### 28 January – Jürgen Richter-Gebert: Regular 4-Polytopes, Quaternions, and Hopf Fibrations

Platonic solids are very special objects that exhibit an extremely high degree of symmetry. Regular polytopes are their generalization to higher dimensions and admit – no surprise – even higher degrees of symmetry.
Jürgen Richter Gebert is full professor for Geometry and Visualization at the Technical University of Munich.