Now showing items 163-182 of 312

    • K-finite decidable objects and finite cardinals in an arbitrary topos 

      Acuña Ortega, Osvaldo (2012-03-08)
      In an elemetary topos $\varepsilo$, we prove that the class of K-finite decidable objects is the same to the class of finite cardinals in E if and only if every K-finite decidable object X such that $X \longrightarrow 1$ ...
    • K-finite objects and decidability 

      Acuña Ortega, Osvaldo (2014-01-01)
      We study the k-finite and decidable objects in an elementary topos. We prove some results concerning k-finite and decidable objects.  
    • L3: the geometry of pseudoquaternions 

      Birman, Graciela Silvia (2009-02-18)
      We introduce pseudoquaternions as an effective tool to describe the vector analysis in L3 , and we use them to characterIze null curves and null cubics in S12 .Keywords: pseudoquaternions, vector analysis, null curves
    • La Ecuación de Hill con Potencial Irregular 

      Cambronero, Santiago (2012-03-29)
      We consider the Hill equation whose potential is the formal derivative of a Hölder – continuous function of parameter \theta \in (0,1), and show that solutions of the discrete version converge to solutions of the original ...
    • La ecuación de Navier-Stokes y multifractales 

      Mercado Escalante, José Roberto (2009-02-25)
      There is currently no general theorem on the existence and unicity of solutions tothe Navier-Stokes equation, which describes the flow of a viscous and incompressiblefluid. This is an open problem at the international ...
    • La Expansión Asintótica de Núcleos Distribucional 

      Ulate Ramírez, Carlos Manuel (2012-03-28)
      Este artículo utiliza la técnica de expansión asintótica parcial aplicada a distribuciones de orden finito, con el fin de obtener la expansión distribucional de núcleos de la forma f( /lambda x , y), cuando /lambda  tiende ...
    • La factorización de una transformada de Fourier en el método de Wiener-Hopf 

      Rosales Ortega, José; Márquez Rivera, Carlos (2009-02-18)
      Using the Wiener-Hopf method, we factorize the Fourier Transform of the kernel of a singular integral equation as the product of two functions: one holomorphic in the upper semiplan and the other holomophic in the lower ...
    • La teoría de respuesta a los itemes: una moderna alternativa para el análisis psicométrico de instrumentos de medición 

      Montero Rojas, Eiliana (2009-02-19)
      La Teoría de Respuesta a los Itemes, TRI, (o "Item Response Theory", en inglés) es un enfoque más poderoso que la Teoría Clásica de los Tests para el análisis de calidad técnica de instrumentos de medición psicométricos. ...
    • Lagrangean relaxation for the geographical partitioning problem 

      Díaz García, Juan Antonio; Bernabé Loranca, María Beatriz; Luna Reyes, Dolores Edwiges; Olivares Benítez, Elías; Martínez Flores, José Luis (2012-07-01)
      Among methodologies used in territory clustering, stand location-allocation and set partitioning models, to group small geographic areas, usually called “basic units” into a given number of larger groups called “territories”. ...
    • Las ecuaciones de Reynolds y la relación de clausura 

      Mercado Escalante, José Roberto (2009-02-27)
      We posed the problem to obtain the closure relation for the Reynolds equations.And like secondary target, to obtain analytical expressions for the Reynolds stress.Showing its jump of discontinuity like expression of the ...
    • Latent class analysis in sparse data: alcohol, tobacco and other drugs in teenagers 

      Araya Alpízar, Carlomagno; Sepúlveda, Rosa (2010-04-16)
         The contribution of this study is the multidimensional approachon patterns of drug use among young people. The data come fromthe study ”Factors that influence the consumption of drugs, juvenilepopulation. Central region ...
    • Lemniscatas 3D 

      Ortega, Rafael; Paluszny, Marco (2009-02-20)
      A 3D lemniscate is a surface consisting of all points whose product of distances toa (finite) set of points or foci is constant. We introduce 3D lemniscates in the contextof geometric modelling and consider its deformation, ...
    • LENSING PROPERTIES OF THE EINASTO PROFILE IN TERMS OF THE MEIJER G FUNCTION 

      Retana Montenegro, Edwin; Frutos Alfaro, Francisco (2014-07-01)
      In N-body simulations of cold dark matter, it has been found that three-parameter models, particularly the Einasto profile, yield better fits to a wide range of dark matter haloes than two parameter models like the ...
    • Limit Theorems in Bellman–Harris Processes with Finites Second Moments 

      Llinás Solano, Humberto (2010-07-02)
      In this article are studied different theorems limits in a criticalBellman-Harris branching process with a only type of particle and with finite second moments. There were used two processes in order to figure out the ...
    • Lobachevski descubridor de la Geometría Hiperbólica 

      Boza Cordero, Juan (2012-03-21)
      We offer an overview of the geometric studies of the russian mathematician N.I. Lobachevski (1792?1856), which culminated with the discovery of the hyperbolic geometry. We analize the role of the V Postulate in the euclidean ...
    • Local convergence of exact and inexact newton’s methods for subanalytic variational inclusions 

      Cabuzel, Catherine; Pietrus, Alain; Burnet, Steeve (2015-01-01)
      This paper deals with the study of an iterative method for solving a variational inclusion of the form 0 ∈ f (x)+F (x) where f is a locally Lipschitz subanalytic function and F is a set-valued map from Rn to the closed ...
    • Location of police cars for public surveillance using two multicriteria models 

      García G., María J.; Hernández, Gilberto; Hernández R., José G. (2014-04-03)
      The criminal boom in some Latin-American cities obliges the increment of patrols and policemen. Sadly they do not there sufficient vehicles to locate in all the places candidates. In the location of patrols, there are many ...
    • Los valores del juego de parada óptima para medias aritméticas de variables de Bernoulli 

      Lobo Segura, Jaime; Cambronero, Santiago (2009-02-20)
      We study optimal stopping problems for generalized averages of identically distributedBernoulli variables, taking values in the set D = {d0, d1}. We obtain a recurrentformula in the finite horizon case, which gives the ...
    • MATHEMATICAL MODEL FOR TOXIN TRANSPORT IN A MARINE FOOD CHAIN 

      Arbeláez A., Daniel; Ruiz V., Jorge Mauricio (2014-07-01)
      Some cases of poisoning by consumption of contaminated fish, like the Ciguatera poisoning, occur unexpectedly and they are not easy to detect previously since the fish that carry the toxin do not have appearance and/or ...
    • Metodología estadística: bases para el establecimiento de políticas adecuadas para el manejo del arbolado urbano en la Ciudad de México 

      Aldama Ojeda, Alejandro; Vázquez, Héctor J.; Grabinsky, Jaime; Chacalo, Alicia (2009-02-20)
      An Exploratory analysis using arboricultural and ecological statistical approachesof a representative sample of Mexico City’s street trees were followed by a confirmatorystudy through Path Analysis to test hypothesis stating ...