Listar Álgebra, Geometría y Topología - (AGT) por título
Mostrando ítems 15-34 de 141
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Best rank-k approximations for tensors: generalizing Eckart-Young
Tocino-Sánchez, Alicia
(2020-02-03)
Joint work with Jan Draisma and Giorgio Ottaviani. Given a tensor f in a Euclidean tensor space, we are interested in the critical points of the distance function from f to the set of tensors of rank at most k, which we ... -
Braid of braids groups and evolution algebras.
(UMA Editorial, 2024)The purpose of this Thesis is to develop the theory of braid of braids and twin of twin groups. We investigate some of their fundamental structural aspects in detail. We will attach particular importance to the reduced ... -
Butterfly, Möbius, and Double Burnside algebras of noncyclic finite groups
(2018-03-09)The double Burnside ring B(G,G) of a finite group G is the Grothendieck ring of finite (G,G)-bisets with respect to the tensor product of bisets over G. Many invariants of the group G, such as the (single) Burnside ring ... -
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 ... -
Cálculos en cohomología de grupos finitos.
(2023)Sea p un número primo. En esta charla daremos una introducción a la cohomología de p-grupos finitos sobre el cuerpo de p elementos y descubriremos lo difícil que puede resultar su cálculo. -
Categorías tensoriales, álgebras y superálgebras
(2022)After reviewing the basic definitions of tensor categories and the notion of semisimplification of symmetric tensor categories, it will be shown how the semisimplification of the category of representations of the cyclic ... -
Classification of fiber sequences with a prescribed holonomy action
(Elsevier, 2022-08-01)We define H-fibration sequences as fibrations where the holonomy action of the fundamental group of the base on the fiber lies in a given subgroup H of E(F ), where E(F ) is the homotopy automorphism group of the fiber. ... -
Classification of leavitt path algebras with two vertices
Kanuni, Müge; Martín-Barquero, Dolores; Martín-González, Cándido; Siles-Molina, Mercedes (Independent University of Moscow, 2019-07)
We classify row-finite Leavitt path algebras associated to graphs with no more than two vertices. For the discussion we use the following invariants: decomposability, the K0 group, detpNE1 q (included in the Franks ... -
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 ... -
Con ocho basta
Draper-Fontanals, Cristina (2022)
En esta charla hablaremos de las descripciones y particularidades de los 8 hijos del grupo de Lie compacto G_2=Aut(O), o sea, de sus cocientes reductivos. La foto de familia permitirá entender mejor la relación entre ... -
Conjugacy of subshifts via the associated algebras.
(2024)In this talk, we present the recently defined unital algebra associated with a one-sided subshift over an arbitrary alphabet. For finite alphabets, the C*-algebraic version of this algebra coincides with the C*-algebra ... -
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 ... -
Conocimiento y aplicación de la responsabilidad social empresarial en Chile
(Universidad de Málaga, Servicio de Publicaciones y Divulgación Científica, 2013)Esta investigación se centra en el estudio de la Responsabilidad Social Empresarial en Chile. La muestra la conforman 25 empresas, las entidades gremiales de empresarios, la Organización Internacional del Trabajo y ... -
Contact structures on null hypersurfaces
Atindogbé, Cyriaque; Gutiérrez-López, Manuel; Hounnonkpe, Raymond; Olea, Benjamín (Elsevier, 2022-08)
The aim of this paper is to show how we can induce contact structures, contact metric structures and Sasaki structures on a null hypersurface from a rigging vector field. We give several explicit examples of this construction ... -
Context-Equivalence of Algebras with Involutions.
(2023)Morita equivalence is the central concept of celebrated Morita theory. Two algebras are Morita equivalent if their categories of modules are equivalent. A Morita context is a useful technical concept that allows one to ... -
Cuantización geométrica y Geometría de Lorentz
(2019-10-07)En esta charla el autor presenta el problema de la inexistencia de una medida de Borel localmente finita que sea preservada por los flujos Hamiltonianos asociados a un conjunto restringido de funciones, para la forma ... -
Decompositions of endomorphisms into a sum of roots of the unity and nilpotent endomorphisms of fixed nilpotence.
Danchev, Peter; García González, Esther; Gómez-Lozano, Miguel Ángel (Elsevier, 2023-07-10)
For n ≥ 2 and fixed k ≥ 1, we study when an endomorphism f of Fn, where F is an arbitrary field, can be decomposed as t + m where t is a root of the unity endomorphism and m is a nilpotent endomorphism with mk = 0. For ... -
Decompositions of matrices into a sum of invertible matrices and matrices of fixed nilpotence.
Danchev, Peter; García González, Esther; Gómez-Lozano, Miguel Ángel (International Linear Algebra Society, 2023-08-24)
For any n ≥ 2 and fixed k ≥ 1, we give necessary and sufficient conditions for an arbitrary nonzero square matrix in the matrix ring Mn(F) to be written as a sum of an invertible matrix U and a nilpotent matrix N with Nk ... -
Derivaciones y derivaciones generales de las álgebras no asociativas
(2018-01-15)El resultado clásico de Jacobson es seguinte: una álgebra de Lie de dimención finita con una derivación inversible sobre un cuerpo del caracteristica cero es una álgebra nilpotente. Nosotros vamos a hablar sobre posibles ... -
Determinación algorítmica de estructuras Hopf Galois
(2018-10-15)La teoría Hopf-Galois es una generalización de la teoría de Galois. La clave es sustituir los grupos de Galois por álgebras de Hopf y la acción de Galois por una cierta “acción de Hopf” que actúa por endomorfismos. Este ...