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Apr 12, 2011 at 8:27 vote accept alext87
May 22, 2010 at 1:52 comment added fedja In the Hilbert space setting the easiest way to see the whole thing is to fo on the Fourier side and see what you can get from Cauchy-Schwartz (just localize first by multiplying by a smooth cutoff). The second part of Claim 3 is wrong by the way...
May 21, 2010 at 14:56 history answered Pietro Majer CC BY-SA 2.5