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when toggle format what by license comment
May 7, 2014 at 16:11 vote accept user50224
May 7, 2014 at 9:27 comment added Davidmh Knowing Feynman, he probably did it adjusting the signs. One of my professors used to say "Never start a calculation before knowing what the answer is going to be".
May 7, 2014 at 6:32 history answered David Z CC BY-SA 3.0