This is one of those situations where the video is just an insane value-add above and beyond the Wikipedia article that this sort of response is baffling to me. The well thought out presentation and progression of the concepts. Just enough context to keep the non math grad students following along without wasting time or talking down to the audience.The incredible visualizations that are both beautiful and insightful. Someone spent months of their life making this video as good as it could be, and it shows.