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MATHEMATICS (701 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: 3)
ACM Transactions on Mathematical Software (TOMS)     Hybrid Journal   (Followers: 6)
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 27)
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: 6)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 18)
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: 13)
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: 12)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Pure and Applied Mathematics     Hybrid Journal   (Followers: 6)
Advances in Pure Mathematics     Open Access   (Followers: 5)
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: 10)
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 Computational and Applied Mathematics     Open Access   (Followers: 5)
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: 7)
An International Journal of Optimization and Control: Theories & Applications     Open Access   (Followers: 8)
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: 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: 12)
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)
ANZIAM Journal     Open Access   (Followers: 1)
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: 6)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 6)
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: 5)
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: 5)
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: 21)
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: 4)
Australian Senior Mathematics Journal     Full-text available via subscription   (Followers: 1)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Axioms     Open Access   (Followers: 1)
Baltic International Yearbook of Cognition, Logic and Communication     Open Access   (Followers: 1)
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: 11)
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 Symbolic Logic     Full-text available via subscription   (Followers: 3)
Bulletin of the Australian Mathematical Society     Full-text available via subscription   (Followers: 1)
Bulletin of the Brazilian Mathematical Society, New Series     Hybrid Journal  
Bulletin of the London Mathematical Society     Hybrid Journal   (Followers: 4)
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: 2)
CHANCE     Hybrid Journal   (Followers: 6)
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  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Commentarii Mathematici Helvetici     Hybrid Journal   (Followers: 1)
Communications in Combinatorics and Optimization     Open Access  
Communications in Contemporary Mathematics     Hybrid Journal  
Communications in Mathematical Physics     Hybrid Journal   (Followers: 2)
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)
Compositio Mathematica     Full-text available via subscription   (Followers: 1)
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: 5)
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: 7)
Concrete Operators     Open Access   (Followers: 4)
Confluentes Mathematici     Hybrid Journal  
Contributions to Game Theory and Management     Open Access  
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  
Current Research in Biostatistics     Open Access   (Followers: 10)
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)
Differentsial'nye Uravneniya     Open Access  
Discrete Mathematics     Hybrid Journal   (Followers: 8)
Discrete Mathematics & Theoretical Computer Science     Open Access  
Discrete Mathematics, Algorithms and Applications     Hybrid Journal   (Followers: 2)
Discussiones Mathematicae - General Algebra and Applications     Open Access  
Discussiones Mathematicae Graph Theory     Open Access   (Followers: 1)
Diskretnaya Matematika     Full-text available via subscription  
Dnipropetrovsk University Mathematics Bulletin     Open Access  
Doklady Akademii Nauk     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: 4)
Energy for Sustainable Development     Hybrid Journal   (Followers: 9)

        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  [2351 journals]
  • Geometric Growth for Anosov Maps on the 3 Torus
    • Authors: Mauricio Poletti
      Abstract: We prove that for Anosov maps of the 3-torus if the Lyapunov exponents of absolutely continuous measures in every direction are equal to the geometric growth of the invariant foliations then f is \(C^1\) conjugated to its linear part.
      PubDate: 2018-02-26
      DOI: 10.1007/s00574-018-0079-7
  • A Generalization for a Finite Family of Functions of the Converse of
           Browder’s Fixed Point Theorem
    • Authors: Radu Miculescu; Alexandru Mihail
      Abstract: Taking as model the attractor of an iterated function system consisting of \(\varphi \) -contractions on a complete and bounded metric space, we introduce the set-theoretic concept of family of functions having attractor. We prove that, given such a family, there exist a metric on the set on which the functions are defined and take values and a comparison function \(\varphi \) such that all the family’s functions are \(\varphi \) -contractions. In this way we obtain a generalization for a finite family of functions of the converse of Browder’s fixed point theorem. As byproducts we get a particular case of Bessaga’s theorem concerning the converse of the contraction principle and a companion of Wong’s result which extends the above mentioned Bessaga’s result for a finite family of commuting functions with common fixed point.
      PubDate: 2018-02-26
      DOI: 10.1007/s00574-018-0076-x
  • New Henry–Gronwall Integral Inequalities and Their Applications to
           Fractional Differential Equations
    • Authors: Tao Zhu
      Abstract: Some new Henry–Gronwall integral inequalities are established, which generalize some former famous inequalities and can be used as powerful tools in the study of differential and integral equations.
      PubDate: 2018-02-17
      DOI: 10.1007/s00574-018-0074-z
  • Synchronization in Minimal Iterated Function Systems on Compact Manifolds
    • Authors: Ale Jan Homburg
      Abstract: We treat synchronization for iterated function systems generated by diffeomorphisms on compact manifolds. Synchronization here means the convergence of orbits starting at different initial conditions when iterated by the same sequence of diffeomorphisms. The iterated function systems admit a description as skew product systems of diffeomorphisms on compact manifolds driven by shift operators. Under open conditions including transitivity and negative fiber Lyapunov exponents, we prove the existence of a unique attracting invariant graph for the skew product system. This explains the occurrence of synchronization. The result extends previous results for iterated function systems by diffeomorphisms on the circle, to arbitrary compact manifolds.
      PubDate: 2018-01-31
      DOI: 10.1007/s00574-018-0073-0
  • The Ribaucour Transformation for Hypersurfaces of Two Space Forms and
           Conformally Flat Hypersurfaces
    • Authors: R. Tojeiro; S. Canevari
      Abstract: We develop a Ribaucour transformation for the class of conformally flat hypersurfaces \(f:M^{3} \rightarrow \mathbb {Q}_s^{4}(c)\) with three distinct principal curvatures of a pseudo-Riemannian space form of dimension 4, constant curvature c and index \(s\in \{0, 1\}\) , as well as for the class of hypersurfaces \(f:M^{3} \rightarrow \mathbb {Q}_s^{4}(c)\) with three distinct principal curvatures for which there exists another isometric immersion \(\tilde{f}:M^{3} \rightarrow \mathbb {Q}^{4}_{\tilde{s}}(\tilde{c})\) with \(\tilde{c}\ne c\) . It gives a process to produce a family of new elements of those classes starting from a given one and a solution of a linear system of PDE’s. This enables us to construct explicit new examples of hypersurfaces in both classes.
      PubDate: 2018-01-31
      DOI: 10.1007/s00574-018-0072-1
  • On the Number of Cyclic Subgroups of a Finite Group
    • Authors: Martino Garonzi; Igor Lima
      Abstract: Let G be a finite group and let c(G) be the number of cyclic subgroups of G. We study the function \(\alpha (G) = c(G)/ G \) . We explore its basic properties and we point out a connection with the probability of commutation. For many families \(\mathscr {F}\) of groups we characterize the groups \(G \in \mathscr {F}\) for which \(\alpha (G)\) is maximal and we classify the groups G for which \(\alpha (G) > 3/4\) . We also study the number of cyclic subgroups of a direct power of a given group deducing an asymptotic result and we characterize the equality \(\alpha (G) = \alpha (G/N)\) when G / N is a symmetric group.
      PubDate: 2018-01-30
      DOI: 10.1007/s00574-018-0068-x
  • Abel Maps and Limit Linear Series for Curves of Compact Type with Three
           Irreducible Components
    • Authors: Gabriel Muñoz
      Abstract: We explore the relationship between limit linear series and fibers of Abel maps for compact type curves with three components. For compact type curves with two components, given an exact Osserman limit linear series \({\mathfrak {g}}\) , Esteves and Osserman associated a closed subscheme \({\mathbb {P}}({\mathfrak {g}})\) of the fiber of the corresponding Abel map. We generalize this definition to our case. Then, for \({\mathfrak {g}}\) the unique exact extension of an r-dimensional refined Eisenbud–Harris limit linear series, we find the irreducible components of \({\mathbb {P}}({\mathfrak {g}})\) and we show that \({\mathbb {P}}({\mathfrak {g}})\) is connected of pure dimension r, with the same Hilbert polynomial as the diagonal in \({\mathbb {P}}^{r}\times {\mathbb {P}}^{r}\times {\mathbb {P}}^{r}\) .
      PubDate: 2018-01-15
      DOI: 10.1007/s00574-018-0071-2
  • Flow and Heat Transfer of a Second Grade Fluid Between Two Stretchable
           Rotating Disks
    • Authors: Abhijit Das; Bikash Sahoo
      Abstract: The steady laminar flow and heat transfer of a non-Newtonian second grade fluid between two stretchable, co-axially rotating disks is considered. Using similarity transformations, partial differential equations governing the flow, are reduced to a set of highly coupled and nonlinear ordinary differential equations. These developed nonlinear equations are then integrated analytically using an effective analytical method called homotopy analysis method to obtain series solutions. The convergence of the obtained series solutions are also analyzed. Results obtained using 20th-order homotopy approximations, for different cases, such as the disks rotating in same (opposite) sense with same (different) angular velocities are shown graphically and discussed in detail for various parameters of interest, such as, stretching parameter, Reynolds number, non-Newtonian viscoelastic parameter. Of particular interest are the values of \(F''(0)\) and \(-G'(0)\) . And \(-G'(0)\) found to be decreasing function of the non-Newtonian viscoelastic parameter K whereas the values of \(F''(0)\) decreases with K, except when both the disk stretches and \(\Omega =0, 0.5\) .
      PubDate: 2018-01-12
      DOI: 10.1007/s00574-018-0069-9
  • Solving an Abstract Nonlinear Eigenvalue Problem by the Inverse Iteration
    • Authors: Grey Ercole
      Abstract: Let \(\left( X,\left\ \cdot \right\ _{X}\right) \) and \(\left( Y,\left\ \cdot \right\ _{Y}\right) \) be Banach spaces over \(\mathbb {R},\) with X uniformly convex and compactly embedded into Y. The inverse iteration method is applied to solve the abstract eigenvalue problem \(A(w)=\lambda \left\ w\right\ _{Y}^{p-q}B(w),\) where the maps \(A:X\rightarrow X^{\star }\) and \(B:Y\rightarrow Y^{\star }\) are homogeneous of degrees \(p-1\) and \(q-1,\) respectively.
      PubDate: 2018-01-10
      DOI: 10.1007/s00574-018-0070-3
  • Well-Posedness Results and Dissipative Limit of High Dimensional KdV-Type
    • 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)
  • Classification of Jets of Surfaces in Projective 3-Space Via Central
    • 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 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)
  • Capillary Immersions in $$\mathbb {E}(\kappa , \tau )$$ E ( κ , τ )
    • Authors: Haimer A. Trejos
      Abstract: In Aledo et al. (Adv Math 224:2511–2530, 2010) and Espinar and Trejos (The Abresch–Rosenberg Shape Operator and Applications. arXiv:1512.02099, 2015) the authors showed the existence of a Codazzi pair defined on any constant mean curvature surface in the homogeneous spaces \(\mathbb {E}(\kappa , \tau )\) associated to the Abresch–Rosenberg differential. In this paper, we use the mentioned Codazzi pair to classify capillary disks in \(\mathbb {E}(\kappa , \tau )\) . As a consequence, the results presented in this paper generalize the previous classification of constant mean curvature disks in the product spaces \(\mathbb {S}^{2} \times \mathbb {R}\) and \(\mathbb {H}^{2} \times \mathbb {R}\) in do Carmo and Fernández (Forum Math 21:951–963, 2009) and Cavalcante and Lira (Mich Math J 55:163–181, 2007).
      PubDate: 2017-12-20
      DOI: 10.1007/s00574-017-0063-7
  • The Bi-Lipschitz Equisingularity of Essentially Isolated Determinantal
    • Authors: Thiago F. da Silva; Nivaldo G. Grulha; Miriam S. Pereira
      Abstract: The Bi-Lipschitz geometry is one of the main subjects in the modern approach of singularity theory. However, it rises from works of important mathematicians of the last century, especially Zariski. In this work we investigate the Bi-Lipschitz equisingularity of families of essentially isolated determinantal singularities inspired by the approach of Mostowski and Gaffney.
      PubDate: 2017-12-16
      DOI: 10.1007/s00574-017-0067-3
  • Compact CMC Graphs in $$M\times \mathbb {R}$$ M × R with Boundary in Two
           Horizontal Slices
    • Authors: A. Aiolfi; G. Nunes; L. Sauer; R. Soares
      Abstract: We establish existence and uniqueness of compact graphs of cons tant mean curvature in \(M\times \mathbb {R}\) , over bounded domains contained in \(M\times \left\{ 0\right\} \) , with boundary lying in two horizontal slices of \(M\times \mathbb {R}\) .
      PubDate: 2017-12-11
      DOI: 10.1007/s00574-017-0064-6
  • L-stable Groups of Complex Diffeomorphisms with a Fixed Point
    • Authors: M. Martelo; B. Scárdua
      Abstract: We introduce a notion stability for subgroups of local complex analytic diffeomorphisms having a common fixed point, in several complex variables. This notion, called L-stability, is inspired in the notion of stability of Lyapunov for singular points and closed orbits of ordinary differential equations. It is also connected to the notion of stability for a proper leaf of a foliation in the classical sense of Reeb. We first classify in terms of the unitary group. Then we prove analytic linearization for a L-stable map and on the classification of L-stable linear groups. This is related to the study of subgroups of \({\mathbb {U}}(n)\) , the unitary matrix group.
      PubDate: 2017-12-08
      DOI: 10.1007/s00574-017-0062-8
  • A Reilly Inequality for the First Non-zero Eigenvalue of a Class of
           Operators on Riemannian Manifold
    • Authors: Qun Chen; Jianghai Shi
      Abstract: In this paper, we investigate the first non-zero eigenvalue problem of the following operator $$\begin{aligned} \left\{ \begin{array}{l} \mathrm {div} A\nabla {f}\mathrm =0 \quad \hbox {in}\quad \Omega ,\\ \frac{\partial f}{\partial v} =pf\ \quad \hbox {on}\quad \partial \Omega ,\\ \end{array} \right. \end{aligned}$$ where \(\Omega \) is a compact bounded domain in an m-dimensional complete Riemannian manifold \(M^{m}\) , v is the outward unit normal vector field of \(\partial \Omega \) and A is a positive definite symmetric (1,1)-tensor on \(M^{m}\) . By the Rayleigh-Ritz inequality and Hsiung–Minkowski formulas, we derive an upper bound for the first non-zero eigenvalue of these operators on bounded domain of complete manifolds isometrically immersed in a Euclidean space or a unit Sphere in terms of the r-th mean curvatures of its boundary \(\partial \Omega \) .
      PubDate: 2017-12-07
      DOI: 10.1007/s00574-017-0066-4
  • Absolute Continuity and Band Gaps of the Spectrum of the Dirichlet
           Laplacian in Periodic Waveguides
    • Authors: Carlos R. Mamani; Alessandra A. Verri
      Abstract: Consider the Dirichlet Laplacian operator \(-\Delta ^D\) in a periodic waveguide \(\Omega \) . Under the condition that \(\Omega \) is sufficiently thin, we show that its spectrum \(\sigma (-\Delta ^D)\) is absolutely continuous (in each finite region). In addition, we ensure the existence of at least one gap in \(\sigma (-\Delta ^D)\) and locate it.
      PubDate: 2017-12-04
      DOI: 10.1007/s00574-017-0065-5
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