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Jun 14, 2015 at 5:32 comment added Cicero Upon reflection, you use an argument eerily identical to one contained in the Principia Mathematica by Isaac Newton to prove Kepler's second law @Floris.
May 19, 2015 at 23:21 comment added Cicero Insightful answer. Nice pictures!
May 19, 2015 at 4:42 history answered Floris CC BY-SA 3.0