Past Events

Define $e_{n}(t)=\{t/n\}$. Let $d_N$ denote the distance in $L^2(0,\infty ; t^{-2}dt)$ between the indicator function of $[1,\infty[$ and the vector space generated by $e_1, \dots, e_N$. A theorem of B\'aez-Duarte (2003) states that the Riemann...

In this hastily prepared talk, I will describe some preliminary results of Nathan Ng and myself that concern linear dependencies (with integer coefficients) among zeros of Dirichlet L-functions. We can show, for example, that given a Dirichlet L...

Wood is nature’s solution to the structural and hydraulic problems faced by the World’s largest living organisms-trees. The solutions to these problems are both elegant and energy efficient and are starting to inspire new (biomimetic) approaches to...

Let \gamma be a smooth closed curve of length 2\pi in R^3, and let \kappa(s) be its curvature regarded as a function of arc length s. We associate with this curve the one-dimensional Schroedinger operator H_\gamma = -d^2/ds^2 + \kappa^2(s) acting on...

Let F be a kxl (0,1)-matrix. We say that a (0,1)-matrix A has F as a `configuration' if some row and column permutation of F is a submatrix of A. We are interested in `simple' matrices, namely (0,1)-matrices with no repeated columns. If A is a simple...

Mesh subdivisions are used frequently to build objects and characters for computer animation, computer games, and industrial computer-aided geometric design. The design process starts with a coarse-mesh model of an object, and the mesh is refined and...

We give an example of two finitely generated quasi-isometric groups that are not bilipschitz equivalent. The proof involves structure of quasi-isometries from rigidity theorems, analysis of bilipschitz maps of the n-adics and uniformly finite...

In this talk we discuss some new trends and developments in variational analysis and its numerous applications in both finite-dimensional and infinite-dimensional spaces, emphasizing those to optimization and equilibrium problems, robust stability...

The simplicial complex of talk I consists of pieces of the classifying spaces of symmetric groups. We use this to investigate the homology of moduli spaces. At the end, we discuss generalizations, where the symmetric groups are replaced by other...