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.
An optimal algorithm for strict circular seriation.
Abstract: Seriation is an exploratory combinatorial data analysis technique to reorder objects into a sequence along a one-dimensional continuum when the only available information among the objects is their pairwise similarity (or dissimilarity). Linear seriation aims at inferring an ordering (permutation) consistent with an underlying linear order of the data. In many cases however, the data objects may be arranged around a closed continuum yielding a rather circular underlying order. In a matrix representation, this can be visualized as a...
Conjetura de Ryser en hipergrafos t-intersectantes.
Resumen: La conjetura de Ryser establece que el número de cover de un hipergrafo r-partito r-uniforme es a lo más (r-1) veces el tamaño de su número de matching. En esta charla, revisaremos avances recientes en cotas para la conjetura en hipergrafos t intersectantes dadas ciertas restricciones asociadas a r y t.
On diametrically maximal sets, maximal premonotone maps and premonotone bifunctions.
Abstract: First, we study diametrically maximal sets in the Euclidean space (those which are not properly contained in a set with the samediameter), establishing their main properties. Then, we use these sets for exhibiting an explicit family of maximal premonotone operators. We also establish some relevant properties of maximal premonotone operators, like their local boundedness, and finally we introduce the notion of premonotone bifunctions, presenting a canonical relation between premonotone operators and bifunctions, that extends the well...
Conjuntos Asintóticamente Seccional-Hiperbólicos.
ABSTRACT: La noción de conjunto Asintóticamente Seccional-Hiperbólico fue introducida en [1] por C. Morales y B. San Martín. La principal característica que presentan estos conjuntos es que cualquier punto fuera de las variedades estables de sus singularidades (las cuales son hiperbólicas) poseen tiempos hiperbólicos arbitrariamente grandes. Ejemplos de sistemas que verifican esta clase de hiperbolicidad son la Herradura Singular Contractiva [1], el atractor exhibido en [2] y el atractor de Rovella [3]. En esta charla se presentarán algunas...
Apportionment Mechanisms under Parity Constraints and the case of Chile and a new Political Constitution.
Abstract: How many seats should be allocated to each political party in an election? This question has a long and rich history, and plays a fundamental role in order to ensure appropriate levels of representation in the parliaments. We consider this question in the presence of types (e.g. men and women), where apart from ensuring proportionality at the party level, we also have to find an allocation which is paritary for the types. We consider two different approaches: one of them, with a greedy/local search paradigm, corresponds to a...
Boundedness of hyperbolic components in moduli space.
ABSTRACT: A complex rational map of degree at least 2 is hyperbolic if each of its critical points is attracted to an attracting cycle. For a fixed degree, the hyperbolic rational maps form an open set in the space of rational maps. This open set deduces an open set in the moduli space of rational maps, modulo the Möbius conjugacy. Each component of the deduced open set is a hyperbolic component. In this talk, I will present some precompactness results on hyperbolic components. In particular, I will focus on the space of quartic Newton maps....
Asymptotics for 1D Klein-Gordon equations with variable coefficient quadratic nonlinearities.
Abstract: The problem of the asymptotic stability of kinks in classical nonlinear scalar field equations on the real line leads to the study of the decay of small solutions to 1D Klein-Gordon equations with variable coefficient quadratic nonlinearities. I will discuss the occurrence of a novel modified scattering behavior of such solutions that involves a logarithmic slow-down of the decay rate along certain rays. It is caused by a striking resonant interaction between specific spatial frequencies of the variable coefficient and the temporal...
Datos Copernicus en nuevos trabajos científicos sobre aplicaciones marinas para Chile.
Participación en Linea: http://vcespresso.redclara.net/@352109705c115cdd511fb968f9f4ff86# Use Explorer, Firefox o Safari.
