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  Subjects -> MATHEMATICS (Total: 889 journals)
    - APPLIED MATHEMATICS (73 journals)
    - GEOMETRY AND TOPOLOGY (20 journals)
    - MATHEMATICS (658 journals)
    - MATHEMATICS (GENERAL) (42 journals)
    - NUMERICAL ANALYSIS (19 journals)
    - PROBABILITIES AND MATH STATISTICS (77 journals)

MATHEMATICS (658 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 538 Journals sorted alphabetically
Abakós     Open Access   (Followers: 4)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 3)
Academic Voices : A Multidisciplinary Journal     Open Access   (Followers: 2)
Accounting Perspectives     Full-text available via subscription   (Followers: 7)
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: 25)
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: 6)
Acta Mathematica Vietnamica     Hybrid Journal  
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal  
Advanced Science Letters     Full-text available via subscription   (Followers: 9)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15)
Advances in Decision Sciences     Open Access   (Followers: 5)
Advances in Difference Equations     Open Access   (Followers: 2)
Advances in Fixed Point Theory     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Linear Algebra & Matrix Theory     Open Access   (Followers: 2)
Advances in Materials Sciences     Open Access   (Followers: 16)
Advances in Mathematical Physics     Open Access   (Followers: 5)
Advances in Mathematics     Full-text available via subscription   (Followers: 10)
Advances in Numerical Analysis     Open Access   (Followers: 4)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Pure and Applied Mathematics     Hybrid Journal   (Followers: 6)
Advances in Pure Mathematics     Open Access   (Followers: 4)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 5)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
Afrika Matematika     Hybrid Journal   (Followers: 1)
Air, Soil & Water Research     Open Access   (Followers: 9)
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 1)
Al-Jabar : Jurnal Pendidikan Matematika     Open Access  
Algebra and Logic     Hybrid Journal   (Followers: 4)
Algebra Colloquium     Hybrid Journal   (Followers: 4)
Algebra Universalis     Hybrid Journal   (Followers: 2)
Algorithmic Operations Research     Full-text available via subscription   (Followers: 5)
Algorithms     Open Access   (Followers: 11)
Algorithms Research     Open Access   (Followers: 1)
American Journal of Biostatistics     Open Access   (Followers: 9)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 4)
American Journal of Mathematical Analysis     Open Access  
American Journal of Mathematics     Full-text available via subscription   (Followers: 7)
American Journal of Operations Research     Open Access   (Followers: 5)
American Mathematical Monthly     Full-text available via subscription   (Followers: 6)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 7)
Analele Universitatii Ovidius Constanta - Seria Matematica     Open Access   (Followers: 1)
Analysis     Hybrid Journal   (Followers: 2)
Analysis and Applications     Hybrid Journal   (Followers: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 3)
Analysis Mathematica     Full-text available via subscription  
Annales Mathematicae Silesianae     Open Access  
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annales UMCS, Mathematica     Open Access   (Followers: 1)
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica     Open Access  
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 11)
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: 7)
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   (Followers: 1)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arab Journal of Mathematical Sciences     Open Access   (Followers: 3)
Arabian Journal of Mathematics     Open Access   (Followers: 2)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
Arnold Mathematical Journal     Hybrid Journal   (Followers: 1)
Artificial Satellites : The Journal of Space Research Centre of Polish Academy of Sciences     Open Access   (Followers: 20)
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: 3)
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   (Followers: 2)
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: 9)
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: 20)
Carpathian Mathematical Publications     Open Access   (Followers: 1)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 1)
CHANCE     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
ChemSusChem     Hybrid Journal   (Followers: 7)
Chinese Annals of Mathematics, Series B     Hybrid Journal  
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Mathematics     Open Access  
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Cogent Mathematics     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Collectanea Mathematica     Hybrid Journal  
College Mathematics Journal     Full-text available via subscription   (Followers: 3)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Commentarii Mathematici Helvetici     Hybrid Journal   (Followers: 1)
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 1)
Communications On Pure & Applied Mathematics     Hybrid Journal   (Followers: 3)
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Complex Variables and Elliptic Equations: An International Journal     Hybrid Journal  
Complexus     Full-text available via subscription  
Composite Materials Series     Full-text available via subscription   (Followers: 9)
Comptes Rendus Mathematique     Full-text available via subscription   (Followers: 1)
Computational and Applied Mathematics     Hybrid Journal   (Followers: 2)
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 4)
Computational Methods and Function Theory     Hybrid Journal  
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 6)
Concrete Operators     Open Access   (Followers: 4)
Confluentes Mathematici     Hybrid Journal  
COSMOS     Hybrid Journal  
Cryptography and Communications     Hybrid Journal   (Followers: 14)
Cuadernos de Investigación y Formación en Educación Matemática     Open Access  
Cubo. A Mathematical Journal     Open Access  
Czechoslovak Mathematical Journal     Hybrid Journal   (Followers: 1)
Demographic Research     Open Access   (Followers: 11)
Demonstratio Mathematica     Open Access  
Dependence Modeling     Open Access  
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 28)
Developments in Clay Science     Full-text available via subscription   (Followers: 1)
Developments in Mineral Processing     Full-text available via subscription   (Followers: 3)
Dhaka University Journal of Science     Open Access  
Differential Equations and Dynamical Systems     Hybrid Journal   (Followers: 3)
Discrete Mathematics     Hybrid Journal   (Followers: 8)
Discrete Mathematics & Theoretical Computer Science     Open Access  
Discrete Mathematics, Algorithms and Applications     Hybrid Journal   (Followers: 2)
Discussiones Mathematicae Graph Theory     Open Access   (Followers: 1)
Dnipropetrovsk University Mathematics Bulletin     Open Access  
Doklady Mathematics     Hybrid Journal  
Duke Mathematical Journal     Full-text available via subscription   (Followers: 1)
Eco Matemático     Open Access  
Edited Series on Advances in Nonlinear Science and Complexity     Full-text available via subscription  
Electronic Journal of Differential Equations     Open Access  
Electronic Journal of Graph Theory and Applications     Open Access   (Followers: 2)
Electronic Notes in Discrete Mathematics     Full-text available via subscription   (Followers: 2)
Elemente der Mathematik     Full-text available via subscription   (Followers: 3)
Energy for Sustainable Development     Hybrid Journal   (Followers: 9)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Ensino da Matemática em Debate     Open Access  
Entropy     Open Access   (Followers: 5)
ESAIM: Control Optimisation and Calculus of Variations     Full-text available via subscription   (Followers: 1)
European Journal of Combinatorics     Full-text available via subscription   (Followers: 5)
European Journal of Mathematics     Hybrid Journal   (Followers: 1)
European Scientific Journal     Open Access   (Followers: 2)
Experimental Mathematics     Hybrid Journal   (Followers: 4)
Expositiones Mathematicae     Hybrid Journal   (Followers: 2)
Facta Universitatis, Series : Mathematics and Informatics     Open Access  
Fasciculi Mathematici     Open Access  

        1 2 3 4 | Last

Journal Cover Bulletin of the Brazilian Mathematical Society, New Series
  [SJR: 0.436]   [H-I: 19]   [0 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1678-7544 - ISSN (Online) 1678-7714
   Published by Springer-Verlag Homepage  [2354 journals]
  • Well-Posedness Results and Dissipative Limit of High Dimensional KdV-Type
           Equations
    • Authors: Xavier Carvajal; Amin Esfahani; Mahendra Panthee
      Pages: 505 - 550
      Abstract: Considered in this work is an n-dimensional dissipative version of the Korteweg–de Vries (KdV) equation. Our goal here is to investigate the well-posedness issue for the associated initial value problem in the anisotropic Sobolev spaces. We also study well-posedness behavior of this equation when the dissipative effects are reduced.
      PubDate: 2017-12-01
      DOI: 10.1007/s00574-017-0034-z
      Issue No: Vol. 48, No. 4 (2017)
       
  • Induced Hausdorff Metrics on Quotient Spaces
    • Authors: Ryuichi Fukuoka; Djeison Benetti
      Pages: 551 - 598
      Abstract: Let G be a group, (M, d) be a metric space, \(X\subset M\) be a compact subset and \(\varphi :G\times M\rightarrow M\) be a left action of G on M by homeomorphisms. Denote \(gp=\varphi (g,p)\) . The isotropy subgroup of G with respect to X is defined by \(H_X=\{g\in G; gX=X\}\) . In this work we define the induced Hausdorff metric on \(G/H_X\) by \(d_X(g_1H_X,g_2H_X):=d_H(g_1X,g_2X)\) , where \(d_H\) is the Hausdorff distance on M. Let \(\hat{d}_X\) be the intrinsic metric induced by \(d_X\) . In this work, we study the geometry of \((G/H_X,d_X)\) and \((G/H_X,\hat{d}_X)\) and their relationship with (M, d). In particular, we prove that if G is a Lie group, M is a differentiable manifold endowed with a metric which is locally Lipschitz equivalent to a Finsler metric, \(X\subset M\) is a compact subset and \(\varphi :G\times M\rightarrow M\) is a smooth left action by isometries, then \((G/H_X,\hat{d}_X)\) is a \(C^0\) -Finsler manifold. We also calculate the Finsler metric explicitly in some examples.
      PubDate: 2017-12-01
      DOI: 10.1007/s00574-017-0032-1
      Issue No: Vol. 48, No. 4 (2017)
       
  • Properties of Shadowable Points: Chaos and Equicontinuity
    • Authors: Noriaki Kawaguchi
      Pages: 599 - 622
      Abstract: We extend the study on shadowable points recently introduced by Morales in relation to chaotic or non-chaotic properties. Firstly, some sufficient conditions for a quantitative shadowable point to be approximated by an entropy point are given. As a corollary, we get different three chaotic conditions from which a shadowable point becomes an entropy point. Secondly, we provide a dichotomy on the interior of the set of shadowable chain recurrent points by two canonical chaotic and non-chaotic dynamics, the full shift and odometers.
      PubDate: 2017-12-01
      DOI: 10.1007/s00574-017-0033-0
      Issue No: Vol. 48, No. 4 (2017)
       
  • Classification of Jets of Surfaces in Projective 3-Space Via Central
           Projection
    • Authors: H. Sano; Y. Kabata; J. L. Deolindo Silva; T. Ohmoto
      Pages: 623 - 639
      Abstract: We present a local classification of smooth surfaces in \({\mathbb {P}}^3\) in terms of the singularity types (of codimension \(\le \) 4) of their central projections to a plane. Based on our classification result, we also give exact normal forms to surface germs at transition moments on bifurcations with respect to parabolic curves and flecnodal curves.
      PubDate: 2017-12-01
      DOI: 10.1007/s00574-017-0036-x
      Issue No: Vol. 48, No. 4 (2017)
       
  • On Classical Uniformization Theorems for Higher Dimensional Complex
           Kleinian Groups
    • Authors: Angel Cano; Luis Loeza; Alejandro Ucan-Puc
      Pages: 641 - 647
      Abstract: In this article we show that Bers’ simultaneous uniformization and Köebe’s retrosection theorem do not hold for discrete groups of projective transformations acting on complex projective space.
      PubDate: 2017-12-01
      DOI: 10.1007/s00574-017-0035-y
      Issue No: Vol. 48, No. 4 (2017)
       
  • On the $$\mathcal {K}^*$$ K ∗ -Expansiveness of the Rovella Attractor
    • Authors: Dante Carrasco-Olivera; Bernardo San Martín
      Pages: 649 - 662
      Abstract: It is well known that the geometric Lorenz attractor is \(\mathcal {K}^*\) -expansive. In this paper we prove that the Rovella attractor is also \(\mathcal {K}^*\) -expansive in an almost 2-persistent way.
      PubDate: 2017-12-01
      DOI: 10.1007/s00574-017-0038-8
      Issue No: Vol. 48, No. 4 (2017)
       
  • Well-Posedness of the Stochastic Transport Equation with Unbounded Drift
    • Authors: David A. C. Mollinedo; Christian Olivera
      Pages: 663 - 677
      Abstract: The Cauchy problem for a multidimensional linear transport equation with unbounded drift is investigated. Provided the drift is Holder continuous , existence, uniqueness and strong stability of solutions are obtained. The proofs are based on a careful analysis of the associated stochastic flow of characteristics and techniques of stochastic analysis.
      PubDate: 2017-12-01
      DOI: 10.1007/s00574-017-0039-7
      Issue No: Vol. 48, No. 4 (2017)
       
  • On Umbilic Points on Newly Born Surfaces
    • Authors: Masaru Hasegawa; Farid Tari
      Pages: 679 - 696
      Abstract: The simplest way to have birth of surfaces is through transitions in the fibres of a function f with a Morse singularity of index 0 or 3. It is natural to seek to understand the geometry of newly born surfaces. We consider here the question of finding how many umbilics are on a newly born surface. We show that newly born surfaces in the Euclidean 3-space have exactly 4 umbilic points all of type lemon, provided that the Hessian of f at the singular point has pairwise distinct eigenvalues. This is true in both cases when f is an analytic or a smooth germ. When only two of such eigenvalues are equal, the number of umbilic points is either 2, 4, 6 or 8 when f is an analytic or a generic smooth germ. The same results holds for newly born surfaces in the Minkowski 3-space. In that case when the two eigenvalues associated to the two spacelike eigenvectors are distinct we get exactly 4 umbilic points all of type lemon. If they are equal, the number of umbilic points is either 2, 4, 6 or 8.
      PubDate: 2017-12-01
      DOI: 10.1007/s00574-017-0037-9
      Issue No: Vol. 48, No. 4 (2017)
       
  • On the Angle of Complete Hypersurfaces in Semi-Riemannian Product Spaces
    • Authors: Cícero Aquino; Halyson Baltazar
      Pages: 697 - 715
      Abstract: The purpose of this article is to study the uniqueness of complete hypersurfaces satisfying some pinching curvature condition. Here, we use the generalized maximum principle of Omori–Yau to obtain uniqueness results for complete spacelike hypersurfaces immersed in a Lorentzian product space. In addition, we obtain the analogue results for complete hypersurfaces immersed in a Riemannian product space.
      PubDate: 2017-12-01
      DOI: 10.1007/s00574-017-0041-0
      Issue No: Vol. 48, No. 4 (2017)
       
  • On $$\mathbb {P}$$ P -Weakly Hyperbolic Iterated Function Systems
    • Authors: Ítalo Melo
      Pages: 717 - 732
      Abstract: In this paper we will consider the concept of \(\mathbb {P}\) -weakly hyperbolic iterated function systems on compact metric spaces that generalizes the concept of weakly hyperbolic iterated function systems, as defined by Edalat (Inf Comput 124(2):182–197, 1996) and by Arbieto, Santiago and Junqueira (Bull Braz Math Soc New Ser 2016) for a more general setting where the parameter space is a compact metric space. We prove the existence and uniqueness of the invariant measure of a \(\mathbb {P}\) -weakly hyperbolic IFS. Furthermore, we prove an ergodic theorem for \(\mathbb {P}\) -weakly hyperbolic IFS with compact parameter space.
      PubDate: 2017-12-01
      DOI: 10.1007/s00574-017-0042-z
      Issue No: Vol. 48, No. 4 (2017)
       
  • Isotrivial Unfoldings and Structural Theorems for Foliations on Projective
           Spaces
    • Authors: Federico Quallbrunn
      Pages: 335 - 345
      Abstract: Following Suwa, we study unfoldings of algebraic foliations and their relationship with families of foliations, making focus on those unfoldings related to trivial families. The results obtained in the study of unfoldings are then applied to obtain information on the structure of foliations on projective spaces.
      PubDate: 2017-09-01
      DOI: 10.1007/s00574-016-0024-6
      Issue No: Vol. 48, No. 3 (2017)
       
  • On Equilibrium States for Partially Hyperbolic Horseshoes: Uniqueness and
           Statistical Properties
    • Authors: V. Ramos; J. Siqueira
      Pages: 347 - 375
      Abstract: We prove uniqueness of equilibrium states for a family of partially hyperbolic horseshoes associated to a class of Hölder continuous potentials with small variation and derive statistical properties for this unique equilibrium. We define a projection map associated to the horseshoe and prove a spectral gap for its transfer operator acting on some space of Hölder continuous observables. From this we deduce an exponential decay of correlations and a central limit theorem. We finally extend these results to the horseshoe via Rohlin’s disintegration of the equilibrium along the stable fibers.
      PubDate: 2017-09-01
      DOI: 10.1007/s00574-017-0027-y
      Issue No: Vol. 48, No. 3 (2017)
       
  • Burnside Problem for Groups of Homeomorphisms of Compact Surfaces
    • Authors: Nancy Guelman; Isabelle Liousse
      Pages: 389 - 397
      Abstract: A group \(\Gamma \) is said to be periodic if for any g in \(\Gamma \) there is a positive integer n with \(g^n=id\) . We first prove that a finitely generated periodic group acting on the 2-sphere \({\mathbb S}^2\) by \(C^1\) -diffeomorphisms with a finite orbit, is finite and \(C^1\) -conjugate to a subgroup of \(\mathrm {O}(3,{\mathbb R})\) . This result is obtained by proving the more general statement: a finitely generated periodic group acting on any compact manifold by \(C^1\) -diffeomorphisms with a finite orbit, is finite. We use it for proving that a countable 2-group of spherical diffeomorphisms with bounded orders is finite. This gives a negative partial answer to a question posed by D. Fisher. Finally, we show that a finitely generated periodic group of homeomorphisms of any orientable compact surface other than the 2-sphere or the 2-torus is finite.
      PubDate: 2017-09-01
      DOI: 10.1007/s00574-017-0028-x
      Issue No: Vol. 48, No. 3 (2017)
       
  • Identities for Partitions Generated by the Unsigned Versions of Some Mock
           Theta Functions
    • Authors: A. Bagatini; M. L. Matte; A. Wagner
      Pages: 413 - 437
      Abstract: Considering the unsigned version of the mock theta functions \(\phi (q)\) , \(\psi (q)\) , \(f_0(q)\) , \(F_0(q)\) , \(f_1(q)\) and \(F_1(q),\) they represent partitions subject to some rules. Based on a two-line matrix representation, we can classify them according to the sum of second line and derive some results such as closed formulas and identities for other types of partitions.
      PubDate: 2017-09-01
      DOI: 10.1007/s00574-016-0021-9
      Issue No: Vol. 48, No. 3 (2017)
       
  • On the Structure of the Equivalent Differential Systems and their
           Reflecting Integrals
    • Authors: Zhengxin Zhou
      Pages: 439 - 447
      Abstract: In this article, I have completely solved this problem: when one differential system is equivalent to a given differential system, what structure does this system and its reflecting integral have' At the same time, I have established the relationship between the reflecting integrals and the first integrals and integrating factors of the differential equations.
      PubDate: 2017-09-01
      DOI: 10.1007/s00574-016-0026-4
      Issue No: Vol. 48, No. 3 (2017)
       
  • The Reeb Graph of a Map Germ from $$\mathbb {R}^3$$ R 3 to $$\mathbb
           {R}^2$$ R 2 with Non Isolated Zeros
    • Authors: Erica Boizan Batista; João Carlos Ferreira Costa; Juan J. Nuño-Ballesteros
      Abstract: We consider the topological classification of finitely determined map germs \([f]:(\mathbb {R}^3,0)\rightarrow (\mathbb {R}^2,0)\) with \(f^{-1}(0)\ne \{0\}\) . The case \(f^{-1}(0) = \{0\}\) was treated in another recent paper by the authors. The main tool used to describe the topological type is the link of [f], which is obtained by taking the intersection of its image with a small sphere \(S^1_\delta \) centered at the origin. The link is a stable map \(\gamma _f:N\rightarrow S^1\) , where N is diffeomorphic to a sphere \(S^2\) minus 2L disks. We define a complete topological invariant called the generalized Reeb graph. Finally, we apply our results to give a topological description of some map germs with Boardman symbol \(\Sigma ^{2,1}\) .
      PubDate: 2017-11-16
      DOI: 10.1007/s00574-017-0058-4
       
  • Hypercontractivity Property and General Optimal $$L^p$$ L p -Entropy
           Inequalities on Riemannian Manifolds
    • Authors: Marcos Teixeira Alves; Jurandir Ceccon; Higidio Portillo Oquendo
      Abstract: Let (M, g) be a n-dimensional smooth compact Riemannian manifold without boundary with \(n\ge 2\) . We prove that the optimal Riemannian p-entropy inequality $$\begin{aligned} \int _M u ^p\log ( u ^p) \; dv_g\le \dfrac{n}{\tau }\log \left[ {\mathcal {A}}(p,\tau )\left( \int _M \nabla _g u ^p\; dv_g\right) ^{\frac{\tau }{p}}+{\mathcal {B}}(p)\right] \end{aligned}$$ is valid for every \(u\in H^{1,p}(M)\) with \(\Vert u\Vert _p=1\) where \(p>1\) and \(1\le \tau < \min \{2,p\}\) or \(\tau = p \le 2\) . Also, we investigated the relationship between this optimal inequality and the hypercontractivity property for the non-linear evolution equation $$\begin{aligned} u_t=\Delta _p\left( u^{\frac{1}{p-1}}\right) ,\quad x\in M,\ t>0. \end{aligned}$$ When \(\tau =p\le 2\) we find explicit estimates of the time asymptotic behavior of their solutions with initial data in the spaces \(L^q(M)\) , \(1\le q<\infty \) .
      PubDate: 2017-11-04
      DOI: 10.1007/s00574-017-0057-5
       
  • Haar Wavelet Methods for Numerical Solutions of Harry Dym (HD), BBM
           Burger’s and 2 D Diffusion Equations
    • Authors: Inderdeep Singh; Sheo Kumar
      Abstract: Solutions of partial differential equations which are not enough smooth, when approximated by cubic, quadratic and linear polynomials results in poor convergence or no convergence in results. In such cases, approximation by zero degree polynomials like Haar wavelets (continuous functions with finite jumps) are more suitable and successful. In view of the above, numerical methods based on Haar wavelet are developed for solving third-order Harry Dym (HD), Benjamin–Bona–Mahony–Burger’s (BBM Burger’s) equation and 2D diffusion equation. Numerical examples have been solved to establish that the present methods give better results than the numerical methods described in past literature.
      PubDate: 2017-11-02
      DOI: 10.1007/s00574-017-0055-7
       
  • Harnack’s Inequality and Applications of Quasilinear Degenerate Elliptic
           Equations with Rough and Singular Coefficients
    • Authors: Pengcheng Niu; Leyun Wu
      Abstract: We consider the quasilinear degenerate elliptic equation with rough and singular coefficients of the form $$\begin{aligned} div\left( {A(x,u,\nabla u)} \right) = B(x,u,\nabla u) \end{aligned}$$ in an open set \(\Omega \subset {\mathbb {R}^n},\) where the quadratic form associated with the principle part of this equation allows vanishing and the coefficients in structural conditions on \(A(x,u,\nabla u)\) and \(B(x,u,\nabla u)\) require no smoothness but belong to some Stummel–Kato class. We prove a Fefferman–Phong type inequality related to the Stummel–Kato class and then an embedding inequality. Based on these inequalities, the local boundedness and Harnack’s inequality of the weak solutions are derived. As applications, the continuity and Hölder continuity for the nonnegative weak solutions are given.
      PubDate: 2017-10-09
      DOI: 10.1007/s00574-017-0054-8
       
  • Duality of the Kulkarni Limit Set for Subgroups of $$\text {PSL}(3,\mathbb
           {C})$$ PSL ( 3 , C )
    • Authors: Waldemar Barrera; Adriana Gonzalez-Urquiza; Juan Pablo Navarrete
      Abstract: In this paper we give a generalization of the Conze–Guivarc’h limit set. With this definition the limit set has very similar properties to those of the limit set in hyperbolic spaces. Moreover, we prove a relation between this new limit set and the Kulkarni limit set. Additionally we show that some closed subsets can be approximated by the Conze–Guivarc’h limit set. This is a result in the theory of classic Kleinian groups.
      PubDate: 2017-09-02
      DOI: 10.1007/s00574-017-0053-9
       
 
 
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