Past Events

Which 3-manifolds smoothly embed in the 4-sphere? This seemingly simple question turns out to be rather subtle. Using Donaldson's theorem, we derive strong restrictions to embedding a Seifert fibered space over an orientable base surface, which in...

Inspired by a problem in joint source-channel coding, we introduce a new notion of similarity between graphs, termed graph information ratio. We discuss various properties of this measure, including in particular metric structure and partial ordering...

A double occurrence word w is a word (sequence of letters) in which each of its letters occurs exactly twice. Legal 2-coloring of w is a colouring of individual letters such that each letter occurs once red and once blue. Our goal is to find for a...

In 1971, Ruzsa conjectured that if f: N→Z with f(n+k)≡f(n) mod k for every n,k∈N and f(n)=O(θn) with θ

Northwest Probability Seminars are mini-conferences held at the University of Washington and organized in collaboration with the Oregon State University, the University of British Columbia and the University of Oregon. There is no registration fee...

The "doubling property" refers to the property (of a metric measure space) that max{Vol(B(x,2r))/Vol(B(x,r)): r>0} is bounded. We consider the following question: do we have good control of the doubling property for left-invariant geometries on a...

The regularity problem for the Navier-Stokes equation is one of the biggest open problems in nonlinear PDE. In this talk, I will use the evolution equations for the strain and vorticity to derive an identity for enstrophy growth that depends only on...

We describe detailed two-sided inequalities for the three-player ruin problem and related estimates for killed random walks in inner-uniform finite subset of grids and other graphs. The key is the simultaneous use of the appropriate Doob transform...

Conway mutation is an operation on links that is notoriously difficult to detect: it preserves many link invariants such as the signature, the Alexander polynomial or, more generally, the HOMFLY polynomial. Baldwin and Levine conjectured that δ...

The Hedtrich lab is developing human-based organ models with a current focus on skin and lung. They are specifically interested in the modeling of inflammatory and genetic diseases in vitro and use the organ models to study (patho)physiological...