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Jun 24, 2018 at 6:17 comment added Fedor Petrov This is just an unusually hard proof of the partial case of the obvious claim that having a countable base is hereditary property.
Jun 23, 2018 at 21:51 vote accept user125920
Jun 24, 2018 at 10:55
Jun 23, 2018 at 21:49 history answered Fedor Petrov CC BY-SA 4.0