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Browsing Matemáticas by Title

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  • Quadratic forms associated to stratifying systems
    Marcos, EDN; Mendoza, O; Saenz, C; Zuazua Vega, Rita Esther (2006)
    Let R be an algebra, and let (theta, <=) be a stratifying system of R-modules. If the category) F(theta) is theta-directing, then we prove that ind F(theta) is finite. In order to do that, we introduce a quadratic form ...
  • A qualitative model of a motor circadian rhythm
    Fuentes-Pardo, B; Guzman-Gomez, AM; Lara-Aparicio, M; de Medrano, SL (2003)
    In Nature it is possible to observe diverse rhythms. Because of their adaptive characteristics, the circadian rhythms are of major importance and have been the subject of numerous experimental and theoretical studies. In ...
  • Rates of convergence for the Nummelin conditional weak law of large numbers
    Kuelbs, J; Meda-Guardiola, Ana (2002)
    Let (B, parallel to . parallel to) be a real separable Banach space of dimension 1 less than or equal to d less than or equal to infinity, and assume X,X-1, X-2,... are i.i.d. B valued random vectors with law mu=L(X) and ...
  • Rates of convergence for the Nummelin conditional weak law of large numbers
    Kuelbs, J; Meda-Guardiola, A (Stochastic Processes and their Applications, 2002)
    Let (B, ∥· ∥) be a real separable Banach space of dimension 1 ≤ d ≤ ∞, and assume X,X1, X2,... are i.i.d. B valued random vectors with law μ=σl(X) and mean m=∫Bxdμ(x). Nummelin's conditional weak law of large numbers ...
  • Reaseguro
    Minzoni-Consorti, A (Las Prensas de Ciencias, 2004)
    Ante la ausencia de textos en español, Antonio Minzoni entrega a la comunidad de actuarios, a los interesados en los seguros y muy especialmente, a los estudiantes universitarios, un arma que les será de gran utilidad.
  • Reaseguro financiero y art
    Minzoni-Consorti, A (Las Prensas de Ciencias, 2007)
    Esta obra resume el contenido de los cursos impartidos a los estudiantes de actuaría de la Facultad de Ciencias, así como de conferencias y artículos en revistas especializadas que el Dr. Minzoni, decano de la actividad ...
  • Retractions and contractibility in hyperspaces
    Charatonik, JJ; Pellicer-Covarrubias, P (2007)
    Given a metric continuum X, let 2(X) denote the hyperspace of all nonempty closed subsets of X. For each positive integer k let C-k(X) stand for the hyperspace of members of 2(X) having at most k components. Consider ...
  • Ruelle operator and transcendental entire maps
    Dominguez, P; Makienko, PM; Sienra, G (2005)
    We calculate the Ruelle operator of a transcendental entire function f having only a finite set of algebraic singularities. Moreover, under certain topological conditions on the postcritical set we prove (i) if f has a ...
  • Scale-free foraging by primates emerges from their interaction with a complex environment
    Boyer, D; Ramos-Fernandez, G; Miramontes, O; Mateos, JL; Cocho, G; Larralde, H; Ramos, H; Rojas, F (2006)
    Scale-free foraging patterns are widespread among animals. These may be the outcome of an optimal searching strategy to find scarce, randomly distributed resources, but a less explored alternative is that this behaviour ...
  • Seasonality and Outbreaks in West Nile Virus Infection
    Cruz-Pacheco, G; Esteva, L; Vargas, C (2009)
    In this paper we analyze the impact of seasonal variations on the dynamics of West Nile Virus infection. We are interested in the generation of new epidemic peaks starting from an endemic state. In many cases, the oscillations ...
  • SEMIKERNELS, QUASI KERNELS, AND GRUNDY FUNCTIONS IN THE LINE DIGRAPH
    RINCONMEJIA, HA; GALEANASánchez, H; Ramirez, LP (1991)
    It is proved that the number of semikernels (quasi kernels) of a digraph D is less than or equal to the number of semikernels (quasi kernels) of its line digraph L(D). It is also proved that the number of Grundy functions ...
  • SHORE POINTS AND DENDRITES
    NEUMANNLARA, V; PUGAESPINOSA, I (1993)
    A point x in a dendroid X is called a shore point if there is a sequence of subdendroids of X not containing x and converging to X in the Hausdorff metric. We give necessary and sufficient conditions for a dendroid to be ...
  • Shore points and noncut points in dendroids
    Neumann-Lara, V; Puga, I (1999)
    A point p in a dendroid X is a shore point if there exists a sequence of subdendroids of X not containing p and converging to X with respect to the Hausdorff metric. The purpose of this paper is to present new results ...
  • SHORE POINTS IN DENDROIDS AND CONICAL POINTED HYPERSPACES
    MONTEJANOPEIMBERT, L; PUGAESPINOSA, I (1992)
    If X is a continuum and mu a Whitney map for C(X), a subcontinuum Y of C(X) is mu-conical pointed if for some lambda is-an-element-of [0, 1), the cone K (mu--1(lambda) AND Y) of mu--1(lambda) AND Y is homeomorphic with ...
  • A short proof that hyperspaces of Peano continua are absolute retracts
    Antonyan, SA (2001)
  • Simulation of the clonal growth of Bostrychia radicans (Ceramiales-Rhodophyta) using Lindenmayer systems
    ColladoVides, L; GomezAlcaraz, G; RivasLechuga, G; GomezGutierrez, V (1997)
    A mathematical model for the clonal growth of the alga Bostrychia radicans was constructed based on architectural growth rules and Lindenmayer systems. The sequence of theoretical growth and invasive strategy of space is ...
  • Some dynamical properties of mappings defined on Knaster continua
    Mendez-Lango, H (2002)
    We present an arc-like continuum X and a mapping f : X --> X with the following properties: The set of recurrent points of f is dense in X
  • Some new topological cardinal inequalities
    Casarrubias-Segura, F; Contreras-Carreto, A; Ramirez-Paramo, A (2007)
    In this paper we make use of the Pol-Sapirovski's technique to prove several cardinal inequalities, which generalize other well-known inequalities. (C) 2006 Elsevier B.V. All rights reserved.
  • Spacesof continuous functions defined on Mrowka spaces
    Hrusak, M; Szeptycki, PJ; Tamariz, A (2005)
    We prove that for a maximal almost disjoint family A on omega, the space C-p(Psi (A), 2(omega)) of continuous Cantor-valued functions with the pointwise convergence topology defined on the Mrowka space Psi (A) is not normal. ...
  • Spatio-temporal dynamics of a three interacting species mathematical model inspired in physics
    Brena-Medina, VE; Sánchez-Garduno, F (2008)
    In this paper we study both, analytically and numerically, the spatio-temporal dynamics of a three interacting species mathematical model. The populations take the form of pollinators, a plant and herbivores

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