cob}^1(n, k)}\) . In the case n =  2 we compute the group \({{\rm Cob}^1(2, k)}\) , give a complete set of invariants and construct generators.
      PubDate: 2017-09-15
       
  • Hypergeometric Cauchy numbers and polynomials
    • Abstract: Abstract For positive integers N and M, the general hypergeometric Cauchy polynomials c M,N,n (z) (M, N ≥ 1; n ≥ 0) are defined by $$\frac{1}{(1+t)^z} \frac{1}{{}_2F_1(M,N;N+1;-t)}=\sum_{n=0}^\infty c_{M,N,n}(z)\, \frac{t^n}{n!}\,, $$ where \({{}_2 F_1(a,b;c;z)}\) is the Gauss hypergeometric function. When M = N = 1, c n  = c 1,1,n are the classical Cauchy numbers. In 1875, Glaisher gave several interesting determinant expressions of numbers, including Bernoulli, Cauchy and Euler numbers. In the aspect of determinant expressions, hypergeometric Cauchy numbers are the natural extension of the classical Cauchy numbers, though many kinds of generalizations of the Cauchy numbers have been considered by many authors. In this paper, we show some interesting expressions of generalized hypergeometric Cauchy numbers. We also give a convolution identity for generalized hypergeometric Cauchy polynomials.
      PubDate: 2017-09-15
       
  • Marcinkiewicz summability of Fourier series, Lebesgue points and strong
           summability
    • Authors: F. Weisz
      Abstract: Abstract Under some conditions on \({\theta}\) , we characterize the set of convergence of the Marcinkiewicz- \({\theta\mbox{-}}\) means of a function \({f \in L_1(\mathbb{T}^d)}\) . More exactly, the \({\theta\mbox{-}}\) means converge to f at each modified strong Lebesgue point. The same holds for a weaker version of Lebesgue points, for the so called modified Lebesgue points of \({f \in L_p(\mathbb{T}^d)}\) , whenever \({1 < p < \infty}\) . The \({\theta\mbox{-}}\) summability includes the Fejér, Abel, Cesàro and some other summations. As an application we give simple proofs for the classical one-dimensional strong summability results of Hardy and Littlewood, Marcinkiewicz, Zygmund and Gabisoniya and generalize them for strong \({\theta\mbox{-}}\) summability.
      PubDate: 2017-09-14
      DOI: 10.1007/s10474-017-0737-z
       
  • Finiteness in real real cubic fields
    • Authors: Z. Masáková; M. Tinková
      Abstract: Abstract We study finiteness property in numeration systems with cubic Pisot unit base. A base β > 1 is said to satisfy property (F), if the set Fin (β) of numbers with finite β-expansions forms a ring. We show that in every real cubic field which is not totally real, there exists a cubic Pisot unit satisfying (F). On the other hand, there exist totally real cubic fields without such a unit. In such fields, however, one finds a cubic Pisot unit β > 1 satisfying property (−F), i.e., the set Fin (−β) of finite (−β)-expansions forms a ring.
      PubDate: 2017-09-14
      DOI: 10.1007/s10474-017-0757-8
       
  • On the connectivity of infinite graphs
    • Authors: P. Komjáth
      Abstract: Abstract Let \({\mu \geq \omega}\) be regular, assume the Generalized Continuum Hypothesis and the principle \({\square_\lambda}\) holds for every singular \({\lambda}\) with \({{\rm cf}(\lambda) \leq \mu}\) . Let X be a graph with chromatic number greater than \({\mu^+}\) . Then X contains a \({\mu}\) -connected subgraph Y of X whose chromatic number is greater than \({\mu^+}\) .
      PubDate: 2017-09-14
      DOI: 10.1007/s10474-017-0752-0
       
  • A common fixed point theorem of Jungck in rectangular b-metric spaces
    • Authors: Z. D. Mitrović; S. Radenović
      Abstract: Abstract We give a proof for the common fixed point theorem of Jungck in rectangular b-metric spaces. As a corollary, we obtain well known common fixed point theorems in b-metric spaces.
      PubDate: 2017-09-14
      DOI: 10.1007/s10474-017-0750-2
       
  • Closed discrete selections for sequences of open sets in function spaces
    • Authors: V. V. Tkachuk
      Abstract: Abstract Given a sequence \({\mathcal{U} =\{U_n: n \in \omega\}}\) of non-empty open subsets of a space X, a set \({\{x_n : n \in \omega\}}\) is a selection of \({\mathcal{U}}\) if \({x_n \in U_n}\) for every \({n \in \omega}\) . We show that a space X is uncountable if and only if every sequence of non-empty open subsets of C p (X) has a closed discrete selection. The same statement is not true for \({C_p(X,[0,1])}\) so we study when the above selection property (which we call discrete selectivity) holds in \({C_p(X,[0,1])}\) . We prove, among other things, that \({C_p(X, [0,1])}\) is discretely selective if X is an uncountable Lindelöf \({\Sigma}\) -space. We also give a characterization, in terms of the topology of X, of discrete selectivity of \({C_p(X,[0,1])}\) if X is an \({\omega}\) -monolithic space of countable tightness.
      PubDate: 2017-09-14
      DOI: 10.1007/s10474-017-0756-9
       
  • Grand Martingale Hardy spaces
    • Authors: Z. Hao; L. Li
      Abstract: Abstract We introduce grand Hardy spaces defined on a probability space. Analogous to the classical theory, we prove Doob’s maximal inequality and obtain atomic characterization of grand Hardy martingale spaces. Finally, we investigate the John–Nirenberg theorem in the frame of grand Hardy spaces.
      PubDate: 2017-09-14
      DOI: 10.1007/s10474-017-0741-3
       
  • On the simultaneous distribution of powers of prime numbers modulo one
    • Authors: X.-W. Ma
      Abstract: Abstract We study the distribution of the sequence of vectors \({(p^{{\alpha}_1},\ldots,p^{{\alpha}_k})}\) modulo one. Here p runs over prime numbers, k ≥ 2 is a fixed integer, α1, . . . , α k are fixed real numbers lying in the interval (s, s + 1) with s being a sufficiently large integer.
      PubDate: 2017-09-14
      DOI: 10.1007/s10474-017-0746-y
       
  • Extensions of T 0 -quasi-metrics
    • Abstract: Abstract Let \({(X, m, \leq)}\) be a partially ordered metric space, that is, a metric space (X, m) equipped with a partial order \({\leq}\) on X. We say that a T 0-quasi-metric d on X is m-splitting provided that \({d\vee d^{-1}=m}\) . Furthermore d is said to be \({(X, m, \leq)}\) -producing provided that d is m-splitting and the specialization partial preorder of d is equal to \({\leq}\) . It is known and easy to see that if \({(X, m, \leq)}\) is a partially ordered metric space that is produced by a T 0-quasi-metric and \({\leq}\) is a total order, then there exists exactly one producing T 0-quasi-metric on X. We first will give an example that shows that a partially ordered metric space can be uniquely produced by a T 0-quasi-metric although \({\leq}\) is not total. Then we present solutions to the following two problems: Let \({(X, m, \leq)}\) be a partially ordered metric space and A a subset of X. (1) Suppose that d is a T 0-quasi-metric on A which is \({m\vert ({A \times A})}\) -splitting. When can d be extended to an m-splitting T 0-quasi-metric \({\widetilde{d}}\) on X' (2) Suppose that d is a T 0-quasi-metric on A which is \({(A, m\vert (A\times A)}\) , \({{\leq}\vert ({A\times A}))}\) -producing. When can d be extended to a T 0-uasi-metric \({\widetilde{d}}\) on X that produces \({(X, m, \leq)'}\)
      PubDate: 2017-09-08
      DOI: 10.1007/s10474-017-0753-z
       
  • An effective Bombieri–Vinogradov theorem and its applications
    • Abstract: Abstract We use suitably Page’s theorem to get effective results for interesting problems, by avoiding the ineffective Siegel’s theorem.
      PubDate: 2017-09-07
      DOI: 10.1007/s10474-017-0745-z
       
  • Pencilled regular parallelisms
    • Abstract: Abstract Over any field \({\mathbb{K}}\) , there is a bijection between regular spreads of the projective space \({{\rm PG}(3,\mathbb{K})}\) and 0-secant lines of the Klein quadric in \({{\rm PG}(5,\mathbb{K})}\) . Under this bijection, regular parallelisms of \({{\rm PG}(3,\mathbb{K})}\) correspond to hyperflock determining line sets (hfd line sets) with respect to the Klein quadric. An hfd line set is defined to be pencilled if it is composed of pencils of lines. We present a construction of pencilled hfd line sets, which is then shown to determine all such sets. Based on these results, we describe the corresponding regular parallelisms. These are also termed as being pencilled. Any Clifford parallelism is regular and pencilled. From this, we derive necessary and sufficient algebraic conditions for the existence of pencilled hfd line sets.
      PubDate: 2017-09-07
      DOI: 10.1007/s10474-017-0742-2
       
  • Lebedev type index transforms with the squares of the associated Legendre
           functions
    • Abstract: Abstract The classical Lebedev index transform [3] involving squares and products of the Legendre functions is generalized on the associated Legendre functions of an arbitrary order. Mapping properties are investigated in the Lebesgue spaces. Inversion formulas are proved. As an application, a solution to the boundary value problem for a third order partial differential equation is obtained.
      PubDate: 2017-09-07
      DOI: 10.1007/s10474-017-0748-9
       
  • Besov and Triebel–Lizorkin spaces associated with Laguerre
           expansions of Hermite type
    • Abstract: Abstract Homogeneous Besov and Triebel–Lizorkin spaces associated with multi-dimensional Laguerre function expansions of Hermite type with index \({\alpha\in [-1/2,\infty)^d\setminus(-1/2,1/2)^d}\) , \({d\geq 1}\) , are defined and investigated. To achieve expected goals Schwartz type spaces on \({\mathbb{R}^d_+}\) are introduced and then tempered type distributions are constructed. Also, ideas from a recent paper of Bui and Duong on Besov and Triebel–Lizorkin spaces associated with Hermite functions expansions are used. This means, in particular, using molecular decomposition and an appropriate form of a Calderón reproducing formula.
      PubDate: 2017-09-07
      DOI: 10.1007/s10474-017-0747-x
       
  • Individual stability and instability for evolutionary processes
    • Abstract: Abstract We study the individual behaviour of uniform and nonuniform evolutionary processes. In [2] R. Datko gave a necessary and sufficient condition for the uniform exponential stability of an evolutionary process in Banach space. Our aim is to show that for a single vector x and not global, as Datko did in his paper, the trajectory of an evolutionary process on that vector x is exponentially stable.
      PubDate: 2017-09-07
      DOI: 10.1007/s10474-017-0754-y
       
  • Finite groups with certain kind of subgroups weakly c -supplemented
    • Abstract: Abstract Let G be a finite group. A subgroup H of G is called an \({\mathcal{H}}\) -subgroup in G if \({N_{G}(H)\cap H^{g} \leq H}\) for all \({g\in G}\) . A subgroup H of G is called weakly c-supplemented in G if G has a subgroup K such that G = HK and \({ H\cap K}\) is an \({\mathcal{H}}\) -subgroup in G. We investigate the structure of finite groups by means of weakly c-supplemented subgroups. Some recent results about supersolvability of finite groups are generalized to a saturated formation containing the class of all supersolvable groups.
      PubDate: 2017-09-07
      DOI: 10.1007/s10474-017-0738-y
       
  • A Dirichlet type problem for complex polyharmonic functions
    • Abstract: Abstract We extend holomorphically polyharmonic functions on a real ball to a complex set being the union of rotated balls. We solve a Dirichlet type problem for complex polyharmonic functions with the boundary condition given on the union of rotated spheres.
      PubDate: 2017-09-07
      DOI: 10.1007/s10474-017-0740-4
       
  • Groups with only σ -semipermutable and σ -abnormal subgroups
    • Abstract: Abstract Let \({\sigma =\{\sigma_{i} i\in I\}}\) be a partition of the set of all primes \({\mathbb{P}}\) and G a finite group. Then \({\sigma(G)=\{\sigma_{i}\ \ \sigma _{i}\cap \pi (G)\ne \emptyset\}}\) . A set \({\mathcal{H}}\) of subgroups of G is said to be a complete Hall \({\sigma }\) -set of G if every member ≠ 1 of \({\mathcal{H}}\) is a Hall \({\sigma _{i}}\) -subgroup of G for some i, and \({\mathcal{H}}\) contains exactly one Hall \({\sigma _{i}}\) -subgroup of G for every \({{\sigma _{i} \in \sigma (G)}}\) . 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 \({\sigma}\) -semi-per-mutable in G if G possesses a complete Hall \({\sigma}\) -set \({\mathcal{H}}\) such that AH x  = H x A for all x∈G and all \({H\in \mathcal{H}}\) such that \({\sigma (H)\cap \sigma (A)=\emptyset}\) ; \({{\sigma}}\) -abnormal in G if L/K L is not \({\sigma}\) -primary whenever \({{A\leq K < L \leq G}}\) . In this paper, we describe finite groups in which every subgroup is either \({{\sigma}}\) -semipermutable or \({{\sigma}}\) -abnormal in G.
      PubDate: 2017-09-07
      DOI: 10.1007/s10474-017-0743-1
       
  • The Dirichlet problem in weighted norm
    • Abstract: Abstract We study the classical Dirichlet problem in the disc with the weighted uniform norm for the weight function \({w(x) = v(x)\prod_{j=1}^s \sin(\frac{x-x_j}{2}) ^{\lambda_j}}\) , \({\{\lambda_{j}\}_{j=1}^{s}}\) are positive numbers and v is a strictly positive continuous function on the circle. Remarkably the problem has solution if and only if none of the numbers \({\{\lambda_{j}\}_{j=1}^{s}}\) is natural.
      PubDate: 2017-09-07
      DOI: 10.1007/s10474-017-0749-8
       
 
 
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