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Browsing Matemáticas by Title

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  • A characterization of equivariant absolute extensors and the equivariant Dugundji theorem
    Antonyan, SA (2005)
    Let G be a compact Lie group. We prove that a metrizable G-space X is a G-ANE (resp., a G-AE) iff X is an ANE (resp., an AE) and, for any closed subgroup H C G, the H-fixed point set X[H] is a strong neighborhood H-deformation ...
  • Cheeger's constant in balls and isoperimetric inequality on Riemannian manifolds
    Unknown author (2008)
    We prove isoperimetric inequality on a Riemannian manifold, assuming that the Cheeger constant for balls satisfies a certain estimation.
  • Closed principal lines of surfaces immersed in the Euclidean 4-space
    García, RA; Sánchez-Bringas, F (2002)
    In this paper, nu-principal cycles of surfaces immersed in R-4 are studied. In terms of geometric invariants, an integral expression for the first derivative of the Poincare mapping associated with a nu-principal cycle is ...
  • Coexistence of different serotypes of dengue virus
    Esteva, L; Vargas, C (2003)
    We formulate a non-linear system of differential equations that models the dynamics of dengue fever. This disease is produced by any of the four serotypes of dengue arbovirus. Each serotype produces permanent immunity to ...
  • Combinatorial derived invariants for gentle algebras
    Avella-Alaminos, D; Geiss, C (2008)
    We define derived equivalent invariants for gentle algebras, constructed in an easy combinatorial way from the quiver with relations defining these algebras. Our invariants consist of pairs of natural numbers and contain ...
  • Compacidad en la lógica de primer orden y su relación con el teorema de completud
    Amor-Montaño, J A (Las Prensas de Ciencias, 2006)
    El objetivo fundamental de este libro es el estudio del Teorema de Compacidad, sus consecuencias y aplicaciones, así como sus relaciones con el Teorema de Completud.
  • Complete hypersurfaces in R2n+2 with constant negative 2n-th curvature
    Palmas, O (2003)
    We use equivariant geometry methods to show the existence of complete hypersurfaces in euclidean spaces with constant negative 2n-th curvature.
  • Conditional weak laws in Banach spaces
    Meda-Guardiola, Ana (2003)
    Let (B, parallel to . parallel to) be a separable Banach space. Let Y, Y-1, Y-2,... be centered i.i.d. random vectors taking values on B with law mu, mu(.) = P(Y is an element of .), and let S-n = Sigma(i=1)(n) Y-i. Under ...
  • A conditioned law of large numbers for markov additive chains
    Meda-Guardiola, Ana; Ney, P (Studia Scientiarum Mathematicarum Hungarica, 1998)
    Let Yn = (Yn1, Yn2), n = 1, 2, . . . be a sequence of ℝd-valued random variables with Yni ∈ ℝd1, i = 1, 2, d1 + d2 = d, and assume that lim n-1 log E exp 〈α, Yn〉 = Λ(α) ≦ ∞, α ∈ ℝd, exists, and is strictly convex and ...
  • Cones that are 1/2-homogeneous
    Nadler, SB; Pellicer-Covarrubias, P (2007)
    A space is 1/2-homogeneous provided that there are exactly two orbits for the action of 2 the group of homeomorphisms of the space onto itself. Let X be a nonempty compact metric space such that the cone over X is ...
  • Countable 1-transitive coloured linear orderings II
    Campero-Arena, G; Truss, JK (2004)
    This paper gives a structure theorem for the class of countable 1-transitive coloured linear orderings for a countably infinite colour set, concluding the work begun in [1]. There we gave a complete classification of these ...
  • Curso básico de variable compleja
    Lascurain-Orive, A (Las Prensas de Ciencias, 2007)
    La variable compleja es un área central de la matemática aplicada y teórica y es una herramienta fundamental en la física. Esta bella rama presenta una visión unificada de la matemática, ya que interactúa con el cálculo, ...
  • Curso de geometría diferencial. Parte 1. Curvas y superficies
    Palmas-Velasco, O; Reyes-Victoria, J G (Las Prensas de Ciencias, 2008)
    Esta obra es el producto de los cursos de geometría diferencial impartidos por los autores, a lo largo de varios años, a estudiantes de las licenciaturas de matemáticas y de física de la UNAM y la UAM. La presentación ...
  • Curso de geometría diferencial. Parte 2. Geometría intrínseca de las superficies
    Palmas-Velasco, O; Reyes-Victoria, J G (Las Prensas de Ciencias, 2006)
    En esta segunda parte se estudian varios conceptos como son: superficie abstracta diferenciable, espacio tangente a una superficie diferenciable, métricas riemannianas y semiremannianas (de Minkowski) y modelos de ...
  • Curso intermedio de probabilidad
    Rincón, L (Las Prensas de Ciencias, 2008)
    Esta obra proporciona al estudiante los elementos básicos que le permitirán continuar con facilidad materias tales como procesos estocásticos, estadística matemática, probabilidad avanzada o teoría de la medida.
  • Dendrites and light open mappings
    Charatonik, JJ; Charatonik, LJ; Krupski, PL (2000)
    It is shown that a metric continuum X is a dendrite if and only if for every compact space Y and for every light open mapping f : Y --> f(Y) such that X subset of f(Y) there is a copy X' of X in Y for which the restriction ...
  • Diagrams for symplectic type configurations
    Cardenas, H; Lluis, E; Raggi-Cardenas, AG; San Agustin, R (1999)
    In [1] we gave a procedure that associates to each graph Gamma a configuration C(Gamma) of symplectic type. We called this graph "a diagram for the configuration". In the same paper we prove that certain Dynkin-like diagrams ...
  • DIAGRAMS IN CATEGORIES OF PARTIAL LINEAR SPACES OF ORDER TWO
    Cardenas, H; Lluis, E; Raggi-Cardenas, AG; Agustin, RS (2010)
    In this note we define, using a universal property, the concept of diagram for a space in categories of not necessarily finite partial linear spaces of order two and prove that in the category of symplectic-type spaces all ...
  • Dispersion relation of the nonlinear Klein-Gordon equation through a variational method
    Amore, P; Raya, A (2006)
    We derive approximate expressions for the dispersion relation of the nonlinear Klein-Gordon equation in the case of strong nonlinearities using a method based on the linear delta expansion. All the results obtained in this ...
  • Distribution of hammerhead and hammerhead-like RNA motifs through the GenBank
    Ferbeyre, G; Bourdeau, V; Pageau, M; Miramontes, P; Cedergren, R (2000)
    Hammerhead ribozymes previously were found in satellite RNAs from plant viroids and in repetitive DNA from certain species of newts and schistosomes. To determine if this catalytic RNA motif has a wider distribution, we ...

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