Now showing items 126-145 of 153

    • Teoría de grupos en cuantización 

      Várilly Boyle, Joseph C. (Centro de Investigación y de Estudios Avanzados del IPN, México, DF, 1992, 1992-02-15)
      Esta monografía es un curso doctoral impartido en el CInvEstAv del Instituto Politécnico Nacional en México, DF, durante el año académico 1991-92 (con licencia sabática de la UCR) y luego redactado como publicación ...
    • Teorías y propiedades universales de una teoría de anillos real cerrados (Informe Final Proyecto B9128) 

      Guier Acosta, Jorge Ignacio (2021)
      Sea $T^\ast$ la teor\'{\i}a de los subanillos reticulados que son convexos en los $f$-anillos von Neumann regulares real cerrados, y que adem\'as no tienen elementos idempotentes minimales (no-cero) y que son divisible-p ...
    • The asymptotic distribution of Andrews’ smallest parts function 

      Banks, Josiah; Barquero Sánchez, Adrián Alberto; Masri, Riad; Sheng, Yan (2015-12)
      In this paper, we use methods from the spectral theory of automorphic forms to give an asymptotic formula with a power saving error term for Andrews’ smallest parts function spt(n). We use this formula to deduce an asymptotic ...
    • The chirality theorem 

      Gracia Bondía, José M.; Mund, Jens; Várilly Boyle, Joseph C. (2018-03)
      We show how chirality of the weak interactions stems from string independence in the string-local formalism of quantum field theory.
    • The Chowla-Selberg formula for abelian CM fields and Faltings heights 

      Barquero Sánchez, Adrián Alberto; Masri, Riad (2016-03)
      In this paper we establish a Chowla-Selberg formula for abelian CM fields. This is an identity which relates values of a Hilbert modular function at CM points to values of Euler’s gamma function Γ and an analogous function ...
    • The Error in an Alternating Series 

      Villarino Bertram, Mark (2018-03)
      We present a new proof of Johnsonbaugh’s estimates for the error in an alternating series based on an idea of R. M. Young. We also use this same idea to prove the convergence of the Euler transform and a corresponding error ...
    • The Gromov’s centralizer theorem for semisimple Lie group actions 

      Rosales Ortega, José (2017-10)
      We give a new version of the Gromov’s centralizer theorem in the case of semisimple Lie group actions and arbitrary rigid geometric structures of algebraic type.
    • The Kirillov picture for the Wigner particle 

      Gracia Bondía, José M.; Lizzi, Fedele; Várilly Boyle, Joseph C.; Vitale, Patrizia (2018-06)
      We discuss the Kirillov method for massless Wigner particles, usually (mis)named "continuous spin" or "infinite spin" particles. These appear in Wigner's classification of the unitary representations of the Poincaré group, ...
    • The pseudo-fundamental group scheme 

      Antei, Marco; Dey, Arijit (2019)
      Let X be any scheme defined over a Dedekind scheme S with a given section x ∈ X (S). We prove the existence of a pro-finite S-group scheme א (X,x) and a universal א (X,x)-torsor dominating all the pro-finite pointed torsors ...
    • The role of mobility and sanitary measures on the delay of community transmission of COVID-19 in Costa Rica 

      Barboza Chinchilla, Luis Alberto; Vásquez Brenes, Paola Andrea; Mery, Gustavo; Sánchez Peña, Fabio Ariel; García Puerta, Yury Elena; Calvo Alpízar, Juan Gabriel; Rivas, Tania; Pérez Rosales, María Dolores; Salas Peraza, Daniel (2021-07-21)
      The aim of this paper is to infer the effects that change on human mobility had on the transmission dynamics during the first four months of the SARS-CoV-2 pandemic in Costa Rica, which could have played a role in delaying ...
    • The role of SARS-CoV-2 testing on hospitalizations in California 

      Montesinos López, José Cricelio; Daza Torres, María Luisa; García Puerta, Yury Elena; Barboza Chinchilla, Luis Alberto; Sánchez Peña, Fabio Ariel; Schmidt, Alec J.; Pollock, Bradley H.; Nuño, Miriam A (2021-12-03)
      The rapid spread of the new SARS-CoV-2 virus triggered a global health crisis, disproportionately impacting people with pre-existing health conditions and particular demographic and socioeconomic characteristics. One of ...
    • The role of short-term immigration on disease dynamics: An SIR model with age-structure 

      Sánchez Peña, Fabio Ariel; Calvo Alpízar, Juan Gabriel (2019-02-18)
      We formulate an age-structured nonlinear partial differential equation model that features short-term immigration effects in a population. Individuals can immigrate into the population as any of the three stages in the ...
    • The set of fiber-bunched cocycles with nonvanishing Lyapunov exponents over a partially hyperbolic map is open 

      Backes, Lucas Henrique; Poletti, Mauricio; Sánchez Chavarría, Adriana Cristina (2018)
      We prove that the set of fiber-bunched SL(2, R)-valued Hölder cocycles with nonvanishing Lyapunov exponents over a volume preserving, accessible and center-bunched partially hyperbolic diffeomorphism is open. Moreover, we ...
    • The significance of physiologically structured models for fish stock dynamics 

      Gracia Bondía, José M.; Várilly Boyle, Joseph C. (1988)
      The present working document contains the initial papers of a series whose ultimate purpose is to provide a realistic basis for a fresh appraisal of both the surplus production and the dynamic pool approaches to fishery ...
    • The Stratonovich-Weyl correspondence: A general approach to Wigner functions 

      Várilly Boyle, Joseph C. (1989)
      A formalism is proposed for developing phase-space representations of elementary quantum systems under general invariance groups. Several examples are discussed, including the usual Weyl calculus, the Moyal formulation ...
    • The Wigner transformation is of finite order 

      Várilly Boyle, Joseph C.; Gracia Bondía, José M. (1987-05)
      The Wigner integral transformation, which intertwines the twisted product and the composition of kernels, is of order 24. Indeed, it commutes with, and its sixth power equals, the Fourier cotransformation.
    • Theta series and number fields: theorems and experiments 

      Barquero Sánchez, Adrián Alberto; Mantilla Soler, Guillermo; Ryan, Nathan C. (2021-03-01)
      Let d and n be positive integers and let K be a totally real number field of discriminant d and degree n. We construct a theta series $\theta_K \in \mathcal{M}_{d, n}$ where $\mathcal{M}_{d, n}$ is a space of modular forms ...
    • Transmission dynamics of Dengue in Costa Rica: The role of hospitalizations 

      Sánchez Peña, Fabio Ariel; Arroyo Esquivel, Jorge; Vásquez Brenes, Paola Andrea (2019-12)
      For decades, dengue virus has caused major problems for public health officials in tropical and subtropical countries around the world. We construct a compartmental model that includes the role of hospitalized individuals ...
    • Tres caminos hacia la geometría elemental 

      Várilly Boyle, Joseph C. (Congreso CANP 2012: "Construcción de Capacidades en Matemáticas y Educación Matemática", 2012-08)
      La enseñanza de la geometría a nivel preuniversitaria suscita debates sobre su fundamentación, su puesta en práctica y su engranaje con otros áreas de la matemática. Aquí se ofrecen algunas ideas para explorar de qué ...
    • Uniform sparse bounds for discrete quadratic phase Hilbert transforms 

      Kesler, Robert; Mena Arias, Darío Alberto (2017-09)
      Consider the discrete quadratic phase Hilbert Transform acting on $\ell^{2}(\mathbb{Z})$ finitely supported functions $$ H^{\alpha} f(n) : = \sum_{m \neq 0} \frac{e^{i\alpha m^2} f(n - m)}{m}. $$ We prove that, ...