## Scientific Lectures

- 16-May-07

Oscillating random walk on Z driven by its occupation time at zero

I will consider a nearest-neighbor random walk X_n on integers with the drift at time n (conditional on the past expectation of $X_{n+1}-X_n$) equals to $-sign(X_n)f^{-1}(eta_n),$ where eta_n is the number of visits to zero by time n and f(n) is a more››

University of British Columbia

- 15-May-07

Differences of semigroups, eigenvalue bounds, and their application to Schroedinger operators

TBA more››

University of British Columbia

- 11-May-07

Non-reductive group actions and symplectic implosion

Given a linear action of a complex reductive group on a projective variety X, geometric invariant theory provides us with an open subset of X (the set of stable points) which has a well-behaved quotient, and a compactification of this quotie more››

University of Washington

- 9-May-07

Boundary Value Problems for Elliptic PDEs and the Morse Index

A symplectic view of linearized elliptic problems leads naturally to the formulation of an appropriate Maslov Index. This is well-known in one space dimension and is generalized here to domains in higher space dimensions. The result is a Morse Ind more››

University of British Columbia

- 9-May-07

Gamma-Convergence and Saddle Points

We prove a theorem asserting, roughly speaking, that if a sequence of functionals converges to a limiting functional (in the sense of Gamma-convergence, a natural and widely-used notion in the calculus of variations), and if the limiting functiona more››

University of British Columbia

- 8-May-07

Going with Flow and Updating Ocean Models

Much data in the ocean come from Lagrangian instruments that float or drift. Mathematical issues arise from the need to assimilate these and other data into ocean models. more››

University of Washington

- 7-May-07

We analyze portfolio credit risk in light of dynamic "frailty," in the form of incompletely observed covariates. Common dependence by firms on unobservable time-varying default covariates is estimated to cause large changes in conditiona more››

University of British Columbia

- 4-May-07

In these two lectures I will survey my recent work with Lupercio and Xicotencatl on the properties of the homology of the free loop space of an orbifold. In the first lecture I will review the work of Chas and Sullivan on string topology and I wil more››

University of British Columbia

- 2-May-07

Spanning Trees, Random Graphs, and Random Walks

In the usual Erdõs-Rényi model of random graphs, each pair of n vertices is connected by an edge independently with probability c/n for some constant c. When c > 1, it has a unique 'giant' component. How quickly does the number of spannin more››

University of British Columbia

- 2-May-07

In these two lectures I will survey my recent work with Lupercio and Xicotencatl on the properties of the homology of the free loop space of an orbifold. In the first lecture I will review the work of Chas and Sullivan on string topology and I wil more››

University of British Columbia

- 30-Apr-07

Modular tensor categories from semisimple algebras

Modular tensor categories are finitely semisimple Abelian categories with some additional structure that allows us to obtain combinatorial invariants of oriented framed tangles. Reshetikhin and Turaev invented them in order to construct their 3-ma more››

University of British Columbia

- 30-Apr-07

Chow group of 0-cycles on a surface over a p-adic field with infinite torsion subgroup

In this talk I would like to demonstrate how Hodge theory can play a crucial role in an arithmetic question. The issue is to construct an example of a projective smooth surface X over a p-adic field K such that for any prime more››

University of Alberta

- 30-Apr-07
- 1-May-07

Infinite profinite groups encapture asymptotic properties of arrays of finite groups. We will discuss the important examples of (large) profinite groups and their relations to number theory, geometry and theoretical computer science. more››

Simon Fraser University

- 27-Apr-07

Symposium on Kinetic Equations and Methods

A conference in honour of the 10th anniversary of the founding of the Pacific Institute for the Mathematical Sciences. World leaders from diverse branches of kinetic theory will gather for an intense two-day worksh more››

University of Victoria

- 26-Apr-07

Adaptive evolution and concentrations in parabolic PDEs

Living systems are subject to constant evolution. Their environment can be considered as a nutrient shared by all the population. This allows certain individuals, characterized by a ‘physiological trait’, to expand faster because they are bett more››

University of Alberta

- 26-Apr-07

A Nonlinear PDE Model for Lakes and Rivers

Simon Fraser University

- 25-Apr-07

Prandtl Conjecture and von Neumann Paradox for Shock Reflections

We plan to discuss the two fundamental problems, the Prandtl Conjecture and von Neumann Paradox, in the theory of supersonic flows with shock waves. These problems were raised in the first half of the 20th century and clearly formulated in the cla more››

University of British Columbia

- 24-Apr-07

The sharp isoperimetric inequality on minimal submanifolds

We will describe the history of the conjecture that the isoperimetric inequality with the Rn constant should hold for a domain on a minimal submanifold of dimension n in Euclidean space. We will then describe a new method which pr more››

University of Washington

- 24-Apr-07

Mathematical analysis of models for chemotaxis: parabolic, hyperbolic, kinetic

TBA more››

University of British Columbia

- 24-Apr-07

Mihalis Yannakakis is the Percy K. and Vida L. W. Hudson Professor of Computer Science at Columbia University. Prior to joining Columbia, he was Director of the Computing Principles Research Department at Bell Labs (1991-2001) and at Avaya Labs (2 more››

Simon Fraser University