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Mar 31, 2013 at 10:35 comment added Etienne Thanks for this nice proof, which is quite different from (and perhaps shorter than) the one I knew. I still cannot believe that the result has never been stated (and proved) in some book and/or paper, but a google search led to nothing.
Mar 31, 2013 at 10:12 history answered Sergei Ivanov CC BY-SA 3.0