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May 11, 2014 at 16:16 vote accept domenico fiorenza
May 11, 2014 at 16:16 comment added domenico fiorenza Thanks! Now that I see it, I see I had proved this a couple of months ago and then I had completely forgotten the reasoning (the Kubla Khan effect :) ). Thanks a lot!
May 11, 2014 at 15:15 history answered Sasha CC BY-SA 3.0