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MATHEMATICS (645 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)
Academic Voices : A Multidisciplinary Journal     Open Access   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 6)
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: 10)
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: 5)
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: 4)
Advances in Difference Equations     Open Access   (Followers: 1)
Advances in Fixed Point Theory     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 9)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 1)
Advances in Materials Sciences     Open Access   (Followers: 16)
Advances in Mathematical Physics     Open Access   (Followers: 6)
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: 5)
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)
Algebra and Logic     Hybrid Journal   (Followers: 2)
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: 9)
Algorithms Research     Open Access   (Followers: 1)
American Journal of Biostatistics     Open Access   (Followers: 9)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 3)
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: 4)
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: 8)
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: 2)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 4)
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: 17)
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: 3)
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: 17)
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: 1)
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: 12)
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: 7)
Discrete Mathematics & Theoretical Computer Science     Open Access  
Discrete Mathematics, Algorithms and Applications     Hybrid Journal   (Followers: 2)
Discussiones Mathematicae Graph Theory     Open Access   (Followers: 1)
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: 4)
ESAIM: Control Optimisation and Calculus of Variations     Full-text available via subscription   (Followers: 1)
European Journal of Combinatorics     Full-text available via subscription   (Followers: 4)
European Journal of Mathematics     Hybrid Journal   (Followers: 1)
European Scientific Journal     Open Access   (Followers: 2)
Experimental Mathematics     Hybrid Journal   (Followers: 3)
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)
Formalized Mathematics     Open Access   (Followers: 2)
Foundations and Trends® in Econometrics     Full-text available via subscription   (Followers: 4)

        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  [2329 journals]
  • On size, order, diameter and edge-connectivity of graphs
    • Authors: P. Ali; J. P. Mazorodze; S. Mukwembi; T. Vetrík
      Pages: 11 - 24
      Abstract: To bound the size (the number of edges) of a graph in terms of other parameters of a graph forms an important family of problems in the extremal graph theory. We present a number of upper bounds on the size of general graphs and triangle-free graphs. We bound the size of any graph and of any triangle-free graph in terms of its order (number of vertices), diameter and edge-connectivity. We also give an upper bound on the size of triangle-free graphs of given order, diameter and minimum degree. All bounds presented in this paper are asymptotically sharp.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0699-1
      Issue No: Vol. 152, No. 1 (2017)
  • Critical bases for ternary alphabets
    • Authors: V. Komornik; M. Pedicini
      Pages: 25 - 57
      Abstract: Glendinning and Sidorov discovered an important feature of the Komornik–Loreti constant \({q' \approx 1.78723}\) in non-integer base expansions on two-letter alphabets: in bases \({1 < q < q'}\) only countably numbers have unique expansions, while for \({q \geq q'}\) there is a continuum of such numbers. We investigate the analogous question for ternary alphabets.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0706-6
      Issue No: Vol. 152, No. 1 (2017)
  • Some integrals of hypergeometric functions
    • Authors: A. Biró
      Pages: 58 - 71
      Abstract: We consider a certain definite integral involving the product of two classical hypergeometric functions having complicated arguments. We show the surprising fact that this integral does not depend on the parameters of the hypergeometric functions.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0700-z
      Issue No: Vol. 152, No. 1 (2017)
  • An upper estimate for the discrepancy of irrational rotations
    • Authors: K. Doi; N. Shimaru; K. Takashima
      Pages: 109 - 113
      Abstract: We give an upper bound for the discrepancy of irrational rotations \({\{n\alpha\}}\) in terms of the continued fraction expansion of \({\alpha}\) and the related Ostrowski expansion. Our result improves earlier bounds in the literature and substantially simplifies their proofs.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0702-x
      Issue No: Vol. 152, No. 1 (2017)
  • Projections onto closed convex sets in Hilbert spaces
    • Authors: A. Domokos; J. M. Ingram; M. M. Marsh
      Pages: 114 - 129
      Abstract: Let X be a real Hilbert space. We give necessary and sufficient algebraic conditions for a mapping \({F\colon X \to X}\) with a closed image set to be the metric projection mapping onto a closed convex set. We provide examples that illustrate the necessity of each of the conditions. Our characterizations generalize several results related to projections onto closed convex sets.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0691-9
      Issue No: Vol. 152, No. 1 (2017)
  • On L p inequalities involving polar derivative of a polynomial
    • Authors: N. K. Govil; P. Kumar
      Pages: 130 - 139
      Abstract: We prove that if P(z) is a polynomial of degree n with zeros z m , that satisfy \({ z_m \geq K_m \geq 1}\) , \({1 \leq m \leq n}\) , then for any p > 0, and for every complex number α, with \({ \alpha \geq 1}\) , we have $$\bigg\{\int_0^{2\pi} D_{\alpha}\{P(e^{i \theta})\} ^{p}\,d\theta\bigg\}^{{1}/{p}}\leq n( \alpha +t_0)G_{p}\bigg\{\int_0^{2\pi} P(e^{i\theta}) ^{p}\,d\theta\bigg\}^{{1}/{p}},$$ where \({G_{p}=\big\{\frac{2\pi}{\int_0^{2\pi} t_0+e^{i\theta} ^{p}\,d\theta}\big\}^{{1}/{p}}}\) , and \({t_0=\big\{1+\frac{n}{\sum_{m=1}^n\frac{1}{K_m-1}}\big\}}\) if \({K_{m}>1}\) \({(1\leq m \leq n)}\) , and t 0 = 1 if K m  = 1 for some m, \({1\leq m\leq n}\) . Our results generalize and sharpen several of the known results.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0693-7
      Issue No: Vol. 152, No. 1 (2017)
  • Polynomial entropy and expansivity
    • Authors: A. Artigue; D. Carrasco-Olivera; I. Monteverde
      Pages: 140 - 149
      Abstract: We study the polynomial entropy of homeomorphisms on compact metric spaces. We construct a homeomorphism on a compact metric space with vanishing polynomial entropy that it is not equicontinuous. Also we give examples with arbitrarily small polynomial entropy. Finally, we show that expansive homeomorphisms and positively expansive maps of compact metric spaces with infinitely many points have polynomial entropy greater than or equal to 1.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0689-3
      Issue No: Vol. 152, No. 1 (2017)
  • Extendability to summable ideals
    • Authors: P. Klinga; A. Nowik
      Pages: 150 - 160
      Abstract: We continue our work on the ideal version of the Lévy–Steinitz theorem on conditionally convergent series of vectors. In particular, we prove that for each series \({\sum_{n\in\omega}v_n}\) , \({(v_n)_{n\in\omega} \subset\mathbb{R}^2}\) , such that its sum range is \({\mathbb{R}^2}\) and its set of Lévy vectors is of power at least 3, it is possible to find \({A\in\mathcal{I}}\) such that the sum range of \({\sum_{n\in A}v_n}\) is still \({\mathbb{R}^2}\) , for some proper ideal \({\mathcal{I}\subset\mathcal{P}(\omega)}\) . We also work on the summability of certain known ideals as well as introduce the cardinal number \({\kappa_{M}}\) as the minimal number of summable ideals required to cover an ideal, and prove some basic properties of it.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0704-8
      Issue No: Vol. 152, No. 1 (2017)
  • On a theorem of Galvin and Nagy
    • Authors: P. Komjáth
      Pages: 161 - 165
      Abstract: We give complete proofs of the results of Galvin and Nagy on a problem of Erdős and Hajnal concerning certain combinatorial games of transfinite length.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0705-7
      Issue No: Vol. 152, No. 1 (2017)
  • A quantum subgroup depth
    • Authors: A. Hernandez; L. Kadison; S. A. Lopes
      Pages: 166 - 185
      Abstract: The Green ring of the half quantum group \({H=U_n(q)}\) is computed in [9]. The tensor product formulas between indecomposables may be used for a generalized subgroup depth computation in the setting of quantum groups—to compute the depth of the Hopf subalgebra H in its Drinfeld double D(H). In this paper the Hopf subalgebra quotient module Q (a generalization of the permutation module of cosets for a group extension) is computed and, as H-modules, Q and its second tensor power are decomposed into a direct sum of indecomposables. We note that the least power n, referred to as depth, for which \({Q^{\otimes (n)}}\) has the same indecomposable constituents as \({Q^{\otimes (n+1)}}\) is \({n = 2}\) , since \({ Q^{\otimes (2)}}\) contains all H-module indecomposables, which determines the minimum even depth \({d_{\mathrm{ev}}(H,D(H)) = 6}\) .
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0694-6
      Issue No: Vol. 152, No. 1 (2017)
  • Bounded operators on vector-valued weak Orlicz martingale spaces
    • Authors: A. Yang
      Pages: 186 - 200
      Abstract: This paper is devoted to studying the boundedness of sublinear operators on vector-valued weak Orlicz martingale spaces. These results closely depend on the geometrical properties of the Banach space in which the martingales take values. Also the results obtained here extend the corresponding known results from scalar-valued setting to vector-valued setting.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0710-x
      Issue No: Vol. 152, No. 1 (2017)
  • Norm convergence of double Fourier series on unbounded Vilenkin groups
    • Authors: G. Gát; U. Goginava
      Pages: 201 - 216
      Abstract: We study approximation by rectangular partial sums of double Fourier series on unbounded Vilenkin groups in the spaces C and L 1. From these results we obtain criterions of the uniform convergence and L-convergence of double Vilenkin–Fourier series. We also prove that these results are sharp.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0703-9
      Issue No: Vol. 152, No. 1 (2017)
  • Sharp constants in asymptotic higher order Markov inequalities
    • Authors: V. Totik; Y. Zhou
      Pages: 227 - 242
      Abstract: The best asymptotic constant for k-th order Markov inequality on a general compact set is determined.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0709-3
      Issue No: Vol. 152, No. 1 (2017)
  • A note on property ( $${W_E}$$ W E )
    • Authors: A. Liu
      Pages: 243 - 256
      Abstract: We investigate a new spectrum property ( \({W_E}\) ), which extends the generalized Weyl theorem. Using the property of consistence in Fredholm and index, we establish for a bounded linear operator T defined on a Hilbert space sufficient and necessary conditions for which the property \({(W_E)}\) holds. We also explore conditions on Hilbert operators T and S so that property \({(W_E)}\) holds for \({T\oplus S}\) . Moreover, we study the permanence of property \({(W_E)}\) under perturbations by power finite rank operators commuting with T and discuss the relation between property ( \({W_E}\) ) and hypercyclic operators.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0707-5
      Issue No: Vol. 152, No. 1 (2017)
  • Morasses, semimorasses and supercompact ultrafilters
    • Authors: L. Pereira
      Pages: 257 - 268
      Abstract: We prove that morasses are not only compatible with supercompact cardinals, but, moreover, simplified morasses can be elements of the supercompact ultrafilter. We also give an application of this fact to the construction of continuous tree-like scales.
      PubDate: 2017-06-01
      DOI: 10.1007/s10474-017-0708-4
      Issue No: Vol. 152, No. 1 (2017)
  • A note on weak reciprocal Dunford–Pettis sets
    • Authors: I. Ghenciu
      Abstract: A bounded subset K of X is defined to be a weak reciprocal Dunford–Pettis set (or wRDP set) if T(K) is relatively weakly compact for each completely continuous operator \({T \colon X \to c_0}\) . A Banach space X has the R * property if every wRDP subset of X is relatively weakly compact. In this paper we study weak reciprocal Dunford–Pettis sets and Banach spaces with property R *.
      PubDate: 2017-05-19
      DOI: 10.1007/s10474-017-0723-5
  • King spaces and compactness
    • Authors: V. Gutev
      Abstract: Using the framework of weak selections, Nagao and Shakhmatov introduced topological king spaces, and extended the classical “King Chicken Theorem” by showing that each compact space with a continuous weak selection is a king space. They also obtained that several king spaces are compact, and raised the question whether every locally compact (or locally pseudocompact) king space must be compact. In the present paper, we settle this question in the affirmative.
      PubDate: 2017-04-18
      DOI: 10.1007/s10474-017-0713-7
  • Hamiltonicity, minimum degree and leaf number
    • Authors: P. Mafuta; S. Mukwembi; S. Munyira; T. Vetrík
      Abstract: We prove a new sufficient condition for a connected graph to be Hamiltonian in terms of the leaf number and the minimum degree. Our results give solutions to conjectures on the Hamiltonicity and traceability of graphs. We considerably generalize known results in the area by showing that if G is a connected graph having minimum degree \({\delta}\) and leaf number L such that \({\delta \ge \frac{L}{2}+1}\) , then G is Hamiltonian and thus traceable.
      PubDate: 2017-04-18
      DOI: 10.1007/s10474-017-0716-4
  • On lattice-valued maps stemming from the notion of optimal average
    • Authors: N. K. Agbeko; W. Fechner; E. Rak
      Abstract: The main purpose of this paper is to study certain lattice-valued maps through associated functional equations and inequalities. We deal with morphisms between an algebraic structure and an ordered structure. Next, we solve a separation problem for the inequalities studied. Moreover, we discuss the Hyers-Ulam stability of our main equation. Our research is motivated by the notion of optimal average, which was introduced by the first author in 1994.
      PubDate: 2017-04-18
      DOI: 10.1007/s10474-017-0719-1
  • Upper Minkowski dimension estimates for convex restrictions
    • Authors: Z. Buczolich
      Abstract: We show that there are functions f in the Hölder class \({C^{\alpha}[0,1]}\) , \({1 < \alpha < 2}\) such that \({f _{A}}\) is neither convex nor concave for any \({A\subset [0,1]}\) with \({\overline{{\rm dim}}_\textsc{M}\,A > \alpha-1}\) . Our earlier result shows that for the typical/generic \({f\in C_1^{\alpha}[0,1]}\) , \({0\leq \alpha < 2}\) there is always a set \({A\subset [0,1]}\) such that \({f _A}\) is convex and \({\overline{{\rm dim}}_\textsc{M}\,A=1}\) . The analogous statement for monotone restrictions is the following: there are functions \({f}\) in the Hölder class \({C^{\alpha}[0,1]}\) , \({1/2 \leq \alpha < 1}\) such that \({f _{A}}\) is not monotone on \({A\subset [0,1]}\) with \({\overline{{\rm dim}}_\textsc{M}\,A > \alpha}\) . This statement is not true for the range of parameters \({\alpha < 1/2}\) and the main theorem of this paper for the parameter range \({1< \alpha < 3/2}\) cannot be obtained by integration of the result about monotone restrictions.
      PubDate: 2017-04-18
      DOI: 10.1007/s10474-017-0712-8
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