## Scientific Lectures

- 6-Mar-08

The abelian/nonabelian correspondence in Gromov-Witten theory I

Given a "good" action of a reductive complex algebraic group G on a projective manifold X, the abelian/nonabelian correspondence refers to a precise relation that exists between topological invariants (cohomology, K-theory) of the Geomet more››

University of British Columbia

- 6-Mar-08

Microtubules are dynamic polymers found in all eukaryotic organisms that build the cellular machines that separate chromosomes, polarize the cytoplasm, direct expansion and divide cells. Interestingly, plant cells lack the central microtubule-orga more››

University of British Columbia

- 5-Mar-08

An update on spaces of embeddings

The Cerf-Morlet comparison theorem states that the group of diffeomorphisms of the compact n-ball which is the identity on the boundary is an (n+1)-fold loop space, whose (n+1)-fold de-looping is the homotopy-quotient of the group of the PL-homeom more››

University of British Columbia

- 4-Mar-08

Asymptotic stability of lattice solitons in the energy space

TBA more››

University of British Columbia

- 3-Mar-08

Asymptotic stability of lattice solitons in the energy space more››

University of British Columbia

- 3-Mar-08

A Compactification of the space of Maps from Curves

We will present a new compactification of the moduli space of maps from pointed nonsingular complex projective stable curves to a nonsingular complex projective variety with prescribed ramification indices at the points. It will be explained that more››

University of British Columbia

- 1-Mar-08

Optimal Strong Stability Preserving Time Discretizations more››

Simon Fraser University

- 29-Feb-08

Optimal Strong Stability Preserving Time Discretizations

Traditional stability concepts for ODE solvers typically deal with linear equations and/or bounds involving inner-product norms only. Modern problems of interest are typically nonlinear and in many casesthe relevant bounds for the problem inv more››

University of British Columbia

- 28-Feb-08

Primitive roots and the Euclidean algorithm

An integer s is called a primitive root modulo a prime p if the multiplicative set generated by s surjects onto all non-zero residue classes modulo p. Artin's primitive root conjecture states that all integers s other than -1 or squares are primitive more››

University of British Columbia

- 28-Feb-08

Eigenvalues of random matrices and not the Riemann Hypothesis

Random matrix theory has been a hot topic in number theory, particularly since the Rudnick and Sarnak landmark work on the spacing of consecutive zeros of L-functions. This highly accessible talk has a far more elementary flavour, focusing on eigenva more››

University of British Columbia

- 28-Feb-08

- 26-Feb-08

Regularity of optimal transportation maps more››

University of British Columbia

- 25-Feb-08

Theories of the General Ocean Circulation

University of British Columbia

- 22-Feb-08

Moving Unstructured Mesh Methods

Simulation of moving physical interfaces in 3-D is complicated by the need to (1) resolve complex realistic geometries with a spatial discretization, (2) accurately compute evolving physical fields on the discretization, and (3) evolve the di more››

Simon Fraser University

- 22-Feb-08

- 21-Feb-08

Modelling the Endothelial Cell Response to Fluid Flow

Following the onset of shear stress due to fluid flow endothelial cells polarise and elongate in the direction of flow. How the mechanical signal is transformed into an organised and directed response is poorly understood. A multi-scale cellular P more››

University of British Columbia

- 7-Feb-08

An extension to the Brun-Titchmarsh theorem

The Siegel-Walfisz theorem states that for any B>0, we have Sp=x, p?d (mod v) 1 ~ x/f(v) log(x) for v = logB(x) and (v,d)=1. This only gives an asymptotic formula for the number of primes in an arithmetic progression for quite a small modulus v co more››

Simon Fraser University

- 7-Feb-08

Manin conjectures for K3 surfaces

The Manin conjectures describe for geometrically easy varieties how the number of their rational points of bounded height should grow as the height bound varies. In this talk I will describe recent computations that suggest a similar statement for more››

Simon Fraser University

- 7-Feb-08

Newton Polyhedra and Sharp Estimates for Oscillatory Integrals more››

University of British Columbia

- 31-Jan-08

When optimization becomes irrelevant: time-inconsistency and its consequences

In optimal control, one traditionally discounts the future at a constant rate: a gain u occurring at time t>0 is valued today at u exp(-rt), where r is the discount rate. If non-constant discount rates are used, as they should more››

University of Victoria