### Slides for Freed’s Andrejewski Lecture

#### Posted by Urs Schreiber

As Bruce Bartlett kindly pointed out to me, the slides of (the first part of) Dan Freed’s Anrejewski Lecture in Leipzig last spring are available on his website:

Dan Freed

Twisted K-Theory and the Verlinde Ring

On these introductory slides, Freed recalls the Freed-Hopkins-Teleman theorem, mentions how *fusion* of loop group representations can be understood from the fusion of strings, how quantum field theory is about representations of cobordism categories and how quantum evolution by means of the path integral can be understood from pull-push through correspondences of configuration spaces.