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4 events
when toggle format what by license comment
Sep 26, 2011 at 2:48 history edited Noam D. Elkies CC BY-SA 3.0
Typo correction aboce --> above
Sep 14, 2011 at 5:15 history edited Noam D. Elkies CC BY-SA 3.0
Add geometrical picture
Sep 14, 2011 at 4:36 vote accept David
Sep 14, 2011 at 4:35 history answered Noam D. Elkies CC BY-SA 3.0