Now showing items 1-20 of 24

    • A BDDC algorithm with deluxe scaling for H(curl) in two dimensions with irregular subdomains 

      Calvo Alpízar, Juan Gabriel (2015)
      A bound is obtained for the condition number of a BDDC algorithm for problems posed in H(curl) in two dimensions, where the subdomains are only assumed to be uniform in the sense of Peter Jones. For the primal variable ...
    • A new coarse space for overlapping Schwarz algorithms for H(curl) problems in three dimensions with irregular subdomains 

      Calvo Alpízar, Juan Gabriel (2019)
      A new coarse space for a two-level overlapping Schwarz algorithm is presented for problems posed in three dimensions in the space H(curl, Ω). Previous studies for these methods are very restrictive about the geometry of ...
    • A two-level overlapping Schwarz method for H(curl) in two dimensions with irregular subdomains 

      Calvo Alpízar, Juan Gabriel (2015-10-07)
      A bound is obtained for the condition number of a two-level overlapping Schwarz algorithm for problems posed in H(curl) in two dimensions, where the subdomains are only assumed to be John subdomains. The coarse space is ...
    • An adaptive choice of primal constrains for BDDC domain decomposition algorithms 

      Calvo Alpízar, Juan Gabriel; Widlund, Olof B. (2016-12-12)
      An adaptive choice for primal spaces based on parallel sums is developed for BDDC deluxe methods and elliptic problems in three dimensions. The primal space, which forms the global, coarse part of the domain decomposition ...
    • An overlapping Schwarz method for virtual element discretizations in two dimensions 

      Calvo Alpízar, Juan Gabriel (2019)
      A new coarse space for domain decomposition methods is presented for nodal ellipticproblems in two dimensions. The coarse space is derived from the novel virtual elementmethods and therefore can accommodate quite irregular ...
    • 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 ...
    • 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 ...
    • Drinking as an epidemic - a simple mathematical model with recovery and relapse 

      Sánchez Peña, Fabio Ariel; Wang, Xiaohong; Castillo Chávez, Carlos; Gorman, Dennis M.; Gruenewald, Paul J. (2007)
      This chapter discusses a simple mathematical model of drinking lapse. Problem drinking is modeled as an acquired state - the result of frequent or intense interactions among individuals in three drinking states within a ...
    • Estimation of the yield curve for Costa Rica using metaheuristic optimization 

      Quirós Granados, Andrés; Trejos Zelaya, Javier (2017-06-30)
      The term structure of interest rates or yield curve is a function relating the interest rate with its own term. Nonlinear regression models of Nelson-Siegel and Svensson were used to estimate the yield curve using a sample ...
    • Faltings heights of CM elliptic curves and special Gamma values 

      Barquero Sánchez, Adrián Alberto; Cadwallader, Lindsay; Cannon, Olivia; Genao, Tyler; Masri, Riad (2017-12)
      In this paper, we evaluate the Faltings height of an elliptic curve with complex multiplication by an order in an imaginary quadratic field in terms of Euler’s Gamma function at rational arguments.
    • Geometrical correlation indices using homological constructions on manifolds 

      Solís Chacón, Maikol; Hernández Alvarado, Alberto José; Zúñiga Rojas, Ronald Alberto (2018)
      Abstract The course of dimensionality is a common problem in statistics and data analysis. Variable sensitivity analysis methods are a well studied and established set of tools designed to overcome these sorts of problems. ...
    • Groups with f-generics in NTP2 and PRC fields 

      Montenegro Guzmán, Samaria; Onshuus Niño, Alf; Pierre Sigué, Simon (2018)
      We study groups with f-generic types definable in bounded PRC fields. Along the way, we generalize part of the basic theory of definably amenable NIP groups to NTP2theories and prove variations on Hrushovski’s stabilizer theorem.
    • Imaginaries, invariant types and pseudo p-adically closed fields 

      Montenegro Guzmán, Samaria; Rideau Kikuchi, Silvain (2019-04-29)
      In this paper, we give a general criterion for elimination of imaginaries using an abstract independence relation. We also study germs of definable functions at certain well-behaved invariant types. Finally we apply these ...
    • Isometry groups of borel randomizations 

      Berenstein, Alex; Zamora Calero, Rafael (2018-08)
      We study global dynamical properties of the isometry group of the Borel randomization of a separable complete structure. In particular, we show that if properties such as the Rohklin property, topometric generics, extreme ...
    • Location of the zeros of certain parametric families of functions of generalized Fresnel integral type 

      Lobo Segura, Jaime; Villalobos Arias, Mario (2019)
      In this paper, two parametric families of functions, the so-called Complementary Fresnel Integral and the Lommel type, which are of generalized Fresnel integral type, are considered. We review the problems of existence ...
    • Notas de lógica EMALCA 2019 

      Zamora Calero, Rafael (2019)
      Estas notas fueron utilizadas en el curso Introducción a la Lógica durante la EMALCA organizada por el CIMPA en la sede del Atlántico en 2019. La lógica matemática es un área de matemática que estudia el lenguaje formal ...
    • On the approximation of a virtual coarse space for domain decomposition methods in two dimensions 

      Calvo Alpízar, Juan Gabriel (2018)
      A new extension operator for a virtual coarse space is presented which can be used in domain decomposition methods for nodal elliptic problems in two dimensions. In particular, a two-level overlapping Schwarz algorithm is ...
    • On the Colmez conjecture for non-abelian CM fields 

      Barquero Sánchez, Adrián Alberto; Masri, Riad (2018-02-08)
      The Colmez conjecture relates the Faltings height of an abelian variety with complex multiplication by the ring of integers of a CM field E to logarithmic derivatives of Artin L-functions at s=0. In this paper, we prove ...
    • Parallel Sums and Adaptive BDDC Deluxe 

      Widlund, Olof B.; Calvo Alpízar, Juan Gabriel (2017)
      There has recently been a considerable activity in developing adaptive methods for the selection of primal constraints for BDDC algorithms and, in particular, for BDDC deluxe variants. The primal constraints of a BDDC or ...
    • Propuesta didáctica para la docencia universitaria de las ecuaciones polinomiales 

      Camacho Navarro, Catalina; Trejos Zelaya, Javier; Viquez Céspedes, Hernán (2017)
      En este artículo contiene los principales resultados obtenidos a partir del diseño, aplicación y evaluación de una propuesta didáctica para la enseñanza de las ecuaciones polinomiales, la cual se desarrolló durante el mes ...