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Non-homeomorphic spaces that have continuous bijections between them

aug 9 10 at 18:04 ethan akin 11●1

 
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Relatively countably compact subsets without countably compact closure.

jul 8 10 at 9:41 KP Hart 2,281●3●11

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Collatz conjecture solved? [closed]

jun 2 11 at 18:03 Henno Brandsma 2,216●6●18