lunchtime seminar // 10 January 2023

Ergodic theory meets partial differential equations: The Halmos-von Neumann theorem and the shape of a drumWe discuss that a connection between these two, apparently rather different, topics can be found by using the language of positive operators: both the conclusion of the Halmos-von Neumann theorem and the desired conclusion of the "shape of a drum" problem can be rephrased as the existence of a positivity preserving linear operator that intertwines certain dynamical systems The question thus arises whether insights from the proof of the Halmos-von Neumann theorem can be useful to gain a better understanding of the "shape of a drum" problem.

Organized by Tanja Eisner, Bálint Farkas, Markus Haase, Henrik Kreidler, Rainer Nagel

The talks take place on Tuesdays at 12:30 CET simultaneously in

The talks take place on Tuesdays at 12:30 CET simultaneously in

- Kiel: Raum EG.029, Math. Seminar, Heinrich-Hecht-Platz 6
- Wuppertal: G15.25, Gaußstraße 20
- Tübingen: Raum C6P05, Auf der Morgenstelle 10
- zoom: please register to get the link