Because of the attack on the computer network of the University of Duisburg-Essen, some content (in particular some image files) cannot be accessed because it is stored on central servers of the university.

Prof. Dr. Ursula Ludwig

Universität Duisburg-Essen
Fakultät für Mathematik
45117 Essen

Office: WSC-O-4.62

Email: ursula.ludwig - at -

Personal web site