The colloquium takes place on Tuesdays 17:15 to 18:30 in Lecture Room B302 (main building; Welfenschloss). Before the lecture there is the opportunity for informal discussion outside the lecture room from 16:45

Questions should be addressed to the organisers Prof. Dr. Ulrich Derenthal (derenthal@math.uni-hannover.de) and Prof. Dr. Wolfgang Ertmer (ertmer@iqo.uni-hannover.de).

**Programme**

**23.04.19 Roger Heath-Brown (University of Oxford)**

Counting Rational Points on Lines and Conics

** 21.05.19 Carsten Fallnich (University of Münster)**

Neue Wege in der Raman-Mikroskopie (New Avenues in Raman Microscopy)

** 18.06.19 Sergei Tabachnikov (Pennsylvania State University)**

Flavors of bicycle mathematics

** 02.07.19 Stefan Schmeja and Esther Tobschall (TIB)**

arXiv and beyond: Open Access in Mathematics and Physics