Thirty high-school students of the Fanny-Leicht-Gymnasium were invited to a special lecture in Mathematics at the Univeristy of Stuttgart on June 3, 2019. Prof. Michael Eisermann and Dr. Friederike Stoll talked about "Der Satz vom Diktator". This event was part of the lecture series "TryScience" and showed the work in courses and excercises at university. In additioon Dr. Stoll explained the studyprogram of the Department of Mathematics.