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when toggle format what by license comment
Dec 12, 2017 at 23:49 comment added ProfRob @Ben physics.stackexchange.com/questions/225522/…
Dec 12, 2017 at 23:49 history edited ProfRob CC BY-SA 3.0
added 98 characters in body
Dec 12, 2017 at 21:27 comment added Ben How would such a simple proof look like? It doesn't seem obvious to me.. :(
Mar 24, 2015 at 23:03 history answered ProfRob CC BY-SA 3.0