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  • *<math>X</math> is [[Countability|second-countable]], i.e. it has a [[countable]] [[base (topology) | base]].
    2 KB (237 words) - 20:08, 13 October 2019
  • == Countability axioms == The Sorgenfrey plane is [[countability axioms|first-countable]], is separable (has a countably dense subset, namel
    1 KB (205 words) - 10:20, 26 May 2019