Intro https://www.mathematics.uni-bonn.de/hcm/pictures/3a3aa4cdd232 https://www.mathematics.uni-bonn.de/hcm/++resource++plone-logo.svg Intro External Video-URL https://www.youtube.com/watch?v=i3hsXtQdNUM&list=PPSV&ab_channel=HausdorffCenterforMathematics Preview-Image Search Engine Exclude no
