AGT - Conferencias Científicas: Envíos recientes
Mostrando ítems 41-60 de 70
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Factorization of Ideals in Leavitt Path algebras
(2017-04-04)After pointing out how ideals in a Leavitt path algebra L of a graph E behave like ideals in a commutative ring, we shall consider the question of factorizing an arbitrary ideal I as a product of finitely many special type ... -
Ordenes Locales en Álgebras de Jordan
(2017-02-16)La noción de orden local procede de los trabajos de Fountain y Gould en el caso de álgebras asociativas, y ha sido adaptada a álgebras y otros sistemas de Jordan por varios autores. En esta charla, la fuente original ... -
Leavitt path algebras and the IBN property
(2016-12-21)A ring has invariant basis number property (IBN) if any two bases of a finitely generated free module have the same number of elements. In 1960's Leavitt constructed examples of rings R without IBN, more precisely for any ... -
Estructura de anillo de la cohomología de Hoschild de álgebras de Sridharan
(2016-10-07)Sridharan probó en [Sri61] que toda álgebra filtrada cuyo graduado asociado es S(V) para algún espacio vectorial V, está determinada salvo isomorfismo por una estructura de Lie sobre V y la clase de cohomología de un ... -
Ondas Gravitacionales: el amanecer de una nueva era
(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
(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
(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
(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
(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
(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.
(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
(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
(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
(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.
(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
(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
(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
(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
(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
(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 ...