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Apr 13, 2017 at 12:58 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Mar 21, 2017 at 16:51 vote accept Ramiro de la Vega
Mar 20, 2017 at 0:39 answer added Anonymous timeline score: 3
Feb 27, 2013 at 21:33 history edited Ramiro de la Vega CC BY-SA 3.0
Update after answer and comments
Feb 26, 2013 at 18:52 answer added Santi Spadaro timeline score: 6
Feb 26, 2013 at 17:43 comment added Gerald Edgar Note: $X$ is countably generated (= has countable tightness) if and only if the closure of any subset $A$ of $X$ equals the union of closures of all countable subsets of $A$. (from Wikipedia)
Feb 26, 2013 at 16:09 history asked Ramiro de la Vega CC BY-SA 3.0