Browsing Matemática by Title
Now showing items 43-62 of 232
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Characterization of principal bundles: the commutative case
(2023-10-04)A review of the characterization of principal bundles, through the different properties of the action of a group and its related canonical and translation maps, is presented. The work is divided in three stages: a topological ... -
Characterization of principal bundles: the noncommutative algebraic case
(2024)We review Hopf–Galois extensions, in particular faithfully flat ones, accepted to be the noncommutative algebraic dual of a principal bundle. We also make a short digression into how quantum groups relate to Hopf—Galois ... -
Characterization of two-parameter matrix valued BMO by commutator with the Hilbert Transform
(2018)In this paper, we prove that the space of two parameter matrix-valued BMO functions can be characterized by considering iterated commutators with the Hilbert transform. The upper estimate relies on Petermichl's representation ... -
Clifford Geometry: a Seminar
(1995-12-15)Este documento fue desarrollado durante el seminario de posgrado SP--1313 (Seminario en Matemática A) en 1995; por razones de difusión, fue redactado en inglés. Se trata de una exposición de los aspectos de la geometría ... -
Climate-based descriptive models of dengue fever: The 2002 epidemic in Colima, Mexico
(2006-06)Dengue is a public health problem on the rise in many tropical regions and affects approximately 100 million people every year worldwide. In this paper, the authors retrospectively assess the association between five ... -
Climate-Driven Statistical Models as Effective Predictors of Local Dengue Incidence in Costa Rica: A Generalized Additive Model and Random Forest Approach
(2019-12)Climate has been an important factor in shaping the distribution and incidence of dengue cases in tropical and subtropical countries. In CostaRica, a tropical country with distinctive micro-climates, dengue has been endemic ... -
Clustering binary data by application of combinatorial optimization heuristics
(2019-08-09)We study clustering methods for binary data, first defining aggregation criteria that measure the compactness of clusters. Five new and original methods are introduced, using neighborhoods and population behavior combinatorial ... -
Clustering via ant colonies: Parameter analysis and improvement of the algorithm
(2020-04-18)An ant colony optimization approach for partitioning a set of objects is proposed. In order to minimize the intra-variance, or within sum-of-squares, of the partitioned classes, we construct ant-like solutions by a ... -
Combinatorics of renormalization as matrix calculus
(2006)We give a simple presentation of the combinatorics of renormalization in perturbative quantum field theory in terms of triangular matrices. The prescription, that may be of calculational value, is derived from first ... -
Comparative analysis of dengue versus chikungunya outbreaks in Costa Rica
(2018-06)For decades, dengue virus has been a cause of major public health concern in Costa Rica, due to its landscape and climatic conditions that favor the circumstances in which the vector, Aedes aegypti, thrives. The emergence ... -
Connes' noncommutative differential geometry and the Standard Model
(1993-11)In this paper, the Connes-Lott approach to the phenomenological Lagrangian of the standard theory of elementary particles is reviewed in detail. The paper is self-contained, in that the necessary foundations in noncommutative ... -
Connes' tangent groupoid and strict quantization
(1999-12)We address one of the open problems in quantization theory recently listed by Rieffel. By developing in detail Connes' tangent groupoid principle and using previous work by Landsman, we show how to construct a strict flabby ... -
Contribuciones al estudio de las métricas en análisis de datos
(2012-10-25)Nos hemos planteado estudiar la dependencia de los resultados al cambiar las métricas para el mtodo de Análisis en Componentes Principales (A.C.P.). En efecto, para este análisis el problema de la escogencia de la distancia ... -
Contributions to the continuity problem for Lyapunov exponents
(2018)O objetivo deste trabalho é estudar a continuidade e a semi-continuidade dos expoentes de Lyapunov em dois contextos diferentes. O primeiro diz respeito a cociclos lineares sobre dinâmicas parcialmente hiperbólicas. É ... -
Correction to: The chirality theorem
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Dataducto para construir Emuladores Estadísticos con datos de NARCCAP
(2019-01-25)El proyecto de investigación B7166 de la Universidad de Costa Rica tiene como objetivo principal presentar un marco estadístico para realizar una emulación de variables obtenidas por medio del Modelo Climático Regional ... -
Definable Additive Subgroups of Partial Differential Fields of Characteristic Zero with an Automorphism
(2020-10-19)Abstract.The theory of partial differential fields of characteristic zero withan automorphism has a model companion denoted DCFmA. This theory isnot complete, but its completions are easily discribed. They are supersimpleand ... -
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 ... -
Density functional theory on phase space
(2012)Forty-five years after the point de départ [Hohenberg and Kohn, Phys. Rev. 1964, B864, 136] of density functional theory, its applications in chemistry and the study of electronic structures keep steadily growing. However, ... -
Desarrollo y análisis del comportamiento humano adaptativo en modelos con relapso no lineal
(2023)En este proyecto proponemos estudiar las propiedades teóricas y nuevas aplicaciones de un algoritmo de formulación recuente para modelar las decisiones de contacto humanas en modelos epidemiológicos, que es llamado el ...