## A variant of the Reifenberg parameterization algorithm

#### Guy DavidUniversité Paris-Sud 11Mathematiques

The plan is to describe the proof of Reifenberg's topological
disk theorem, hoping that it will be new to a good part of the audience.
I'll also say why minor variants of the algorithm could lead to slightly
different results, and for instance give pieces of bilipschitz images of $R^d$
in $E$ when $E$ is Ahlfors-regular and Reifenberg-flat. This is joint work
with T. Toro. We did not check everything yet, so if something fails,