Ciencias,UNAM

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Browsing Matemáticas by Title

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  • Invariant pseudometrics on Palais proper G-spaces
    de Neymet, S; Antonyan, SA (2003)
    Let G be a locally compact Hausdorff group. It is proved that: (1) on each Palais proper G-space X there exists a compatible family of Ginvariant pseudometrics
  • Invitación a las geometrías no euclidianas
    Ramírez, A I; Sien, G (Las Prensas de Ciencias, 2003)
    Las geometrías no euclidianas involucran disciplinas aparentemente tan disímbolas como son la geometría, las artes y la lógica. Este libro pone al alcance del neófito esta apasionante disciplina.
  • ITERATED COIL ENLARGEMENTS OF ALGEBRAS
    Tomé Arreola, Bertha Maria (1995)
    Let Lambda be a finite-dimensional, basic and connected algebra over an algebraically closed field, and mod Lambda be the category of finitely generated right Lambda-modules. We say that Lambda has acceptable projectives ...
  • ITERATED TUBULAR ALGEBRAS
    DELAPENA, JA; Tomé, BM (1990)
  • 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, ...
  • 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 ...
  • Large-scale oscillation of structure-related DNA sequence features in human chromosome 21
    Li, WT; Miramontes, P (2006)
    Human chromosome 21 is the only chromosome in the human genome that exhibits oscillation of the (G+C) content of a cycle length of hundreds kilobases (kb) (500 kb near the right telomere). We aim at establishing the existence ...
  • The lattice structure of preradicals
    Raggi, F; Montes, JR; Rincon, H; Fernandez-Alonso, R; Signoret, C (2002)
    In this paper we study the lattice of all preradicals on a ring R. We describe this lattice, we prove that it is an atomic and coatomic lattice and we describe the atoms and coatoms. We also give characterizations of simple ...
  • LINES OF CURVATURE NEAR UMBILICAL POINTS ON SURFACES IMMERSED IN R(4)
    SánchezBRINGAS, F; RamirezGALARZA, AI (1995)
    Let M be a compact orientable surface, I : M --> R(4) an immersion of class C-r and nu a normal unitary smooth vector field. We prove that in the space of pairs (I, nu) the family of pairs all whose umbilical points are ...
  • Mathematical model to assess the control of Aedes aegypti mosquitoes by the sterile insect technique
    Esteva, L; Yang, HM (2005)
    We propose a mathematical model to assess the effects of irradiated (or transgenic) male insects introduction in a previously infested region. The release of sterile male insects aims to displace gradually the natural ...
  • Maximal prevalence and the basic reproduction number in simple epidemics
    Esteva, L; Hadeler, KP (2002)
    For the basic versions of the SIR and SIRS epidemic models estimates for the maximal prevalence are computed in terms of the basic reproduction number and other relevant quantities. Maximal prevalence is studied as a ...
  • 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 ...
  • A model for vector transmitted diseases with saturation incidence
    Esteva, L; Matias, M (2001)
    A model for a disease that is transmitted by vectors is formulated. All newborns are assumed susceptible, and human and vector populations are assumed to be constant. The model assumes a saturation effect in the incidences ...
  • Modeling of biological rhythms - To Rene Thom, in memoriam
    Fuentes-Pardo, B; Guzman-Gomez, A; Lara-Aparicio, M; de Medrano, SL (2005)
    We present some conclusions of our experience as a group of biologists and mathematicians in modeling circadian rhythms. These conclusions involve a reflection on the general interrelations between Biology and Mathematics ...
  • Modelling parasitism and predation of mosquitoes by water mites
    Esteva, L; Rivas, G; Yang, HM (2006)
    Parasitism and predation are two ecological interactions that can occur simultaneously between two species. This is the case of Culicidae (Insecta: Diptera) and water mites (Acari: Hydrachnidia). The larva mites are parasites ...
  • Modelling the dynamics of dengue real epidemics
    Pinho, STR; Ferreira, CP; Esteva, L; Barreto, FR; Silva, VCME; Teixeira, MGL (2010)
    In this work, we use a mathematical model for dengue transmission with the aim of analysing and comparing two dengue epidemics that occurred in Salvador, Brazil, in 1995-1996 and 2002. Using real data, we obtain the force ...
  • Modelling the dynamics of West Nile Virus
    Cruz-Pacheco, G; Esteva, L; Montano-Hirose, JA; Vargas, C (2005)
    In this work we formulate and analyze a mathematical model for the transmission of West Nile Virus (WNV) infection between vector (mosquito) and avian population. We find the Basic Reproductive Number R-0 in terms of ...
  • 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 ...
  • Natural classes, left exact preradicals, and flat epimorphisms
    Rincon-Mejia, HA; Ríos-Montes, J; Alvarado, A (2003)
    We define a function between the lattice of left exact preradicals in R-mod and the complete boolean lattice R-nat of natural classes in R-mod in such a way that the image of this function results to be a complete sublattice ...
  • NOETHERIAN BASES IN SPACES WITH AN ORTHOBASE
    Tamariz, A (1990)
    A collection C of subsets of a set X is said to be Noetherian if C does not contain a strictly increasing infinite chain. A space X is Noetherianly refinable, or more briefly, N - refinable, if each open covering of X has ...

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