for Journals by Title or ISSN
for Articles by Keywords
help
  Subjects -> MATHEMATICS (Total: 864 journals)
    - APPLIED MATHEMATICS (68 journals)
    - GEOMETRY AND TOPOLOGY (19 journals)
    - MATHEMATICS (643 journals)
    - MATHEMATICS (GENERAL) (40 journals)
    - NUMERICAL ANALYSIS (19 journals)
    - PROBABILITIES AND MATH STATISTICS (75 journals)

MATHEMATICS (643 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: 4)
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: 15)
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: 3)
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  
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 Numerical Analysis & Computational Mathematics     Hybrid Journal   (Followers: 5)
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: 6)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 1)
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: 19)
Bruno Pini Mathematical Analysis Seminar     Open Access  
Buletinul Academiei de Stiinte a Republicii Moldova. Matematica     Open Access   (Followers: 5)
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: 2)
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)
CAUCHY     Open Access   (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)

        1 2 3 4 | Last

Journal Cover Expositiones Mathematicae
  [SJR: 0.453]   [H-I: 16]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0723-0869
   Published by Elsevier Homepage  [3043 journals]
  • The cardinal Krull dimension of a ring of holomorphic functions
    • Abstract: Publication date: Available online 18 March 2017
      Source:Expositiones Mathematicae
      Author(s): Pete L. Clark
      We give an exposition of a recent result of M. Kapovich on the cardinal Krull dimension of the ring of holomorphic functions on a connected C -manifold. By reducing to the one-dimensional case we give a stronger lower bound for Stein manifolds.

      PubDate: 2017-03-25T06:31:31Z
       
  • Universal p′-central extensions
    • Abstract: Publication date: Available online 5 January 2017
      Source:Expositiones Mathematicae
      Author(s): Caroline Lassueur, Jacques Thévenaz
      It is well-known that a finite group possesses a universal central extension if and only if it is a perfect group. Similarly, given a prime number p , we show that a finite group possesses a universal p ′ -central extension if and only if the p ′ -part of its abelianization is trivial. This question arises naturally when working with group representations over a field of characteristic  p .

      PubDate: 2017-01-11T11:20:22Z
       
  • Orthogonal polynomials and perturbations on measures supported on the real
           line and on the unit circle. A matrix perspective
    • Authors: Luis E. Garza; Francisco Marcellán
      Pages: 287 - 326
      Abstract: Publication date: Available online 11 January 2016
      Source:Expositiones Mathematicae
      Author(s): Luis E. Garza, Francisco Marcellán
      The connection between measures supported on the real line (resp. on the unit circle), Hankel (resp. Toeplitz) matrices, Jacobi (resp. Hessenberg and CMV) matrices, Stieltjes (resp. Carathéodory) functions constitutes a key element in the analysis of orthogonal polynomials on the real line (resp. on the unit circle). In the present contribution, we focus our attention on perturbations of the measures supported either on the real line or the unit circle and their consequences on the behavior of the corresponding sequences of orthogonal polynomials and the matrices associated with the multiplication operator in terms on those polynomial bases. The matrix perspective related to such perturbations from the point of view of factorizations ( L U and Q R ) is emphasized. Finally, we show the role of spectral transformations in the analysis of some integrable systems.

      PubDate: 2016-01-13T16:09:26Z
      DOI: 10.1016/j.exmath.2015.12.007
      Issue No: Vol. 34, No. 3 (2016)
       
  • Addendum to “The Kolmogorov–Riesz compactness theorem” [Expo. Math.
           28 (2010) 385–394]
    • Authors: Harald Hanche-Olsen; Helge Holden
      Pages: 243 - 245
      Abstract: Publication date: Available online 20 January 2016
      Source:Expositiones Mathematicae
      Author(s): Harald Hanche-Olsen, Helge Holden
      We show how to improve on Theorem 10 in Hanche-Olsen and Holden (2010), describing when subsets in W 1 , p ( R n ) are totally bounded subsets of L q ( R n ) for p < n and p ≤ q < p ∗ . This improvement was first shown in Dosso et al. (2013) in the context of Morrey–Sobolev spaces.

      PubDate: 2016-01-25T18:13:29Z
      DOI: 10.1016/j.exmath.2015.12.003
      Issue No: Vol. 34, No. 2 (2016)
       
  • Erratum to “An example concerning iteration and factorization of
           rational functions” [Expo. Math. 11 (1993) 281–283]
    • Authors: Walter Bergweiler
      Pages: 246 - 247
      Abstract: Publication date: Available online 19 February 2016
      Source:Expositiones Mathematicae
      Author(s): Walter Bergweiler


      PubDate: 2016-02-24T10:00:05Z
      DOI: 10.1016/j.exmath.2015.12.004
      Issue No: Vol. 34, No. 2 (2016)
       
  • A journey through loop braid groups
    • Abstract: Publication date: Available online 26 December 2016
      Source:Expositiones Mathematicae
      Author(s): Celeste Damiani
      In this paper we introduce distinct approaches to loop braid groups, a generalization of braid groups, and unify all the definitions that have appeared so far in the literature, with a complete proof of the equivalence of these definitions. These groups have in fact been an object of interest in different domains of mathematics and mathematical physics, and have been called, in addition to loop braid groups, with several names such as of motion groups, groups of permutation-conjugacy automorphisms, braid-permutation groups, welded braid groups and untwisted ring groups. In parallel to this, we introduce an extension of these groups that appears to be a more natural generalization of braid groups from the topological point of view. Throughout the text we motivate the interest in studying loop braid groups and give references to some of their applications.

      PubDate: 2016-12-31T07:33:04Z
       
  • Limit cycles of the classical Liénard differential systems: A survey on
           the Lins Neto, de Melo and Pugh’s conjecture
    • Abstract: Publication date: Available online 26 December 2016
      Source:Expositiones Mathematicae
      Author(s): Jaume Llibre, Xiang Zhang
      In 1977 Lins Neto, de Melo and Pugh (Lins Neto et al., 1977)conjectured that the classical Liénard system x ̇ = y − F ( x ) , y ̇ = − x , with F ( x ) a real polynomial of degree n , has at most [ ( n − 1 ) / 2 ] limit cycles, where [ ⋅ ] denotes the integer part function. In this paper we summarize what is known and what is still open on this conjecture. For the known results on this conjecture we present a complete proof.

      PubDate: 2016-12-31T07:33:04Z
       
  • Positive definiteness of piecewise-linear function
    • Abstract: Publication date: Available online 24 December 2016
      Source:Expositiones Mathematicae
      Author(s): Anatoliy Manov, Viktor Zastavnyi
      Let α ∈ ( 0 , 1 ) , h ∈ R and let f α , h be an even function with the properties: f α , h ( x ) = 0 for x ∈ ( 1 , + ∞ ) , f α , h is linear over the intervals [ 0 , α ] and [ α , 1 ] , f α , h ( 0 ) = 1 , f α , h ( α ) = h , and f α , h ( 1 ) = 0 . In this paper we prove that f α , h is positive definite on R ⟺ m ( α ) ≤ h ≤ 1 − α , where m ( α ) = 0 if 1 / α ∉ N , and m ( α ) = − α if 1 / α ∈ N .

      PubDate: 2016-12-25T06:41:27Z
       
  • Witt’s Cancellation theorem seen as a cancellation
    • Authors: Sunil K. Chebolu; Dan McQuillan; Ján Mináč
      Abstract: Publication date: Available online 8 October 2016
      Source:Expositiones Mathematicae
      Author(s): Sunil K. Chebolu, Dan McQuillan, Ján Mináč
      The year 2017 marks the 80th anniversary of Witt’s famous paper containing key results, including the Witt cancellation theorem, which form the foundation for the algebraic theory of quadratic forms. We pay homage to this paper by presenting a transparent and algebraic proof of the Witt cancellation theorem, which itself is based on a cancellation. We also present an overview of some recent spectacular work which is still building on Witt’s original creation of the algebraic theory of quadratic forms.

      PubDate: 2016-10-12T15:24:31Z
      DOI: 10.1016/j.exmath.2016.10.003
       
  • On a theorem of Blichfeldt
    • Authors: Benjamin Sambale
      Abstract: Publication date: Available online 7 October 2016
      Source:Expositiones Mathematicae
      Author(s): Benjamin Sambale
      Let G be a permutation group on n < ∞ objects. Let f ( g ) be the number of fixed points of g ∈ G , and let { f ( g ) : 1 ≠ g ∈ G } = { f 1 , … , f r } . In this expository note we give a character-free proof of a theorem of Blichfeldt which asserts that the order of G divides ( n − f 1 ) … ( n − f r ) . We also discuss the sharpness of this bound.

      PubDate: 2016-10-12T15:24:31Z
      DOI: 10.1016/j.exmath.2016.10.002
       
  • Representability in supergeometry
    • Authors: R. Fioresi; F. Zanchetta
      Abstract: Publication date: Available online 7 October 2016
      Source:Expositiones Mathematicae
      Author(s): R. Fioresi, F. Zanchetta
      In this paper we use the notion of Grothendieck topology to present a unified way to approach representability in supergeometry, which applies to both the differential and algebraic settings.

      PubDate: 2016-10-12T15:24:31Z
      DOI: 10.1016/j.exmath.2016.10.001
       
  • Variations on a theme by Higman
    • Authors: Nicolas Monod
      Abstract: Publication date: Available online 6 October 2016
      Source:Expositiones Mathematicae
      Author(s): Nicolas Monod
      We propose elementary and explicit presentations of groups that have no amenable quotients and yet are SQ-universal. Examples include groups with a finite K ( π , 1 ) , no Kazhdan subgroups and no Haagerup quotients.

      PubDate: 2016-10-12T15:24:31Z
      DOI: 10.1016/j.exmath.2016.10.004
       
  • On Grothendieck’s Riemann–Rochh theorem
    • Authors: Alberto Navarro
      Abstract: Publication date: Available online 5 October 2016
      Source:Expositiones Mathematicae
      Author(s): Alberto Navarro
      We prove that, for smooth quasi-projective varieties over a field, the K -theory K ( X ) of vector bundles is the universal cohomology theory where c 1 ( L ⊗ L ̄ ) = c 1 ( L ) + c 1 ( L ̄ ) − c 1 ( L ) c 1 ( L ̄ ) . Then, we show that Grothendieck’s Riemann–Rochh theorem is a direct consequence of this universal property, as well as the universal property of the graded K -theory G K • ( X ) ⊗ Q .

      PubDate: 2016-10-05T12:32:10Z
       
  • An extension of the Pólya–Szegö operator inequality
    • Authors: Dinh Trung Hoa; Mohammad Sal Moslehian; Cristian Conde; Pingping Zhang
      Abstract: Publication date: Available online 5 October 2016
      Source:Expositiones Mathematicae
      Author(s): Dinh Trung Hoa, Mohammad Sal Moslehian, Cristian Conde, Pingping Zhang
      We extend an operator Pólya–Szegö type inequality involving the operator geometric mean to any arbitrary operator mean under some mild conditions. Utilizing the Mond–Pečarić method, we present some other related operator inequalities as well.

      PubDate: 2016-10-05T12:32:10Z
      DOI: 10.1016/j.exmath.2016.09.004
       
  • Representation of singular integrals by dyadic operators, and the A2
           theorem
    • Authors: Tuomas
      Abstract: Publication date: Available online 2 October 2016
      Source:Expositiones Mathematicae
      Author(s): Tuomas P. Hytönen
      This exposition presents a self-contained proof of the A 2 theorem, the quantitatively sharp norm inequality for singular integral operators in the weighted space L 2 ( w ) . The strategy of the proof is a streamlined version of the author’s original one, based on a probabilistic Dyadic Representation Theorem for singular integral operators. While more recent non-probabilistic approaches are also available now, the probabilistic method provides additional structural information, which has independent interest and other applications. The presentation emphasizes connections to the David–Journé T ( 1 ) theorem, whose proof is obtained as a byproduct. Only very basic Probability is used; in particular, the conditional probabilities of the original proof are completely avoided.

      PubDate: 2016-10-05T12:32:10Z
       
  • Van den Essen’s theorem on the de Rham cohomology of a holonomic
           D-module over a formal power series ring
    • Authors: Nicholas Switala
      Abstract: Publication date: Available online 2 October 2016
      Source:Expositiones Mathematicae
      Author(s): Nicholas Switala
      In this expository paper, we give a complete proof of van den Essen’s theorem that the de Rham cohomology spaces of a holonomic D -module are finite-dimensional in the case of a formal power series ring over a field of characteristic zero. This proof requires results from at least five of van den Essen’s papers as well as his unpublished thesis, and until now has not been available in a self-contained document.

      PubDate: 2016-10-05T12:32:10Z
       
  • ℓ2-homology of the free group
    • Authors: Matt Clay
      Abstract: Publication date: Available online 1 October 2016
      Source:Expositiones Mathematicae
      Author(s): Matt Clay
      We analyze the reduced ℓ 2 -homology groups of a finitely generated nonabelian free group, F . Specifically, the projection map onto the space of harmonic ℓ 2 -1-chains is explicitly described and a weak isomorphism from ( ℓ 2 ( F ) ) rk ( F ) − 1 to the space of harmonic ℓ 2 -1-chains is given.

      PubDate: 2016-10-05T12:32:10Z
       
  • Strong topologies for spaces of smooth maps with infinite-dimensional
           target
    • Authors: Eivind Otto Hjelle; Alexander Schmeding
      Abstract: Publication date: Available online 3 August 2016
      Source:Expositiones Mathematicae
      Author(s): Eivind Otto Hjelle, Alexander Schmeding
      In this article we study two “strong” topologies for spaces of smooth functions from a finite-dimensional manifold to a (possibly infinite-dimensional) manifold modelled on a locally convex space. Namely, we construct Whitney type topologies for these spaces and a certain refinement corresponding to Michor’s FD -topology. Then we establish the continuity of certain mappings between spaces of smooth mappings, e.g. the continuity of the joint composition map. As a first application we prove that the bisection group of an arbitrary Lie groupoid (with finite-dimensional base) is a topological group (with respect to these topologies). For the reader’s convenience the article includes also a proof of the folklore fact that the Whitney topologies defined via jet bundles coincide with the ones defined via local charts.

      PubDate: 2016-08-07T16:34:26Z
      DOI: 10.1016/j.exmath.2016.07.004
       
  • Lorentz-conformal transformations in the plane
    • Authors: Barbara A. Shipman; Patrick D. Shipman; Stephen P. Shipman
      Abstract: Publication date: Available online 1 August 2016
      Source:Expositiones Mathematicae
      Author(s): Barbara A. Shipman, Patrick D. Shipman, Stephen P. Shipman
      While conformal transformations of the plane preserve Laplace’s equation, Lorentz-conformal mappings preserve the wave equation. This property gives rise to a rich Lorentzian geometry in dimension 1 + 1 . In elucidating the geometry of the Lorentzian plane, this work provides a window into the field of pseudo-Riemannian geometry, where the Lorentzian plane is of fundamental importance. In the Lorentzian plane, curvilinear quadrilaterals and pairs of crossing curves are transformed under nonlinear Lorentz-conformal mappings via geometric constructions that can be expressed also by functional formulas. Classes of Lorentz-conformal maps are characterized by their symmetries under subgroups of the dihedral group of order eight, and unfoldings of non-invertible mappings into invertible ones are reflected in a change of the symmetry group. The questions are simple; but the answers are not obvious, yet have beautiful geometric, algebraic, and functional descriptions and proofs. This is due to the simple form of nonlinear Lorentz-conformal transformations in dimension 1 + 1 , provided by characteristic coordinates.

      PubDate: 2016-08-03T15:22:03Z
      DOI: 10.1016/j.exmath.2016.07.003
       
  • On a dynamical local-global principle in Mordell–Weil type groups
    • Authors: Stefan
      Abstract: Publication date: Available online 18 July 2016
      Source:Expositiones Mathematicae
      Author(s): Stefan Barańczuk
      In this paper we consider certain dynamical local-global principle for Mordell–Weil type groups over number fields like S -units, abelian varieties with trivial ring of endomorphisms and odd algebraic K -theory groups.

      PubDate: 2016-07-24T12:19:30Z
       
  • Uniqueness of CPn
    • Authors: Valentino Tosatti
      Abstract: Publication date: Available online 15 July 2016
      Source:Expositiones Mathematicae
      Author(s): Valentino Tosatti
      We give an exposition of a theorem of Hirzebruch, Kodaira and Yau which proves the uniqueness of the Kähler structure of complex projective space, and of Yau’s resolution of the Severi Conjecture.

      PubDate: 2016-07-16T10:43:13Z
       
  • Revisiting floating bodies
    • Authors: Óscar Ciaurri; Emilio Fernández; Luz Roncal
      Abstract: Publication date: Available online 23 June 2016
      Source:Expositiones Mathematicae
      Author(s): Óscar Ciaurri, Emilio Fernández, Luz Roncal
      The conic sections, as well as the solids obtained by revolving these curves, and many of their surprising properties, were already studied by Greek mathematicians since at least the fourth century B.C. Some of these properties come to the light, or are rediscovered, from time to time. In this paper we characterize the conic sections as the plane curves whose tangent lines cut off from a certain similar curve segments of constant area. We also characterize some quadrics as the surfaces whose tangent planes cut off from a certain similar surface compact sets of constant volume. Our work is developed in the most general multidimensional case.

      PubDate: 2016-07-04T07:34:17Z
      DOI: 10.1016/j.exmath.2016.06.001
       
  • Fibred links in S3
    • Authors: Sebastian Baader; Christian Graf
      Abstract: Publication date: Available online 23 June 2016
      Source:Expositiones Mathematicae
      Author(s): Sebastian Baader, Christian Graf
      We present a simple characterization for Seifert surfaces in S 3 to be fibre surfaces. As an application, we give a short topological proof of the following well-known theorem: A Murasugi sum is a fibre surface if and only if its two summands are.

      PubDate: 2016-07-04T07:34:17Z
       
  • Spectral sequences, exact couples and persistent homology of filtrations
    • Authors: Saugata Basu; Laxmi Parida
      Abstract: Publication date: Available online 23 June 2016
      Source:Expositiones Mathematicae
      Author(s): Saugata Basu, Laxmi Parida
      In this paper we study the relationship between a very classical algebraic object associated to a filtration of topological spaces, namely a spectral sequence introduced by Leray in the 1940’s, and a more recently invented object that has found many applications–namely, its persistent homology groups. We show the existence of a long exact sequence of groups linking these two objects and using it derive formulas expressing the dimensions of each individual groups of one object in terms of the dimensions of the groups in the other object. The main tool used to mediate between these objects is the notion of exact couples first introduced by Massey in 1952.

      PubDate: 2016-07-04T07:34:17Z
      DOI: 10.1016/j.exmath.2016.06.007
       
  • Orthogonality of compact operators
    • Abstract: Publication date: Available online 11 June 2016
      Source:Expositiones Mathematicae
      Author(s): Paweł Wójcik
      In this paper we characterize the Birkhoff—James orthogonality for elements of K ( X ; Y ) . In this way we extend the Bhatia—Šemrl theorem. As an application, we consider the approximate orthogonality preserving property. Moreover, we give a new characterization of inner product spaces.

      PubDate: 2016-06-16T18:02:03Z
       
  • Actions affines isométriques propres des groupes hyperboliques sur
           des espaces ℓp
    • Authors: Aurélien Alvarez; Vincent Lafforgue
      Abstract: Publication date: Available online 11 June 2016
      Source:Expositiones Mathematicae
      Author(s): Aurélien Alvarez, Vincent Lafforgue
      Nous donnons une démonstration élémentaire et relativement courte du fait suivant: tout groupe hyperbolique admet une action affine isométrique propre sur un espace ℓ p pour p suffisamment grand. Une première preuve de ce résultat a été donnée par Yu [22].

      PubDate: 2016-06-16T18:02:03Z
      DOI: 10.1016/j.exmath.2016.06.005
       
  • Semi chaotic operators on Banach spaces
    • Authors: Nareen Bamerni; Adem Kılıçman
      Abstract: Publication date: Available online 11 June 2016
      Source:Expositiones Mathematicae
      Author(s): Nareen Bamerni, Adem Kılıçman
      We introduce and study a weaker form of Devaney chaotic operators on Banach spaces, which we call semi chaotic operators. We show that semi chaotic operators exist on every finite dimensional Hilbert spaces. We give a semi chaotic criterion “a sufficient condition for semi chaotic operators”, we use this criterion to characterize all semi chaotic weighted shifts on ℓ p ( N ) and ℓ p ( Z ) in term of their weight sequences.

      PubDate: 2016-06-16T18:02:03Z
      DOI: 10.1016/j.exmath.2016.06.002
       
  • An example of a space Lp(⋅) on which the Cauchy–Leray–Fantappiè
           operator is not bounded
    • Authors: Alexander Rotkevich
      Abstract: Publication date: Available online 9 June 2016
      Source:Expositiones Mathematicae
      Author(s): Alexander Rotkevich
      We give examples of Lebesgue spaces on which Cauchy and Cauchy–Leray–Fantappiè operators are not bounded.

      PubDate: 2016-06-16T18:02:03Z
       
  • The sensual Apollonian circle packing
    • Authors: Katherine E. Stange
      Abstract: Publication date: Available online 12 January 2016
      Source:Expositiones Mathematicae
      Author(s): Katherine E. Stange
      The curvatures of the circles in integral Apollonian circle packings, named for Apollonius of Perga (262-190 BC), form an infinite collection of integers whose Diophantine properties have recently seen a surge in interest. Here, we give a new description of Apollonian circle packings built upon the study of the collection of bases of Z [ i ] 2 , inspired by, and intimately related to, the ‘sensual quadratic form’ of Conway.

      PubDate: 2016-01-13T16:09:26Z
      DOI: 10.1016/j.exmath.2016.01.001
       
  • Traces on group C∗-algebras, sofic groups and Lück’s
           conjecture
    • Authors: Balci Georges; Skandalis
      Abstract: Publication date: Available online 2 January 2016
      Source:Expositiones Mathematicae
      Author(s): Gül Balci, Georges Skandalis
      We give a reformulation of the proof of a Theorem of Elek and Szabo establishing Lück’s determinant conjecture for sofic groups. It is based on traces on free group C ∗ -algebras. We briefly discuss the relation with Atiyah’s problem on the integrality of L 2 -Betti numbers.

      PubDate: 2016-01-05T12:03:23Z
       
  • Complex phase space and Weyl’s commutation relations
    • Authors: Sergio Albeverio; Ambar Sengupta
      Abstract: Publication date: Available online 31 December 2015
      Source:Expositiones Mathematicae
      Author(s): Sergio Albeverio, Ambar N. Sengupta
      We revisit von Neumann’s determination of the representations of the canonical commutation relations in Weyl form. We present an exposition of the original insights set within the convenient notational framework of symplectic structures. We study von Neumann’s projection operator and show how the complex phase space representation arises.

      PubDate: 2016-01-01T10:28:09Z
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
Home (Search)
Subjects A-Z
Publishers A-Z
Customise
APIs
Your IP address: 54.145.198.123
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2016