2015-04-10

Stephen Griffeth. Universidad de Talca
Catalan Combinatorics, Algebraic Geometry, and Representation Theory
Sala 2 (Víctor Ochsenius) Facultad de Matemáticas - 16:00 Hrs.

2015-03-27

Antonio Laface. Universidad de Concepción
Cox Rings
Sala 2 (Víctor Ochsenius) Facultad de Matemáticas - 16:00 Hrs.

2015-03-02

Sam Payne. Yale University
Algebraic Curves, Tropical Geometry, and Moduli
Sala 2 (Víctor Ochsenius) Facultad de Matemáticas - 16:00 Hrs.

2015-01-22

Martin Sombra. Icrea & Universitat de Barcelona, Spain
Point-Hypersurfaces Incidences
Sala 2 (Víctor Ochsenius) Facultad de Matemáticas

2014-09-26

Marius Mantoiu. Universidad de Chile
C*-Algebras y Calculo Pseudodifferential
Sala 2 (Víctor Ochsenius) Facultad de Matemáticas - 16:00 Hrs.

2014-09-26

Marius Mantoiu. Universidad de Chile
C*-Algebras y Calculo Pseudodifferential
Sala 2 (Víctor Ochsenius) Facultad de Matemáticas - 16:00 hRS

2014-09-12

José Verschae. Pontificia Universidad Católica de Chile
Tight and Approximate Relaxations for Assignment Problems
Sala 2 (Víctor Ochsenius) Facultad de Matemáticas - 16:00 Hrs,

2014-09-05

Sukhendu Mehrotra. P. Universidad Católica de Chile
Solutions of Polynomial Equations Over Finite Fields
Sala 2 (Víctor Ochsenius) Facultad de Matemáticas - 16:00 Hrs.

2014-08-22

Jairo Bochi. P. Universidad Católica de Chile
Curvas de Peano Con Huellas Suaves
Sala 2 (Víctor Ochsenius) Facultad de Matemáticas - 17:00 Hrs.

2012-11-29

Enno Nagel. (Jussieu)
Fractional derivatives in p-adic analysis
Sala 2 (Víctor Ochsenius)- Facultad de Matemáticas - 14:00 Hrs.
Abstract:
Abstract: Motivated by their appearance in the p-adic Langlands program, I firstly introduce by elementary means, for a real number r>=0, the notion of an r-times differentiable function over a p-adic number field and present their basic properties. If time permits, I will then discuss their role in Number Theory and show how they entered the scene as completions of certain locally algebraic representations.

2012-03-16

Igor Dolgachev. University of Michigan
Automorphism groups of algebraic surfaces
Auditorio Ninoslav de la PUC - 15:00 Hrs.
Abstract:
Abstract: I will survey some recent and old results about automorphism groups of complex algebraic surfaces with special emphasis on rational, Enriques and K3 surfaces

2012-03-16

Alvaro Liendo. Mathematisches Institut, Universitat Bern
The automorphism group of a T-variety of complexity one
Auditorio Ninoslav Bralic - 16:10 Hrs
Abstract:
A T-variety is a normal variety endowed with a faithful action of the algebraic torus T=(k^*)^n. The complexity of a T-variety is the codimension of a generic orbit. The best known examples of T-varieties are toric varieties, i.e., T-varieties of complexity 0.

In the first part of this talk, we present a combinatorial description of T-varieties given by Almann, Hausen and Süss in 2006. This description generalizes the usual description of toric varieties by means of fans to higher complexity. In the second part of this talk, we will discuss a recent result where we compute the root system of the automorphism group of a rational complete T-variety of complexity one.

2011-04-11

Kazim Buyukboduk. Koc University de Estambul
Zeta-functions and arithmetic
Sala 2 (Víctor Ochsenius) - 14:30 Hrs. Facultad de Matemáticas - UC
Abstract:
The purpose of this expository talk is to discuss a fundamental theme in modern Number Theory: The relation between zeta-functions (objects of analytic nature) and certain objects of arithmetic nature (which we generally call Selmer groups). Kummer was first to recognize the arithmetic significance of the special values of the classical zeta-function, using which he was able to deduce a non-trivial portion of the Fermat´s Last Theorem". Kummer´s ideas were much later generalized by Ribet and Wiles (in a certain sense) to conclude with the full proof. An important portion of this talk will be devoted to explaining Kummer´s ideas, and if time permits, say a few words about their influence in modern day number theory.

"

2009-06-03

Jouni Rättyä. Universidad de Joensuu, Finlandia
Ecuaciones Diferenciales Lineales en el Disco: Ceros y Crecimiento
Sala 2 (Vìctor Ochsenius) - Facultad de Matemáticas - 16:30 Hrs.

2008-11-19

John Carter. Seattle University, Washington, Usa
Higher-order symplectic numerical methods for PDEs
Auditorio Ninoslav Bralic -15:00 Hrs - Facultad de Matemáticas
Abstract:
Abstract: Many classic partial differential equations, such as the nonlinear
Schrödinger equation and the Korteweg–de Vries equation, have underlying
Hamiltonian structure. Preserving this property in numerical
simulations is important, especially for long-time evolution. We will
discuss a method for constructing operator-splitting-based high-order
numerical methods that preserve the Hamiltonian (symplectic) structure.
Further, we will apply these ideas to initial value problems with quasi-periodic boundary conditions.

2008-11-05

Eleuterio Toro. University of Trento, Italy
Centred numerical schemes for hyperbolic equations in conservation form.
Auditorio Ninoslav Bralic -15:00 Hrs
Abstract:

http://www.newton.ac.uk/preprints2009.html 

"

2008-10-13

Francisco-Javier Sayas. Universidad de Minnesota
Numerical Integral Scattering (Dispersión Numérica de Ondas Por Integrales)
Sala 2 (Vìctor Ochsenius) - Facultad de Matemáticas - 16:30 Hrs.

2008-09-24

Yaël Frégier. Institut de Mathématiques, Université Du
Algebraic structures derived from minimal models
Sala 2 (Vìctor Ochsenius) - Facultad de Matemáticas - 16:30 Hrs.
Abstract: