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Jul 28, 2020 at 7:30 vote accept Dominic van der Zypen
Jul 27, 2020 at 13:10 answer added bof timeline score: 3
Jul 27, 2020 at 11:42 comment added Anonymous If $X_1$ and $X_2$ are non-homeomorphic countably infinite spaces each having exactly one non-isolated point, then they have the same dense subsets.
Jul 27, 2020 at 9:02 history asked Dominic van der Zypen CC BY-SA 4.0