Past Events
Scientific, Seminar
Algebraic Geometry Seminar: Self rational maps of K3 surfaces
December 7, 2009
University of British Columbia
It is expected that a general K3 surface does not admit self rational maps of degree > 1. I'll give a proof of this conjecture for K3 surfaces of genus at least 4.
Scientific, Seminar
Mathematical Biology Seminar: A 3D computational model of the Mammalian Cochlea with Asymptotics
December 3, 2009
University of British Columbia
We seek to build a computational model for the simplified Mammalian Cochlea with the standard coupled fluid-plate equations as our base. Physiological data shows a clear wave nature in the response of the basilar membrane to stimulus. We seek to...
Scientific, Seminar
Probability Seminar: Deterministic Poisson thinning on finite and infinite volumes
December 2, 2009
University of British Columbia
Given a homogeneous Poisson point process it is well known that selecting each point independently with some fixed probability gives a homogeneous Poisson process of lower intensity. This is often referred to as thinning. Can thinning be achieved...
Scientific, Seminar
A Hybrid Approach For Solving Sparse Linear Least Squares Problems
December 2, 2009
University of British Columbia
We propose a hybrid method for solving large sparse linear least squares problems. The method is iterative in nature, as it is based on preconditioned LSQR. However, the preconditioner comes from an orthogonal factorization of a submatrix of the...
Scientific, Seminar
Small solutions of Nonlinear Schrodinger Equations with Many Bound States
December 2, 2009
University of British Columbia
Consider a nonlinear Schr\"{o}dinger equation in $\mathbb{R}^3$ with a short-range potential. The linear Hamiltonian is assumed to have three or more eigenvalues satisfying some resonance conditions. We study the asymptotic behavior at time infinity...
Scientific, Seminar
Perfect matchings in grid graphs after vertex deletions
December 2, 2009
University of British Columbia
We investigate the d-dimensional grid graph [m]x[m]x...x[m] for even m. The graph is bipartite. If we choose a subset B' of the black vertices and a subset W' of the white vertices then the graph obtained by deleting B' and W' has a perfect matching...
Scientific, Seminar
Moduli spaces of curves with A_k-singularities
December 1, 2009
University of British Columbia
I will present work-in-progress on the construction of compactifications of the moduli space of curves with A_k-singularities. These spaces conjecturally give moduli interpretations of certain log canonical models of the moduli space of curves. This...
Scientific, Seminar
Vancouver Econometrics Workshop: Patrik Guggenberger & Shinichi Sakata
November 27, 2009
Simon Fraser University
Scientific, Seminar
Number Theory Seminar: Ranks of elliptic curves over function fields
November 27, 2009
University of British Columbia
This talk is based on a series of five lectures given by Doug Ulmer at the Park City Mathematics Institute in 2009. I will present Ulmer's proof that elliptic curves over function fields can have arbitrarily high Mordell-Weil rank.
Scientific, Seminar
PIMS/WMAX Postdoctoral Colloquium: Some issues relating to fluid-structure interaction problems
November 26, 2009
University of British Columbia
In this talk, through basic examples, I will try to illustrate how various classical problems of analysis arise when modeling the interactive motion of a fluid and a rigid structure: well-posedness, stability, asymptotic analysis, control and inverse...