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.

Priv.-Doz. Dr. Andreas Nickel

Universität Duisburg-Essen
Fakultät für Mathematik
Thea-Leymann-Str. 9
45127 Essen

Office: WSC-O-3.70

Phone: +49 / (0)201 / 18-32386
Email: andreas.nickel - at -