• Aritmética para maestros: el número, su operatoria y su enseñanza 

      Vindas Parajeles, Jorge (1996)
      Es un manual en el que se desarrolla, de una forma sencilla, una posible introducción del niño preescolar y escolar al campo del número y del cálculo aritmético. Se sugieren actividades que tienen una función didáctica ...
    • Asociación entre la introducción de la vacuna contra el COVID-19 y el Índice Mensual de Actividad Económica en Costa Rica 

      Orozco Castillo, John (2023)
      Este trabajo es un esfuerzo por lograr asociar el comportamiento de la economía de Costa Rica afectada por las restricciones impuestas por la pandemia COVID-19 y la introducción de la vacuna contra el virus causante ...
    • Asymptotic expansion of the invariant measure for ballistic random walk in the low disorder regime 

      Campos Fernández, José David; Ramírez Chuaqui, Alejandro Francisco (2015)
      We consider a random walk in random environment in the low disorder regime on Zd. That is, the probability that the random walk jumps from a site x to a nearest neighboring site x+e is given by p(e)+ǫξ(x,e), where p(e) is ...
    • Área y multiplicación 

      Alarcón Athens, Winston (1990)
      Mostramos que la fórmula “área de un rectángulo de base b y altura h = b.h” surge de las propiedades exigidas al concepto “área de un rectángulo” en la actividad de los colectivos humanos, las que quedaron reflejadas en ...
    • Characterization of principal bundles: the commutative case 

      Ugalde Gómez, William Javier (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 two-parameter matrix valued BMO by commutator with the Hilbert Transform 

      Mena Arias, Darío Alberto (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 

      Várilly Boyle, Joseph C.; Gracia Bondía, José M. (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 

      Chowell, Gerardo; Sánchez Peña, Fabio Ariel (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 

      Vásquez Brenes, Paola Andrea; Loría García, Antonio; Sánchez Peña, Fabio Ariel; Barboza Chinchilla, Luis Alberto (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 

      Trejos Zelaya, Javier; Amaya Briceño, Luis Eduardo; Jiménez Romero, Alejandra; Murillo Fernández, Alex; Piza Volio, Eduardo; Villalobos Arias, Mario Alberto (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 

      Chavarría Molina, Jeffry; Fallas Monge, Juan José; Trejos Zelaya, Javier (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 

      Ebrahimi Fard, Kurusch; Gracia Bondía, José M.; Guo, Li; Várilly Boyle, Joseph C. (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 

      Sánchez Peña, Fabio Ariel; Barboza Chinchilla, Luis Alberto; Burton, David; Cintrón Arias, Ariel (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 

      Várilly Boyle, Joseph C.; Gracia Bondía, José M. (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 

      Cariñena Marzo, José F.; Clemente Gallardo, Jesús; Follana, Eduardo; Gracia Bondía, José M.; Rivero, Alejandro; Várilly Boyle, Joseph C. (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 

      Bolaños Guerrero, Fabricio (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 

      Sánchez Chavarría, Adriana Cristina (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 

      Gracia Bondía, José M.; Mund, Jens; Várilly Boyle, Joseph C. (2018-10)
    • Dataducto para construir Emuladores Estadísticos con datos de NARCCAP 

      Fonseca Rivera, Johan; Alfaro Córdoba, Marcela; Barboza Chinchilla, Luis Alberto (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 

      Bustamante Medina, Ronald F. (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 ...