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when toggle format what by license comment
Apr 13, 2017 at 12:57 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Jul 25, 2011 at 19:55 history edited Qing Liu CC BY-SA 3.0
Add the intersection number in the general situation.
Jul 24, 2011 at 19:33 history answered Qing Liu CC BY-SA 3.0