Ciencias,UNAM

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Browsing Matemáticas by Submit Date

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  • The topology of the Banach-Mazur compactum
    Antonyan, SA (2000)
    Let J(n) be the hyperspace of all centrally symmetric compact convex bodies A subset of or equal to R-n, n greater than or equal to 2, for which the ordinary Euclidean unit ball is the ellipsoid of maximal volume contained ...
  • Openness of induced projections
    Charatonik, JJ; Charatonik, WJ; Illanes, A (2000)
    For continua X and Y it is shown that if the projection f : X x Y --> X has its induced mapping C(f) open, then X is C-smooth. As a corollary, a characterization of dendrites in these terms is obtained.
  • Facial expression recognition and modeling for virtual intelligent tutoring systems
    Ríos, HV; Solis, AL; Aguirre, E; Guerrero, L; Pena, J; Santamaria, A (2000)
    This paper describes ongoing work for developing a new interface for intelligent tutoring systems based on recognition and synthesis of facial expressions. This interface senses the emotional state of the user, or his/her ...
  • Influence of vertical and mechanical transmission on the dynamics of dengue disease
    Esteva, L; Vargas, C (2000)
    We formulate a non-linear system of differential equations that models the dynamics of transmission of dengue fever. We consider vertical and mechanical transmission in the vector population, and study the effects that ...
  • Alternating chaotic and periodic dynamics in Chern-Simons-Higgs theory with scalar magnetic interaction
    Escalona, J; Antillon, A; Jiang, Y; Parmananda, P; Villavicencio, M (2000)
    The dynamical behavior of a Chern-Simons-Higgs system is studied for the spatially homogeneous case. The model, described by interacting gauge and scalar fields includes two parity and time violating terms: the Chern-Simons ...
  • O(2) x O(2)-invariant hypersurfaces with zero scalar curvature
    Palmas, O (2000)
    We use equivariant geometry methods to study and classify zero scalar curvature, O(2) x O(2)-invariant hypersurfaces in Euclidean 4-space.
  • 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 ...
  • Alternans and higher-order rhythms in an ionic model of a sheet of ischemic ventricular muscle
    Arce, H; Xu, AX; Guevara, MR; González, H (2000)
    Life-threatening arrhythmias such as ventricular tachycardia and fibrillation often occur during acute myocardial ischemia. During the first few minutes following coronary occlusion, there is a gradual rise in the extracellular ...
  • 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, ...
  • p-pseudocompactness and related topics in topological spaces
    Sanchis, M; Tamariz, A (1999)
    We prove some basic properties of p-bounded subsets (p epsilon omega) in terms of z-ultrafilters and families of continuous functions, We analyze the relations between p-pseudocompactness with other pseudocompact like-properties ...
  • Extensorial properties of orbit spaces of proper group actions
    Antonyan, SA (1999)
    Extensorial properties of orbit spaces of locally compact proper group actions are investigated. (C) 1999 Elsevier Science B.V. All rights reserved.
  • Openness and monotoneity of induced mappings
    Charatonik, WJ (1999)
    It is shown that for locally connected continuum X if the induced mapping C(f) : C(X) --> C(Y) is open,then f is monotone. As a corollary it follows that if the continuum X is hereditarily locally connected and C(f) is ...
  • 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 ...
  • On some classes of R-modules and congruences in R-tors
    Raggi, F; Rincon, H; Signoret, C (1999)
  • 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 ...
  • The origins of set theory, 1854-1908
    Garcíadiego, AR (1998)
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...

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