Hitler Learns Topology

Hitler gets confused about the topological definitions of open and closed sets. Then he totally freaks out. There’s a typo right in the beginning of the video. It should say “...and all zero of the points in the null set,“ so no “the“ before zero. And if you’re wondering what I meant by “close points,“ they are Wikipedia calls “limit points“ of a set, points whose neighborhoods always intersect with the set.