How to Prove a Set Forms a Topology

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Could you do a couple of transition videos from video #3 to this one? This is so much more challenging.

brendanmccann
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f inverse Y = tau 1 (we state that at time 1:40) but that would be true only if function f is ONTO. Am I missing something ... sorry

HariAnantharaman
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Can you do some proofs with regular and Hausdorff spaces

larrymintz
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нихуя не понятно, но оооочень интересно!

TheCitrusss