## PIMS/UBC Distinguished Colloquium: Marianna Csörnyei (U.Chicago)

- Date: 10/26/2012

Marianna Csörnyei, *U.Chicago*

Marianna Csörnyei works in real analysis, geometric measure theory, and geometric nonlinear functional analysis. She proved the equivalence of the zero measure notions of infinite dimensional Banach spaces. In 2008 Csörnyei was awarded the Philip Leverhulme Prize for Mathematics and Statistics.

University of British Columbia

Differentiability of Lipschitz functions and tangents of sets.

We will show how elementary product decompositions of measures can detect directionality in sets, and show how this can be used to describe non-differentiability sets of Lipschitz functions on R^n, and to understand the phenomena that occur because of behaviour of Lipschitz functions around the points of null sets.

In order to prove this we will need to prove results about the geometry of sets of small Lebesgue measure: we show that sets of small measure are always contained in a "small" collection of Lipschitz surfaces.

The talk is based on a joint work with G. Alberti, P. Jones and D. Preiss.

Lecture begins at 3:00 pm in MATX 1100, preceded by a reception in MATH 125 at 2:30 pm