Noticias en español
Seminars appear in decreasing order in relation to date. To find an activity of your interest just go down on the list. Normally seminars are given in English. If not, they will be marked as Spanish Only.
Modeling Population Dynamics with PDEs? SIPodemos!
Summary: In this talk, I will present some facets of the best known equation in reaction-diffusion, which is called the Fisher KPP equation. I will explain where it comes from and what kind of results are interesting for mathematicians. Nobody needs knowledge in PDEs, the only thing to know is what is a Laplacian in R^d, or partial derivatives of order 2.
Familias test para comprobar la promediabilidad de grupos residualmente finitos.
RESUMEN: Un clásico resultado establece que un grupo numerable G es promediable (amenable), si y sólo si toda acción continua de G sobre un espacio métrico compacto admite medidas de probabilidad invariantes. Motivados por esta caracterización de promediabilidad, Giordano y de la Harpe mostraron que para testear promediabilidad de un grupo G, basta con estudiar las acciones continuas de G sobre el Cantor. En otras palabras, probaron que las acciones continuas sobre el Cantor son una familia test para la promediabilidad de un grupo...
Análisis de áreas quemadas a partir de imágenes de sensores remotos en el Parque Estadual do Cocó (Fortaleza, Brasil)
Expositor: Mauricio Perea, ingeniero forestal y estudiante de doctorado en Geografía de la Universidade Federal do Ceará (Brasil). Fecha y hora: viernes 19 de abril, 12:00 hrs. de Chile (16:00 UTC). Resumen: El Parque Estadual do Cocó (PEC), situado en Fortaleza, capital del estado de Ceará, representa la mayor reserva urbana del Norte/Nordeste de Brasil y la cuarta en extensión en América Latina. Sin embargo, enfrenta diversos desafíos que comprometen su biodiversidad y su función ecológica. Estos incluyen incendios forestales, la expansión...
Análisis de áreas quemadas a partir de imágenes de sensores remotos en el Parque Estadual do Cocó, Región Metropolitana de Fortaleza (Ceará).
Resumen: El Parque Estadual do Cocó (PEC), situado en Fortaleza, capital del estado de Ceará, representa la mayor reserva urbana del Norte/Nordeste de Brasil y la cuarta en extensión en América Latina. Sin embargo, enfrenta diversos desafíos que comprometen su biodiversidad y su función ecológica. Estos incluyen incendios forestales, la expansión descontrolada de áreas urbanas, la fragmentación del hábitat debido al desarrollo de infraestructuras y carreteras, así como la contaminación del agua y del suelo, además de presiones derivadas de...
Sharp large deviation principles for descents of random permutations.
Resumen: A permutation $\pi_n$ of size $n$ is said to have a descent at position $k$ if $\pi_n(k) > \pi_n(k + 1)$. We define $D_n$ as the number of descents of $\pi_n$, and $D_n’$ as the number of descents of $\pi_n^{-1}$, the inverse permutation of $\pi_n$. In this talk, I will present recent developments regarding the sharp large deviations for $D_n$ and for the pair $(D_n, D_n’)$, along with other probabilistic results when $\pi_n$ is taken uniformly at random from $S_n$, the set of permutations of size $n$. Work in...
Characterisation of the Set of Ground States of Uniformly Chaotic Finite-Range Lattice Models.
RESUMEN: The study of statistical physics models allows mathematics to offer another perspective on empirically observable phenomena. A point of interest is in particular the behavior of these models when the temperature tends towards 0, analogous to the emergence of complex crystal structures in materials. A way to model that is to consider tiling defined by local rules where some matching rules can be broken proportionally to a parameter which is the inverse of the temperature. This correspond to the Gibbs measure of the system and we are...
Abstract: In this talk, I will give an introduction to linear programming hierarchies, with a particular focus on the hierarchy by Sherali & Adams. I will discuss some limitations of the tool, but also ways to get useful and stronger relaxations.
Summary: In this talk, we will briefly introduce the nonlinear elasticity equations to understand the language of large deformations modeling. After this, we will focus on the much less studied “Inverse Elasticity Problem”, whose solution is sometimes referred to as the reference configuration, or stress-free configuration. This problem can be stated as follows: Given a set of known external forces and a *deformed* configuration, find an initial (or reference) configuration such that, when the given forces are applied to it, we...
