Now showing items 108-127 of 230

    • 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 ...
    • Location of the zeros of certain parametric families of functions of generalized Fresnel integral type 

      Lobo Segura, Jaime; Villalobos Arias, Mario Alberto (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 ...
    • Lyapunov exponents of probability distributions with non-compact support 

      Sánchez Chavarría, Adriana Cristina; Viana, Marcelo (2020)
      A recent result of Bocker–Viana asserts that the Lyapunov exponents of compactly supported probability distributions in GL(2, R) depend continuously on the distribution. We investigate the general, possibly concompact ...
    • Mathematical and Statistical models as tools for the control ofmosquito-borne diseases: The experience of Costa Rica 

      Sánchez Peña, Fabio Ariel; Barboza Chinchilla, Luis Alberto; Vásquez Brenes, Paola Andrea; García Puerta, Yury Elena; Calvo Alpízar, Juan Gabriel; Chou Chen, Shu Wei; Mery Valdovinos, Gustavo Andrés (2021-06-25)
      The modeling of infectious diseases provides valuable input in the development of mitigating strategies and implementation of public health interventions. We highlight results and current research conducted in Costa Rica ...
    • Metric properties of the fuzzy sphere 

      D'Andrea, Francesco; Lizzi, Fedele; Várilly Boyle, Joseph C. (2013-02)
      The fuzzy sphere, as a quantum metric space, carries a sequence of metrics which we describe in detail. We show that the Bloch coherent states, with these spectral distances, form a sequence of metric spaces that converge ...
    • Métodos de particionamiento bimodal y trimodal 

      Castillo Elizondo, William (1999)
    • Minimum depth of double cross product extensions 

      Hernández Alvarado, Alberto José (2020)
      In this paper we explore minimum odd and minimum even depth sub- algebra pairs in the context of double cross products of finite dimensional Hopf algebras. We start by defining factorization algebras and outline how subring ...
    • Modeling the university drinking culture phenomenon 

      Serracín Morales, Alisson; Herrera Garro, César; Sánchez Peña, Fabio Ariel (2022-11-03)
      We study a susceptible-drinker-recovered (SDR) model for the drinking culture phenomenon in university atmospheres. We find conditions for this model to have extinction and endemic equilibrium points. We analyze different ...
    • Models of torsors and the fundamental group scheme 

      Antei, Marco; Emsalem, Michel (2018)
      Given a relative faithfully at pointed scheme over the spectrum of a discrete valuation ring X !S, this paper is motivated by the study of the natural morphism from the fundamental group scheme of the generic ber X ...
    • Models of torsors over affine spaces 

      Antei, Marco; Esquivel Araya, Jorge Arturo (2019)
      Let X := A n R be the n-dimensional affine space over a discrete valuation ring R with fraction field K. We prove that any pointed torsor Y over A n K under the action of an affine finite-type group scheme can be extended ...
    • Moyal planes are spectral triples 

      Gayral, Victor; Gracia Bondía, José M.; Iochum, Bruno; Schücker, Thomas; Várilly Boyle, Joseph C. (2004-04)
      Axioms for nonunital spectral triples, extending those introduced in the unital case by Connes, are proposed. As a guide, and for the sake of their importance in noncommutative quantum field theory, the spaces R^2N endowed ...
    • Moyal quantization with compact symmetry groups and noncommutative harmonic analysis 

      Figueroa González, Héctor; Gracia Bondía, José M.; Várilly Boyle, Joseph C. (1990)
      The phase-space approach to quantization of systems whose symmetry group is compact and semisimple is developed from two basic principles: covariance and traciality. This generalizes results and methods already implemented ...
    • New mixed finite element methods for natural convection with phase-change in porous media 

      Álvarez Guadamuz, Mario Andrés; Gatica Pérez, Gabriel Nibaldo; Gómez Vargas, Bryan Andrés; Ruiz Baier, Ricardo (2019)
      This article is concerned with the mathematical and numerical analysis of a steady phase change problem for non-isothermal incompressible viscous flow. The system is formulated in terms of pseudostress, strain rate and ...
    • Noncommutative geometry and quantization 

      Várilly Boyle, Joseph C. (2000-06)
      We examine some recent developments in noncommutative geometry, including spin geometries on noncommutative tori and their quantization by the Shale-Stinespring procedure, as well as the emergence of Hopf algebras as a ...
    • Nonnegative mixed states in Weyl–Wigner–Moyal theory 

      Gracia Bondía, José M.; Várilly Boyle, Joseph C. (1988-03-21)
      We classify the gaussian Wigner functions corresponding to mixed states and show that, unlike the case of pure states, not all nonnegative mixed states are gaussian.
    • Nori fundamental gerbe of essentially finite covers and Galois closure of towers of torsors 

      Antei, Marco; Biswas, Indranil; Emsalem, Michel; Tonini, Fabio; Zhang, Lei (2019)
      We prove the existence of a Galois closure for towers of torsors under finite group schemes over a proper, geometrically connected and geometrically reduced algebraic stack X over a field k. This is done by describing the ...