On the occasion of Prof. Hermann Hähl's 80th birthday, a colloquium was held at the Department of Mathematics on 14.04.2025. The colloquium lecture by Prof. Linus Kramer (University of Münster) was dedicated to “Manifolds that look like projective planes”. Many former students and doctoral candidates from Prof. Hähl's more than 40 years of teaching also accepted the invitation to the colloquium, as well as colleagues from universities from Kiel to Furtwangen.
Prof. Hähl received his doctorate in mathematics from the University of Tübingen in 1974 and was awarded a Heisenberg Fellowship in 1997. During his studies in Paris in 1970/1971, he worked together with the topologist Laurent Siebenmann (Université Paris-Sud). Prof. Hähl accepted an appointment at the University of Kiel in 1981 before moving to the University of Stuttgart in 1996 to take up the Chair of Geometry in the Department of Mathematics. His first lecture here was “Higher Mathematics for Engineers”, at that time with Markus Stroppel as his assistant. Prof. Hähl retired in 2010, but still maintains close contact with the Institute of Geometry and Topology.
