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  Subjects -> MATHEMATICS (Total: 879 journals)
    - APPLIED MATHEMATICS (71 journals)
    - GEOMETRY AND TOPOLOGY (19 journals)
    - MATHEMATICS (651 journals)
    - MATHEMATICS (GENERAL) (42 journals)
    - NUMERICAL ANALYSIS (19 journals)
    - PROBABILITIES AND MATH STATISTICS (77 journals)

MATHEMATICS (651 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: 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: 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: 10)
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: 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: 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: 3)
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: 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: 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: 21)
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: 2)
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: 29)
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)
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: 4)
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)
Formalized Mathematics     Open Access   (Followers: 2)

        1 2 3 4 | Last

Journal Cover Bulletin des Sciences Mathamatiques
  [SJR: 1.942]   [H-I: 24]   [4 followers]  Follow
    
   Full-text available via subscription Subscription journal
   ISSN (Print) 0007-4497
   Published by Elsevier Homepage  [3043 journals]
  • Spectral gap and exponential convergence to equilibrium for a
           multi-species Landau system
    • Authors: Maria Pia Gualdani; Nicola Zamponi
      Pages: 509 - 538
      Abstract: Publication date: August 2017
      Source:Bulletin des Sciences Mathématiques, Volume 141, Issue 6
      Author(s): Maria Pia Gualdani, Nicola Zamponi
      In this paper we prove new constructive coercivity estimates and convergence to equilibrium for a spatially non-homogeneous system of Landau equations with moderately soft potentials. We show that the nonlinear collision operator conserves each species' mass, total momentum, total energy and that the Boltzmann entropy is nonincreasing along solutions of the system. The entropy decay vanishes if and only if the Boltzmann distributions of the single species are Maxwellians with the same momentum and energy. A linearization of the collision operator is computed, which has the same conservation properties as its nonlinear counterpart. We show that the linearized system dissipates a quadratic entropy, and prove existence of spectral gap and exponential decay of the solution towards the global equilibrium. As a consequence, convergence of smooth solutions of the nonlinear problem toward the unique global equilibrium is shown, provided the initial data are sufficiently close to the equilibrium. Our proof is based on new spectral gap estimates and uses a strategy similar to [11] based on an hypocoercivity method developed by Mouhot and Neumann in [27].

      PubDate: 2017-07-23T01:22:23Z
      DOI: 10.1016/j.bulsci.2017.07.002
       
  • Brauer configuration algebras: A generalization of Brauer graph algebras
    • Authors: Edward L. Green; Sibylle Schroll
      Pages: 539 - 572
      Abstract: Publication date: August 2017
      Source:Bulletin des Sciences Mathématiques, Volume 141, Issue 6
      Author(s): Edward L. Green, Sibylle Schroll
      In this paper we introduce a generalization of a Brauer graph algebra which we call a Brauer configuration algebra. As with Brauer graphs and Brauer graph algebras, to each Brauer configuration, there is an associated Brauer configuration algebra. We show that Brauer configuration algebras are finite dimensional symmetric algebras. After studying and analysing structural properties of Brauer configurations and Brauer configuration algebras, we show that a Brauer configuration algebra is multiserial; that is, its Jacobson radical is a sum of uniserial modules whose pairwise intersection is either zero or a simple module. The paper ends with a detailed study of the relationship between radical cubed zero Brauer configuration algebras, symmetric matrices with non-negative integer entries, finite graphs and associated symmetric radical cubed zero algebras.

      PubDate: 2017-07-23T01:22:23Z
      DOI: 10.1016/j.bulsci.2017.06.001
       
  • Arithmetic behaviour of Frobenius semistability of syzygy bundles for
           plane trinomial curves
    • Authors: Trivedi
      Abstract: Publication date: Available online 1 August 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): V. Trivedi
      Here we consider the set of bundles { V n } n ∈ N associated to the plane trinomial curves k [ x , y , z ] / ( h ) . We prove that the Frobenius semistability behaviour of the reduction mod p of V n is a function of the congruence class of p modulo 2 λ h (an integer invariant associated to h). As one of the consequences of this, we prove that if V n is semistable in char   0 then its reduction mod p is strongly semistable, for p in a Zariski dense set of primes. Moreover, for any given finitely many such semistable bundles V n , there is a common Zariski dense set of such primes.

      PubDate: 2017-08-03T03:18:41Z
       
  • Atomic decomposition and weak factorization in generalized Hardy spaces of
           closed forms
    • Authors: Aline Bonami; Justin Feuto; Sandrine Grellier; Luong Dang Ky
      Abstract: Publication date: Available online 29 July 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Aline Bonami, Justin Feuto, Sandrine Grellier, Luong Dang Ky
      We give an atomic decomposition of closed forms on R n , the coefficients of which belong to some Hardy space of Musielak–Orlicz type. These spaces are natural generalizations of weighted Hardy–Orlicz spaces, when the Orlicz function depends on the space variable. One of them, called H log , appears naturally when considering products of functions in the Hardy space H 1 and in BMO. As a main consequence of the atomic decomposition, we obtain a weak factorization of closed forms whose coefficients are in H log . Namely, a closed form in H log is the infinite sum of the wedge product between an exact form in the Hardy space H 1 and an exact form in BMO. The converse result, which generalizes the classical div–curl lemma, is a consequence of [4]. As a corollary, we prove that the real-valued H log space can be weakly factorized.

      PubDate: 2017-08-03T03:18:41Z
      DOI: 10.1016/j.bulsci.2017.07.004
       
  • Short-time asymptotics of the regularizing effect for semigroups generated
           by quadratic operators
    • Authors: M. Hitrik; K. Pravda-Starov; J. Viola
      Abstract: Publication date: Available online 29 July 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): M. Hitrik, K. Pravda-Starov, J. Viola
      We study accretive quadratic operators with zero singular spaces. These degenerate non-selfadjoint differential operators are known to be hypoelliptic and to generate contraction semigroups which are smoothing in the Schwartz space for any positive time. In this work, we study the short-time asymptotics of the regularizing effect induced by these semigroups. We show that these short-time asymptotics of the regularizing effect depend on the directions of the phase space, and that this dependence can be nicely understood through the structure of the singular space. As a byproduct of these results, we derive sharp subelliptic estimates for accretive quadratic operators with zero singular spaces pointing out that the loss of derivatives with respect to the elliptic case also depends on the phase space directions according to the structure of the singular space. Some applications of these results are then given to the study of degenerate hypoelliptic Ornstein-Uhlenbeck operators and degenerate hypoelliptic Fokker-Planck operators.

      PubDate: 2017-08-03T03:18:41Z
      DOI: 10.1016/j.bulsci.2017.07.003
       
  • Fractional Order Differential Switched Systems with Coupled Nonlocal
           Initial and Impulsive Conditions
    • Authors: JinRong Wang; Michal Fečkan; Yong Zhou
      Abstract: Publication date: Available online 29 July 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): JinRong Wang, Michal Fečkan, Yong Zhou
      In this paper, we discuss a new class of fractional order differential switched systems with coupled nonlocal initial and impulsive conditions in R n . We firstly derive a solution formula for this system. Secondly, we utilize three well-known fixed point methods to present the existence results. Moreover, we use Schauder topological degree theory to show a new existence result for resonant case: Landesman-Lazer conditions. Finally, we introduce the concepts of Ulam's type stability and present new stability results in the space of fractional version piecewise continuous functions.

      PubDate: 2017-08-03T03:18:41Z
      DOI: 10.1016/j.bulsci.2017.07.007
       
  • On moments of hypergeometric bivariate weight functions
    • Authors: I. Area; M. Foupouagnigni; E. Godoy; Y. Guemo Tefo
      Abstract: Publication date: Available online 29 July 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): I. Area, M. Foupouagnigni, E. Godoy, Y. Guemo Tefo
      In this work explicit representations of the moments of certain hypergeometric continuous and discrete weight functions are obtained. An algorithm for constructing a sequence of bivariate orthonormal polynomials by using these moments is presented. Finally, the linearization problem between orthonormal polynomials is explicitly solved.

      PubDate: 2017-08-03T03:18:41Z
      DOI: 10.1016/j.bulsci.2017.07.006
       
  • A class of symmetric q-orthogonal polynomials with four free parameters
    • Authors: Iván Area; Mohammad Masjed-Jamei
      Abstract: Publication date: Available online 29 July 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Iván Area, Mohammad Masjed-Jamei
      By using a generalization of Sturm-Liouville problems in q-difference spaces, a class of symmetric q-orthogonal polynomials with four free parameters is introduced. The standard properties of these polynomials, such as a second order q-difference equation, the explicit form of the polynomials in terms of basic hypergeometric series, a three term recurrence relation and a general orthogonality relation are presented. Some particular examples are then studied in detail.

      PubDate: 2017-08-03T03:18:41Z
      DOI: 10.1016/j.bulsci.2017.07.005
       
  • Sharp bounds and T1 theorem for Calderón-Zygmund operators with matrix
           kernel on matrix weighted spaces
    • Authors: Sandra Pott; Andrei Stoica
      Abstract: Publication date: Available online 8 July 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Sandra Pott, Andrei Stoica
      For a matrix A 2 weight W on R p , we introduce a new notion of W-Calderón-Zygmund matrix kernels, following earlier work in [11]. We state and prove a T1 theorem for such operators and give a representation theorem in terms of dyadic W-Haar shifts and paraproducts, in the spirit of [7]. Finally, by means of a Bellman function argument, we give sharp bounds for such operators in terms of bounds for weighted matrix martingale transforms and paraproducts.

      PubDate: 2017-07-09T18:13:19Z
      DOI: 10.1016/j.bulsci.2017.07.001
       
  • Construction of a universal ordinary differential equation C∞ of
           order 3
    • Authors: Etienne Couturier; Nicolas Jacquet
      Abstract: Publication date: Available online 15 June 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Etienne Couturier, Nicolas Jacquet
      A universal ordinary differential equation C ∞ of order 3 is constructed here. The equation is universal in the sense that any continuous function on a real segment can be approximated by a solution of this equation with an arbitrary accuracy in uniform norm.

      PubDate: 2017-06-20T13:08:21Z
      DOI: 10.1016/j.bulsci.2017.06.002
       
  • A linear dimensionless bound for the weighted Riesz vector
    • Authors: Komla Domelevo; Stefanie Petermichl; Janine Wittwer
      Abstract: Publication date: Available online 29 May 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Komla Domelevo, Stefanie Petermichl, Janine Wittwer
      We show that the norm of the vector of Riesz transforms as operator in the weighted Lebesgue space L ω 2 is bounded by a constant multiple of the first power of the Poisson- A 2 characteristic of ω. The bound is free of dimension and optimal. Our argument requires an extension of Wittwer's linear estimate for martingale transforms to the vector valued setting with scalar weights, for which we indicate a proof. Extensions to L ω p for 1 < p < ∞ are discussed. Our arguments to exhibit sharpness at the critical exponent p = 2 require a martingale extrapolation theorem, for which we provide a proof. We also show that for n > 1 , the Poisson- A 2 class is properly included in the classical A 2 class.

      PubDate: 2017-06-01T08:33:52Z
      DOI: 10.1016/j.bulsci.2017.05.004
       
  • Asymmetric (p,2)-equations, superlinear at +∞, resonant at
           −∞
    • Authors: Nikolaos Papageorgiou; Patrick Winkert
      Abstract: Publication date: Available online 26 May 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Nikolaos S. Papageorgiou, Patrick Winkert
      We consider a Dirichlet problem driven by the sum of a p-Laplacian and a Laplacian (known as a ( p , 2 ) -equation) and with a nonlinearity which exhibits asymmetric behavior as s → ± ∞ . More precisely, it is ( p − 1 ) -superlinear near +∞ (but without satisfying the Ambrosetti-Rabinowitz condition) and it is ( p − 1 ) -sublinear near −∞ and possibly resonant with respect to the principal eigenvalue of the p-Laplacian. Using variational tools along with Morse theory we prove a multiplicity theorem generating five nontrivial solutions (one is negative, two are positive, one is nodal and for the the fifth we do not have any information about its sign).

      PubDate: 2017-05-27T07:42:51Z
       
  • Umbilic foliations with integrable normal bundle
    • Authors: S.C. de Almeida; F.G.B. Brito; A.G. Colares
      Abstract: Publication date: Available online 22 May 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): S.C. de Almeida, F.G.B. Brito, A.G. Colares
      In this paper we study the geometric properties of a couple of mutually orthogonal foliations with complementary dimensions. We recall that from Novikov's theorem, there is no foliation of S 3 by closed curves with integrable normal bundle. Nevertheless, for S 2 k + 1 , k ≥ 2 , Novikov's theorem is not applicable. In this paper we show that on odd-dimensional unit spheres there is no umbilical foliation with integrable normal bundle and divergence free mean curvature vector.

      PubDate: 2017-05-27T07:42:51Z
      DOI: 10.1016/j.bulsci.2017.05.002
       
  • Nonorientable manifolds, complex and symplectic structures, and
           characteristic classes
    • Authors: Indranil Biswas; Mahuya Datta
      Abstract: Publication date: Available online 15 May 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Indranil Biswas, Mahuya Datta
      A complex manifold or a symplectic manifold is automatically oriented. We investigate these structures in the context of non-orientable manifolds. Any smooth connected non-orientable manifold is equipped with a real line bundle of order two. Various structures which are defined only on oriented manifolds extend to non-orientable manifolds once they are twisted by this line bundle of order two. Our aim is to develop this theme.

      PubDate: 2017-05-17T04:04:26Z
      DOI: 10.1016/j.bulsci.2017.05.001
       
  • Branes in the moduli space of framed sheaves
    • Authors: Emilio Franco; Marcos Jardim; Simone Marchesi
      Abstract: Publication date: Available online 10 May 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Emilio Franco, Marcos Jardim, Simone Marchesi
      In the physicist's language, a brane in a hyperkähler manifold is a submanifold which is either complex or lagrangian with respect to three Kähler structures of the ambient manifold. By considering the fixed loci of certain involutions, we describe branes in Nakajima quiver varieties of all possible types. We then focus on the moduli space of framed torsion free sheaves on the projective plane, showing how the involutions considered act on sheaves, and proving the existence of branes in some cases.

      PubDate: 2017-05-12T02:27:21Z
      DOI: 10.1016/j.bulsci.2017.04.002
       
  • Sarason's Toeplitz product problem for a class of Fock spaces
    • Authors: Hélène Bommier-Hato; El Hassan Youssfi; Kehe Zhu
      Abstract: Publication date: Available online 8 May 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Hélène Bommier-Hato, El Hassan Youssfi, Kehe Zhu
      Sarason's Toeplitz product problem asks when the operator T u T v ‾ is bounded on various Hilbert spaces of analytic functions, where u and v are analytic. The problem is highly nontrivial for Toeplitz operators on the Hardy space and the Bergman space (even in the case of the unit disk). In this paper, we provide a complete solution to the problem for a class of Fock spaces on the complex plane. In particular, this generalizes an earlier result of Cho, Park, and Zhu.

      PubDate: 2017-05-12T02:27:21Z
      DOI: 10.1016/j.bulsci.2017.03.002
       
  • A modulation technique for the blow-up profile of the vector-valued
           semilinear wave equation
    • Authors: Asma Azaiez; Hatem Zaag
      Abstract: Publication date: Available online 26 April 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Asma Azaiez, Hatem Zaag
      We consider a vector-valued blow-up solution with values in R m for the semilinear wave equation with power nonlinearity in one space dimension (this is a system of PDEs). We first characterize all the solutions of the associated stationary problem as an m-parameter family. Then, we show that the solution in self-similar variables approaches some particular stationary one in the energy norm, in the non-characteristic cases. Our analysis is not just a simple adaptation of the already handled real or complex case. In particular, there is a new structure of the set a stationary solutions.

      PubDate: 2017-05-01T01:04:55Z
      DOI: 10.1016/j.bulsci.2017.04.001
       
  • On quaternionic Monge-Ampère operator, closed positive currents and
           Lelong-Jensen type formula on the quaternionic space
    • Authors: Dongrui Wan; Wei Wang
      Abstract: Publication date: Available online 12 April 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Dongrui Wan, Wei Wang
      In this paper, we introduce the first-order differential operators d 0 and d 1 acting on the quaternionic version of differential forms on the flat quaternionic space H n . The behavior of d 0 , d 1 and △ = d 0 d 1 is very similar to ∂ , ∂ ‾ and ∂ ∂ ‾ in several complex variables. The quaternionic Monge-Ampère operator can be defined as ( △ u ) n and has a simple explicit expression. We define the notion of a closed positive current in the quaternionic case, and extend several results in complex pluripotential theory to the quaternionic case: define the Lelong number of a closed positive current, obtain the quaternionic version of Lelong-Jensen type formula, and generalize Bedford-Taylor theory, i.e., extend the definition of the quaternionic Monge-Ampère operator to locally bounded quaternionic plurisubharmonic functions and prove the corresponding convergence theorem.

      PubDate: 2017-04-16T23:48:04Z
      DOI: 10.1016/j.bulsci.2015.03.001
       
  • An infinity of nodal solutions for superlinear Robin problems with an
           indefinite and unbounded potential
    • Authors: Nikolaos S. Papageorgiou; Vicenţiu D. Rădulescu
      Abstract: Publication date: Available online 5 April 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Nikolaos S. Papageorgiou, Vicenţiu D. Rădulescu
      We consider a semilinear Robin problem driven by the Laplacian plus an indefinite and unbounded using a suitable version of the symmetric mountain pass theorem, we show that the problem has an infinity of nodal solutions whose energy level diverges to +∞.

      PubDate: 2017-04-09T22:40:40Z
      DOI: 10.1016/j.bulsci.2017.03.001
       
  • A priori estimates for relativistic liquid bodies
    • Authors: Todd A. Oliynyk
      Abstract: Publication date: Available online 4 March 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Todd A. Oliynyk
      We demonstrate that a sufficiently smooth solution of the relativistic Euler equations that represents a dynamical compact liquid body, when expressed in Lagrangian coordinates, determines a solution to a system of non-linear wave equations with acoustic boundary conditions. Using this wave formulation, we prove that these solutions satisfy energy estimates without loss of derivatives. Importantly, our wave formulation does not require the liquid to be irrotational, and the energy estimates do not rely on divergence and curl type estimates employed in previous works.

      PubDate: 2017-03-08T15:26:23Z
      DOI: 10.1016/j.bulsci.2017.02.001
       
  • Sharp asymptotics for the minimal mass blow up solution of the critical
           gKdV equation
    • Authors: Vianney Combet; Yvan Martel
      Abstract: Publication date: Available online 20 January 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Vianney Combet, Yvan Martel
      Let S be a minimal mass blow up solution of the critical generalized KdV equation as constructed in [25]. We prove both time and space sharp asymptotics for S close to the blow up time. Let Q be the unique ground state of (gKdV), satisfying Q ″ + Q 5 = Q . First, we show that there exist universal smooth profiles Q k ∈ S ( R ) (with Q 0 = Q ) and a constant c 0 ∈ R such that, fixing the blow up time at t = 0 and appropriate scaling and translation parameters, S satisfies, for any m ⩾ 0 , ∂ x m S ( t ) − ∑ k = 0 [ m / 2 ] 1 t 1 2 + m − 2 k Q k ( m − k ) ( ⋅ + 1 t t + c 0 ) → 0  in  L 2  as  t ↓ 0 . Second, we prove that, for 0 < t ≪ 1 , x ⩽ − 1 t − 1 , S ( t , x ) ∼ − 1 2 ‖ Q ‖ L 1 x − 3 / 2 , and related bounds for the derivatives of S ( t ) of any order. We also prove ∫ R S ( t , x ) d x = 0 .

      PubDate: 2017-01-20T18:52:48Z
      DOI: 10.1016/j.bulsci.2017.01.001
       
  • Nonlocal problems with singular nonlinearity
    • Authors: Annamaria Canino; Luigi Montoro; Berardino Sciunzi; Marco Squassina
      Abstract: Publication date: Available online 20 January 2017
      Source:Bulletin des Sciences Mathématiques
      Author(s): Annamaria Canino, Luigi Montoro, Berardino Sciunzi, Marco Squassina
      We investigate existence and uniqueness of solutions for a class of nonlinear nonlocal problems involving the fractional p-Laplacian operator and singular nonlinearities.

      PubDate: 2017-01-20T18:52:48Z
      DOI: 10.1016/j.bulsci.2017.01.002
       
  • Compact embedding results of Sobolev spaces and existence of positive
           solutions to quasilinear equations
    • Authors: Han
      Abstract: Publication date: January 2017
      Source:Bulletin des Sciences Mathématiques, Volume 141, Issue 1
      Author(s): Qi Han
      In this paper, we study mainly the existence of multiple positive solutions for a quasilinear elliptic equation of the following form on R N , when N ≥ 2 , (0.1) − Δ N u + V ( x ) u N − 2 u = λ u r − 2 u + f ( x , u ) . Here, V ( x ) > 0 : R N → R is a suitable potential function, r ∈ ( 1 , N ) , f ( x , u ) is a continuous function of N-superlinear and subcritical exponential growth without having the Ambrosetti–Rabinowitz condition, while λ > 0 is a constant. A suitable Moser–Trudinger inequality and the compact embedding W V 1 , N ( R N ) ↪ L r ( R N ) are proved to study problem (0.1). Moreover, the compact embedding H V 1 ( R N ) ↪ L K t ( R N ) is also analyzed to investigate the existence of a positive ground state to the following nonlinear Schrödinger equation (0.2) − Δ u + V ( x ) u = K ( x ) g ( u ) with potentials vanishing at infinity in a measure-theoretic sense when N ≥ 3 .

      PubDate: 2017-01-13T16:30:20Z
       
  • Ultragraphs and shift spaces over infinite alphabets
    • Authors: Daniel Gonçalves; Danilo Royer
      Abstract: Publication date: Available online 2 December 2016
      Source:Bulletin des Sciences Mathématiques
      Author(s): Daniel Gonçalves, Danilo Royer
      In this paper we further develop the theory of one-sided shift spaces over infinite alphabets, characterizing one-step shifts as edge shifts of ultragraphs and partially answering a conjecture regarding shifts of finite type (we show that there exists shifts of finite type that are not conjugate, via a conjugacy that is eventually finite periodic, to an edge shift of a graph ). We also show that there exists edge shifts of ultragraphs that are shifts of finite type, but are not conjugate to a full shift, a result that is not true for edge shifts of graphs. One of the key results needed in the proofs of our conclusions is the realization of a class of ultragraph C*-algebras as partial crossed products, a result of interest on its own.

      PubDate: 2016-12-06T05:46:25Z
      DOI: 10.1016/j.bulsci.2016.10.002
       
  • Invertible harmonic mappings of the unit disk onto Dini smooth Jordan
           domains
    • Authors: David Kalaj
      Abstract: Publication date: Available online 17 November 2016
      Source:Bulletin des Sciences Mathématiques
      Author(s): David Kalaj
      In this paper we extend Radó-Kneser-Choquet theorem for the mappings with weak homeomorphic Lipschitz boundary function and Dini's smooth boundary but without restriction on the convexity of the image domain, provided that the Jacobian satisfies a certain boundary condition. The proof is based on a recent extension of Radó-Kneser-Choquet theorem by Alessandrini and Nesi [1] and is used the approximation principle.

      PubDate: 2016-11-24T17:45:41Z
      DOI: 10.1016/j.bulsci.2016.11.001
       
  • On the second cohomology of nilpotent orbits in exceptional Lie algebras
    • Authors: Pralay Chatterjee; Chandan Maity
      Abstract: Publication date: Available online 4 October 2016
      Source:Bulletin des Sciences Mathématiques
      Author(s): Pralay Chatterjee, Chandan Maity
      In [1], the second de Rham cohomology groups of nilpotent orbits in all the complex simple Lie algebras are described. In this paper we consider non-compact non-complex exceptional Lie algebras, and compute the dimensions of the second cohomology groups for most of the nilpotent orbits. For the rest of cases of nilpotent orbits, which are not covered in the above computations, we obtain upper bounds for the dimensions of the second cohomology groups.

      PubDate: 2016-10-04T20:36:49Z
      DOI: 10.1016/j.bulsci.2016.10.001
       
  • Non-normal numbers: Full Hausdorff dimensionality vs zero dimensionality
    • Authors: Sergio Albeverio; Iryna Garko; Muslem Ibragim; Grygoriy Torbin
      Abstract: Publication date: Available online 5 April 2016
      Source:Bulletin des Sciences Mathématiques
      Author(s): Sergio Albeverio, Iryna Garko, Muslem Ibragim, Grygoriy Torbin
      In the present paper we study the dependence of fractal and metric properties of numbers which are non-normal resp. essentialy non-normal w.r.t. a chosen system of numeration. In particular, we solve open problems mentioned in [1] and prove that there exist expansions (the Q ⁎ -expansions or Q ⁎ -representations) for real numbers such that the corresponding sets of essentially non-normal numbers and even the whole set of non-normal numbers are of zero Hausdorff dimension. On the other hand, we show that in the same model of Q ⁎ -expansions it is possible to choose the matrix Q ⁎ in such a way that the corresponding set of essentially non-normal numbers is of full Lebesgue measure. Sufficient conditions for full dimensionality resp. zero dimensionality of the set of essentially non-normal numbers are also presented.

      PubDate: 2016-10-04T20:36:49Z
      DOI: 10.1016/j.bulsci.2016.04.001
       
 
 
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