Listar Revista de Matemática: Teoría y Aplicaciones por título
Mostrando ítems 78-97 de 319
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Condiciones generales para la construcción de modelos de ˆb 2 ? LmIND
(2009-02-20)We give general conditions that are sufficient to prove existence of models of ˆb2 ? LmIND inside a special set.Keywords: weak arithmetic, non standard model, complexity classes. -
Conformally invariant differential operators and bilinear functionals in six dimensions
(2009-02-25)We review how to construct the Paneitz operator in dimension four and the correspondingoperator in dimension six, by constructing symmetric bilinear differentialfunctionals that are conformally invariant.Keywords: Conformal ... -
Construction and study of local linearization adaptive codes for ordinary differential equations
(2014-04-03)The aim of this work is to construct adaptive integrators for ordinary differential equations based on the Local Linearization method. Different orders of the involved Padé approximation are considered and their effect ... -
Convergence in nonlinear systems with a forcing term
(2009-02-18)The problem of convergence, as t ® +¥ , of solutions of the system (1) is considered. It is assumed that the functions a , f and g are of class C1 for all values of their arguments, furtermore g' (x) > 0 , f ' (x) ³ r > ... -
Coproductos fibrados de morfismos K-finitos
(2009-02-18)In this paper we study conditions under which the push-out of morphisms K-finite are K-finite, and some related problems. -
Creation of a Model of Pollutans Diffusion in Soil-Water System Using a Cellular Automata
(2011-03-18)In this paper is presented a developed model for a pollutant diffusion in a soil-water system, for specific conditions in a real study area. A model that allows the observations of the pollutant flow in the soil-water ... -
Curvas ROC y Vecinos Cercanos, Propuesta de un Nuevo Algoritmo de Condensación
(2011-03-18)k-NN criteria are non parametric methods of statistical classificaction. They are accurate, versatile and distribution free. However, their computational cost may be too expensive; especially for large sample sizes. We ... -
De la fórmula de sumación de Poisson a los teoremas de muestreo y reconstrucción
(2012-03-22)Los radioastrónomos miden la visibilidad de una fuente luminosa para determinar la cantidad de luz emitida y su distribución, bajo el principio que esta es la transformada de Fourier de la visibilidad. En la teoría de la ... -
Definición de semiproductos escalares útiles en análisis de datos
(2009-02-20)We develop the theory necessary for Data Analysis with inner semiproducts, extendingtha classical concepts of inner products usually employed. For this, we usethe basic algebraic definitions of non degenerated bilinear ... -
Deformaciones isométricas infinitesimales de superficies multidimensionales ensambladas
(2012-04-26)The article introduces the concept of multidimensional pasted surfaces and considers the case of different dimensions in the surfaces to be pasted. Infinitesimal deformations of such surfaces are also considered. In a ... -
Deformaciones isométricas infinitesimales de una clase de superficies pegadas
(2009-02-20)In this work the sufficient condition of rigidity of a stuck 4-dimensional surface inthe Euclidean 6-dimensional space is demonstrated. This surface represents in himself,the product of Riemann of two surfaces, each one ... -
Dengue model with early-life stage of vectors and age-structure within host
(2019-12)We construct an epidemic model for the transmission of dengue fever with an early-life stage in the vector dynamics and age-structure within hosts. The early-life stage of the vector is modeled via a general function that ... -
Descomposición de procesos de incrementos independientes en casi intervalos
(2009-02-18)We introduce the notion independent increment in quasi-intervals. Some properties of the fixed points of these processes are studied, as well as those of the aditive descomposition. Finally, we establish the relation between ... -
Descripción de dos métodos de rellenado de datos ausentes en series de tiempo meteorológicas
(2009-02-27)Se presentan dos metodolog´?as para el rellenado de datos ausentes, enfocadas haciasu uso en series de tiempo geof´?sicas. La primera se basa en la descomposici´on encomponentes principales de la matriz de correlaci´on de ... -
Detecting constraint redundancy in 0-1 linear programming problems
(2009-02-19)In this paper we present a procedure for obtaining upper bounds on a linear function by means of certain families of packings, coverings and special ordered sets. We also present a new method for detecting redundant ... -
Detection of unobserved heterogeneity with growth mixture models
(2009-02-27)Latent growth curve models as structural equation models are extensively discussedin various research fields (Duncan et al., 2006). Recent methodological and statisticalextension are focused on the consideration of unobserved ... -
Dice, sticks, pixels and bits: didactic alternatives to explore the methodology of Monte Carlo in a ludic tone
(2013-08-29)This paper presents didactic strategies in a ludic tone to explore the methodology of Monte Carlo and analizes the implementations that have been performed in several educational scenarios. These proposals allow us to put ... -
Differentially closed fields of characteristic zero with a generic automorphism
(2009-02-25)Hrushovski showed that the theory of difference-differential fields of characteristiczero has a model-companion, which we shall denote DCFA. We give an axiomatizationfor DCFA and prove some important model-theoretic results ... -
Dinámica de una huella plana turbulenta alejada
(2009-02-18)From the conservation equation of the quantity of movement and the kinetic energy of the studied turbulence, the dynamics of flat and turbulent path in a non comprehensive liquid environment. In the case of a liquid flow ... -
Dynamics of a two-dimensional discrete-time SIS model
(2012-04-26)We analyze a two-dimensional discrete-time SIS model with a non-constant total population. Our goal is to determine the interaction between the total population, the susceptible class and the infective class, and the ...