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Differentially closed fields of characteristic zero with a generic automorphism
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 ...
Algoritmo de Karmarkar y matrices ralas
Algoritmo de Karmarkar y matrices ralas
(2009-02-18)
This is the second of a series of two articles en which we study the Karmarkar’s method. In this article we are going to show how can we use sparse matrix theory to get an efficient implementation of the Karmarkar’s process ...
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 ...
The role of short-term immigration on disease dynamics: An SIR model with age-structure
El rol de la inmigración en periodos cortos sobre la dinámica de enfermedades: un modelo sir con estructura de edad
(2019-02-18)
We formulate an age-structured nonlinear partial differential equation model that features short-term immigration effects in a population. Individuals can immigrate into the population as any of the three stages in the ...
Modelos minimales de la recta hiperreal
Modelos minimales de la recta hiperreal
(2009-02-18)
A new proof of the existence of minimal models of the hiperreal line is obtained in terms of a combinatorial property of Ramsey ultrafilters over a countable set.
Symmetry orbits and their data-analytic properties
Orbitas de simetría y sus propiedades en análisis de datos
(2013-08-29)
The concept of data indexed by finite symmetry orbits is reviewed within the data-analytic framework of symmetry studies. Data decompositions are discussed in terms of canonical projections and Plancherel’s formulas, and ...
La factorización de una transformada de Fourier en el método de Wiener-Hopf
(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 ...
Generalization of Rakotch's fixed Point Theorem
Generalization of Rakotch's fixed Point Theorem
(2011-04-29)
In this paper we get some generalizations of Rakotch's results [10] using the notion of $\omega ?distancia$ on a metric space
Analysis and Design of the Knowledge Representation for the Implementation of a Distributed Reasoning
Analysis and Design of the Knowledge Representation for the Implementation of a Distributed Reasoning
(2011-04-29)
The representation of knowledge and the reasoning comprise fundamental parts of the design of an expert system. In the case under study the real world is represented by the different events that can arise in the operation ...
Casi-ortogonalidad y proximidad en L2 de martingalas pii en casi intervalos
Casi-ortogonalidad y proximidad en L2 de martingalas pii en casi intervalos
(2009-02-18)
It was introduced in [2] the notion of prOcess with independent increments in near-intervals (PII), establishing the existence of a decomposition into components with certain regularity properties. In this work we deepen ...