Unless otherwise stated, the colloquium lectures will be held on Tuesdays at 4 p.m. (s.t.) in the Rotunde of the Cartesium in Enrique-Schmidt-Str. 5. Coffee/tea and pastries will be available from 3.30 p.m. The inviting persons will be the contact persons for the guests and the lectures. General partners are Professor Christine Knipping and Professor Jens Rademacher.