• Groups definable in partial differential fields with an automorphism 

      Bustamante Medina, Ronald F.; Chatzidakis, Zoé; Montenegro Guzmán, Samaria (2021-09-28)
      In this paper we study groups definable in existentially closed partial differential fields of characteristic 0 with an automorphism which commutes with the derivations. In particular, we study Zariski dense definable ...
    • 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.
    • Los grupos clásicos y su clasificación 

      Várilly Boyle, Joseph C. (Coloquios de Matemática., 2011-08-10)
      Esta es la memoria de un coloquio en la Escuela de Matemática, el 10 de agosto del 2011, en la ocasión de la visita a la UCR del Profesor Luis Joaquín Boya, de Zaragoza. Es un bosquejo de la clasificación de los grupos ...
    • Los grupos simplécticos y su representación en la teoría del producto cuántico. I. Sp(2,R) 

      Várilly Boyle, Joseph C.; Gracia Bondía, José M. (1987)
      El álgebra de observables de la teoría cuántica encierra una representación del grupo simpléctico. Esta puede usarse a su vez para resolver problemas de caracterización de estados y síntesis espectral en la formulación ...
    • Heat content estimates over sets of finite perimeter 

      Acuña Valverde, Luis Guillermo (2016-09)
      This paper studies by means of standard analytic tools the small time behavior of the heat content over a bounded Lebesgue measurable set of finite perimeter by working with the set covariance function and by imposing ...
    • Hopf algebras in noncommutative geometry 

      Várilly Boyle, Joseph C. (2003)
      We give an introductory survey to the use of Hopf algebras in several problems of noncommutative geometry. The main example, the Hopf algebra of rooted trees, is a graded, connected Hopf algebra arising from a universal ...
    • 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 ...
    • Implementación de una plataforma computacional para la solución de PDE's elípticas, mediante FEM y descomposición de dominios BDDC. 

      Mora Cordero, Fabian (2019)
      En este trabajo se desarrolla una plataforma computacional en C++-CUDA, la cual introduce una serie de estructuras de datos que simplifican el manejo de memoria en CUDA. En la plataforma también se introducen elementos de ...
    • Improved Automatic Centerline Tracing for Dendritic and Axonal Structures 

      Jiménez López, David Adrián; Labate, Demetrio; Kakadiaris, loannis A.; Papadakis, Manos (2015-04)
      Centerline tracing in dendritic structures acquired from confocal images of neurons is an essential tool for the construction of geometrical representations of a neuronal network from its coarse scale up to its fine scale ...
    • Improved Epstein-Glaser renormalization in x-space versus differential renormalization 

      Gracia Bondía, José M.; Gutiérrez Garro, Heidy; Várilly Boyle, Joseph C. (2014-09)
      Renormalization of massless Feynman amplitudes in x-space is reexamined here, using almost exclusively real-variable methods. We compute a wealth of concrete examples by means of recursive extension of distributions. This ...
    • Incorporating variable viscosity in vorticity-based formulations for Brinkman equations 

      Anaya Domínguez, Verónica; Gómez Vargas, Bryan Andrés; Mora Herrera, David; Ruiz Baier, Ricardo (2019-06)
      In this brief note, we introduce a non-symmetric mixed finite element formulation for Brinkman equations written in terms of velocity, vorticity, and pressure with non-constant viscosity. The analysis is performed by the ...
    • Indirect inference for locally stationary ARMA processes with stable innovations 

      Chou Chen, Shu Wei; Morettin, Pedro A. (2020)
      The class of locally stationary processes assumes that there is a time-varying spectral representation, that is, the existence of finite second moment. We propose the α-stable locally stationary process by modifying the ...
    • Infection model for analyzing biological control of coffee rust using bacterial anti-fungal compounds 

      Arroyo Esquivel, Jorge; Sánchez Peña, Fabio Ariel; Barboza Chinchilla, Luis Alberto (2019-01)
      Coffee rust is one of the main diseases that affect coffee plantations worldwide (Cressey, 2013 [10]). This causes an important economic impact in the coffee production industry in countries where coffee is an important ...
    • Integral y primitivas de Riemann 

      Alarcón Athens, Winston (1991)
      Hacemos un breve estudio de una generalización de la noción de primitiva, que se corresponde exactamente con la integral de Riemann. Obtenemos una caracterización de la integrabilidad en el sentido de Riemann, que produce ...
    • 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 ...
    • Laboratorio de matemática: Fascículo #1 

      Rodríguez Alfaro, Analive (Universidad de Costa Rica. Sede de Occidente, 1992, 1992)
      Este fascículo consiste en una serie de guías para utilizar los modelos didácticos correspondientes a diversos conceptos matemáticos incluidos en los programas de los cursos de la enseñanza primaria y secundaria. Incluye ...
    • Lacunary discrete spherical maximal functions 

      Kesler, Robert; Lacey, Michael T.; Mena Arias, Darío Alberto (2019)
      We prove new l^p(Z^d) bounds for discrete spherical averages in dimensions d greater than or equal to 5. We focus on the case of lacunary radii, first for general lacunary radii, and then for certain kinds of highly ...
    • Ley de grandes números en medio ambiente aleatorio 

      Acuña Larios, Jennifer (2020)
      Las condiciones (T)γ,γ ∈ (0,1) introducidas por Sznitman en 2002 tienen un significante impacto en el estudio de caminatas aleatorias sobre medios aleatorios (RWRE) . Este tipo de caminatas modelan, por ejemplo, el movimiento ...
    • Local divisibility and model completeness of a theory of real closed rings 

      Guier Acosta, Jorge Ignacio (2021-01)
      Let T∗ be the theory of lattice-ordered rings convex in von Neumann regular real closed f-rings, without minimal idempotents (non zero) that are divisible-projectable and sc-regular. I introduce a binary relation describing ...