This is what I didn’t get about open and closed sets.

Hitler learns topology and explains one of the things that always confused me when I learned about open and closed sets. I’m with Hitler on this one. Open and closed sets? Neither open nor closed? It’s enough to make your head hurt if you think about it too hard. Too bad Downfall parodies weren’t a big thing when I was taking real analysis, or my professor would have heard references to this video every day (in a joking way, of course).

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