Mostrando ítems 21-40 de 46

    • Ondas Gravitacionales: el amanecer de una nueva era 

      Martín Senovilla, José María (2016-09-13)
      Después de una larga espera de decenas de años estamos de enhorabuena: el 14 de Septiembre de 2015 una colaboración científica internacional (LIGO/VIRGO) logró detectar, en sus interferómetros más avanzados en funcionamiento, ...
    • Reconstruction of graded groupoids from graded Steinberg algebras 

      Ara, Pere (2016-05-19)
      We show how to reconstruct a graded ample Hausdorff groupoid with topologically principal neutrally-graded component from the ring structure of its graded Steinberg algebra over any commutative integral domain with 1, ...
    • Homeomorphism groups of the cube and other n-manifolds 

      Rolfsen, Dale; Calegari, Danny (2016-04-25)
      In this talk, the structure of the homeomorphism group of the cube is presented. Applications to the homeomorphism groups of other n-manifolds are also treated.
    • Connectivity by geodesics on a class of globally hyperbolic spacetimes 

      Bartolo, Rosella (2016-04-14)
      During the past years there has been a considerable amount of research related to the problem of geodesic connectedness of Lorentzian manifolds. This topic has wide applications in Physics, but for mathematicians its ...
    • C*-algebras associated to Boolean dynamical systems 

      Pardo Espino, Enrique (2016-03-15)
      The goal of this talk is to present the C*-algebra $C^*(\mathcal{B}, \mathcal{L}, \theta)$ of a Boolean dynamical system $(\mathcal{B}, \mathcal{L}, \theta)$, that generalizes the $C^*$-algebra associated to a labelled ...
    • Groupoids and Steinberg Algebras 

      Clark, Lisa Orloff (2016-03-15)
      A groupoid is a generalisation of group in which composition is only partially defined. In first half of this talk, I will give an overview of groupoid theory and show how groupoids provide a unifying model for a number ...
    • Extensión global de campos vectoriales locales en espacios Pseudo-Finsler I, II. 

      Herrera Fernández, Jónatan (2016-02-24)
      El problema de extensión global de campos locales (Killing, conformes, etc.) en variedades Pseudo-Riemannianas aparece naturalmente en múltiples contextos. Por ejemplo, es un ingrediente esencial en la prueba de que el ...
    • Complejidad topológica abstracta en categorías de modelos sobre espacios topológicos 

      Moraschini, Marco (2015-10-19)
      En esta charla vamos a estudiar el comportamiento de la complejidad topológica abstracta en diferenties estructuras de modelos sobre los espacios topológicos. En particular, vamos a estudiar bajo que hipótesis el valor de ...
    • Infinite-Dimensional Diagonalization 

      Mesyan, Zachary; Reyes, Manuel; Iovanov, Miodrag (2015-05-29)
      Let V be an arbitrary vector space over a field K, and let End(V) be the ring of all K-linear transformations of V. We characterize the diagonalizable linear transformations in End(V), as well as the (simultaneously) ...
    • Incidence algebras. Overview 

      Muge, Kanuni (2015-05-13)
      In his celebrated paper of 1964, "On the foundations of combinatorial theory I: Theory of Möbius Functions" Gian-Carlo Rota defined an incidence algebra as a tool for solving combinatorial problems. Incidence algebra is a ...
    • Perspectiva. Espacios construidos y espacios representados. 

      López Vílchez., Inmaculada (2015-04-24)
      La conferencia presentará los fundamentos científicos de la perspectiva, conocida tradicionalmente como “la ciencia del arte”, con la mención de los que han sido considerados sus principales referentes en el contexto ...
    • Maximal surfaces and graphs in a Lorentzian product -RxM 

      Lima Jr., Eraldo A. (2015-02-26)
      We will present several results for maximal surfaces in a Lorentzian product manifold -R×M. The main purpose is to characterize the slices as complete maximal surfaces satisfying a comparison between the growth of lenght ...
    • Módulos graduados e invariantes de Brauer 

      Elduque, Alberto (2014-12-10)
      Dado un módulo irreducible de dimensión finita para un álgebra de Lie semisimple graduada sobre un cuerpo algebraicamente cerrado de característica cero, se estudiarán las obstrucciones que existen para la existencia de ...
    • Extremal elements in Lie Algebras 

      Cohen, Arjeh M. (2014-12-10)
      The main result discussed in this lecture is an elementary proof of the following theorem: If L is a simple Lie algebra over F of characteristic distinct from 2 and 3 having an extremal element that is not a sandwich, ...
    • Rigid singularity theorems in Lorentzian Geometry 

      Costa e Silva, Ivan P. (2014-10-02)
      The importance of the singularity theorems in Lorentzian Geometry, which give su cient conditions on a spacetime entailing the incompleteness of its null or timelike geodesics, is well known. But equally important is to ...
    • Geometric assumptions and variational tools in Lorentzian geometry 

      Candela, Anna Maria (2014-10-02)
      During the past years there has been a considerable amount of research related to the problem of geodesic connectedness of Lorentzian manifolds. In particular, some geometric sufficient conditions have been introduced so ...
    • Primitive graph algebras 

      Abrams, Gene (2014-06-18)
      Let $E = (E^0, E^1, s,r)$ be an arbitrary directed graph (i.e., no restriction is placed on the cardinality of $E^0$, or of $E^1$, or of $s^{-1}(v)$ for $v\in E^0$). Let $L_K(E)$ denote the Leavitt path algebra of ...
    • ¿Tiene sexo la mente? 

      Muñoz Páez, Adela (2014-05-13)
      La respuesta obvia es: NO. Pero entonces ¿por qué no aparecen mujeres en la historia de la ciencia? Si revisamos la historia con otros ojos, encontramos que las mujeres han tenido papeles muy relevantes en la ciencia y la ...
    • Un tratamiento unificado para álgebras de Katsura y álgebras de Nekrashevych 

      Pardo Espino, Enrique (2014-04-22)
      En esta charla se hará una breve presentación de las C*-álgebras de Katsura y las C*-álgebras de Nekrashevych. Tras ella, se definirá una clase de C*-álgebras conteniendo ambas clases, y se presentarán como C*-álgebras de ...
    • Endoregular Modules 

      Rizvi, Tariq (2014-04-02)
      We will discuss modules whose endomorphism rings are von Neumann regular, which we call endoregular modules. Characterizations and properties of endoregular modules will be presented. For example, it is shown that a direct ...