# Persi Diaconis: Who Needs Positivity?

Persi Diaconis: Stanford University

**Time: **Fri 2012-02-10 13.30 - 16.30

**Location:** Oskar Kleins auditorium, AlbaNova

Classical theorems of probability such as the central limit theorem or the Perron-Frobenius theorem seem to lean on positivity. It is natural to ask what happens without positivity. It turns out that there is a perfectly nice limit theory (some restrictions apply, as they say in the advertisements). This was started by Schoenberg and continued by Thomee and others. It has applications to data smoothing and numerical schemes for running PDE's. This is joint work with Laurent Saloff-Coste.

## Schedule

13.30-14.15 Precolloquium: for PhD and master students

14.30-15.30 Colloquium talk by Persi Diaconis

15.30-16.30 Coffee and SMC social get-together