https://mathoverflow.net/questions/19152/why-is-a-topology-made-up-of-open-setsWhy is a topology made up of 'open' sets?I'm ashamed to admit it, but I don't think I've ever been able to genuinely motivate the definition of a topological space in an undergraduate course. Clearly, the definition distills the essence o...mathoverflow.net이거 김민형교수님이 쓰신거였네 ㅋㅋㅋ 오늘 어쩌다 다시보고 알았는데 신기함 - dc official App
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