Ciencias,UNAM

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Browsing Matemáticas by Issue Date

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  • Multicoherence and compactifications
    Paez, J (1996)
    Let X be a connected, locally connected Tychonoff space. Let r(X) (respectively r(0)(X)) denote the multicoherence degree (respectively open multicoherence degree) of X. Let beta X be the Stone-Cech compactification of X ...
  • Independent sets which meet all longest paths
    RinconMejia, HA; GaleanaSánchez, H (1996)
    We prove some sufficient conditions for a directed graph to have the property of a conjecture of J.M. Laborde, Ch. Payan and N.H. Huang (1982): ''Every directed graph contains an independent set which meets every longest ...
  • Travelling wave phenomena in non-linear diffusion degenerate Nagumo equations
    Maini, PK; SánchezGarduno, F (1997)
    In this paper we study the existence of one-dimensional travelling wave solutions u(x, t) = phi(x - ct) for the non-linear degenerate (at u = 0) reaction-diffusion equation u(t) = [D(u)u(x)](x) + g(u) where g is a ...
  • The Puzzling Origin of the Genetic Code
    Cedergren, R; Miramontes, P (1997)
  • Open mappings increasing order
    Charatonik, JJ; Charatonik, WJ (1997)
    It is shown that an analog of Whyburn's theorem saying that open mappings do not increase order of a point of locally compact metric spaces is not true if the Menger-Urysohn order is replaced by order in the classical ...
  • Algebras whose tits form weakly controls the module category
    Coelho, F; delaPena, JA; Tomé, BM (1997)
  • When is every preradical of R-mod a left exact radical?
    RinconMejia, HA (1997)
  • 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 ...
  • On the evolution of the single-subunit RNA polymerases
    Cermakian, N; Ikeda, TM; Miramontes, P; Lang, BF; Gray, MW; Cedergren, R (1997)
    Many eukaryotic nuclear genomes as well as mitochondrial plasmids contain genes displaying evident sequence similarity to those encoding the single-subunit RNA polymerase (ssRNAP) of bacteriophage T7 and its relatives. We ...
  • On C-alpha-compact subsets
    Sanchis, M; GarcíaFerreira, S; Tamariz, A (1997)
    For an infinite cardinal alpha, we say that a subset B of a space X is C-alpha-compact in X if for every continuous function f:X --> R-alpha, f[B] is a compact subset of R-alpha. This concept slightly generalizes the notion ...
  • Approximations to the configurational energy of dipolar particles on a 2D lattice
    Arce, H; Miramontes, P; López, A; Sánchez, V (1997)
    Current research on critical phenomena and minimum energy configurations of dipolar particles on a 2D lattice, usually approximates the infinite interaction range through a cutoff to carry out numerical simulations. In ...
  • Extensions of functions in Mrowka-Isbell spaces
    Malykhin, VI; Tamariz, A (1997)
    For an almost disjoint family (a.d.f.) Sigma of subsets of omega, let Psi(Sigma) be the Mrowka-Isbell space on Sigma. In this article we will analyze the following problem: given an a.d.f. Sigma and a function phi:Sigma ...
  • L-P-continuity of conditional expectations
    Alonso, A; Brambila-Paz, F (1998)
    A necessary and sufficient condition on a sequence {A(n)}(n is an element of N) of sigma-subalgebras that assures L-p-convergence of the conditional expectations is given. This result generalizes the L-p-martingales, the ...
  • The origins of set theory, 1854-1908
    Garcíadiego, AR (1998)
  • Key dynamics from a simple model of HIV infection
    Garduno, FS; Kirschner, D; Reynolds, J (1998)
    There have been many models to date describing the interaction of the immune system with HIV. Each presents some aspect or aspects of the immune system believed to play a key role in the disease dynamics. In this study, ...
  • 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 ...
  • Analysis of a Dengue disease transmission model
    Esteva, L; Vargas, C (1998)
    A model for the transmission of dengue fever in a constant human population and variable vector population is discussed. A complete global analysis is given, which uses the results of the theory of competitive systems and ...
  • 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 ...
  • A model for dengue disease with variable human population
    Esteva, L; Vargas, C (1999)
    A model for the transmission of dengue fever with variable human population size is analyzed. We find three threshold parameters which govern the existence of the endemic proportion equilibrium, the increase of the human ...
  • 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 ...

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