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Jun 27, 2012 at 3:42 comment added Mika Thanks for the reference. But, so far, I didn't find an answer to my question in it. It seems that the paper is more about eigenvalues. I don't see how to apply it to the l^2 setting.
Jun 26, 2012 at 15:09 history answered Igor Rivin CC BY-SA 3.0