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when toggle format what by license comment
Feb 18, 2011 at 2:00 comment added Joseph O'Rourke See also my note of June 3rd on this same problem. It deserves double mention!
Jul 2, 2010 at 9:55 comment added Swapnil Bhatia Nice. I like the 1-PFA problem for the same reason.
Jul 2, 2010 at 2:36 history answered Timothy Chow CC BY-SA 2.5