Now showing items 1-20 of 116

    • Resolución de problemas matemáticos en GeoGebra 

      Poveda Fernández, William Enrique (2020)
      En este artículo se analizan y discuten las ventajas y oportunidades que ofrece GeoGebra durante el proceso de resolución de problemas. En particular, se analizan y documentan las formas de razonamiento matemático exhibidas ...
    • Estrategias asociadas al uso de GeoGebra en un contexto de resolución de problemas 

      Poveda Fernández, William Enrique; García Cuéllar, Daysi Julissa (2021-01-15)
      Este artículo presenta una experiencia en aula de matemática cuyo objetivo fue analizar cómo el uso constante de un Sistema de Geometría Dinámica (SGD), GeoGebra, en un contexto de resolución de problemas, permitió a un ...
    • 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 ...
    • Sparse bounds for Bochner–Riesz multiplers 

      Lacey, Michael T.; Mena Arias, Darío Alberto; Reguera, Maria Carmen (2019)
      The Bochner–Riesz multipliers are shown to satisfy a range of sparse bounds. The range of sparse bounds increases to the optimal range, as δ increases to the critical value, even assuming only partial information on the ...
    • 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 ...
    • 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 ...
    • Analiticity of the Lyapunov exponents of random products of quasi-periodic cocycles 

      Bezerra, Jamerson; Sánchez Chavarría, Adriana Cristina; Tall, El Hadji Yaya (2021-11-01)
      We show that the top Lyapunov exponent LE(p) associated with a random product of quasi-periodic cocycles depends real analytically on the transition probabilities p whenever LE(p) is simple. Moreover if the spectrum at ...
    • Equilibrium states for maps isotopic to Anosov 

      Álvarez, Carlos F.; Sánchez Chavarría, Adriana Cristina; Varão, Ana Régis (2021)
      In this work we address the problem of existence and uniqueness (finiteness) of ergodic equilibrium states for partially hyperbolic diffeomorphisms isotopic to Anosov on T4, with two-dimensional center foliation. To do so ...
    • Sparse bounds for the discrete spherical maximal functions 

      Kesler, Robert; Lacey, Michael T.; Mena Arias, Darío Alberto (2020)
      We prove sparse bounds for the spherical maximal operator of Magyar, Stein and Wainger. The bounds are conjecturally sharp, and contain an endpoint estimate. The new method of proof is inspired by ones by Bourgain and ...
    • 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 ...
    • 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 ...
    • Extension of torsors and prime to p fundamental group scheme 

      Antei, Marco; Calvo Monge, Jimmy José (2020)
      Let R be a discrete valuation ring with fraction field K. Let X be a proper and faithfully flat R-scheme, endowed with a section x∈X(R), with connected and reduced generic fibre Xη. Let f:Y→Xη be a finite Nori-reduced ...
    • Semimartingales on Duals of Nuclear Spaces 

      Fonseca Mora, Christian A. (2020-03-26)
      This work is devoted to the study of semimartingales on the dual of a general nuclear space. We start by establishing conditions for a cylindrical semimartingale in the strong dual Φ′ of a nuclear space Φ to have a Φ′-valued ...
    • Sur l’existence du schéma en groupes fondamental 

      Antei, Marco; Emsalem, Michel; Gasbarri, Carlo (2020-06-06)
      Soient S un schéma de Dedekind, X un S-schéma connexe localement de type ni et x 2 X(S) une section. L’objet du présent papier est d’établir l’existence du schéma en groupes fondamental de X lorsque X est à bres réduites ...
    • Erratum for “Heights of vector bundles and the fundamental group scheme of a curve” 

      Antei, Marco; Emsalem, Michel; Gasbarri, Carlo (2020-10-08)
      Corrección de datos publicados en “Heights of vector bundles and the fundamental group scheme of a curve”
    • Regularization of cylindrical processes in locally convex Spaces 

      Fonseca Mora, Christian A. (2020-12-15)
      Let Φ be a locally convex space and let Φ′ denote its strong dual. In this paper, we introduce sufficient conditions for the existence of a continuous or a càdlàg Φ′-valued version to a cylindrical process defined on Φ′. ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...