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when toggle format what by license comment
Apr 13, 2017 at 12:58 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Jan 18, 2011 at 3:38 history edited Igor Rivin CC BY-SA 2.5
better, explicit construction
Jan 17, 2011 at 19:04 history answered Igor Rivin CC BY-SA 2.5