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Jun 2, 2010 at 0:29 comment added Wadim Zudilin @fherzig: Thanks for pointing out this mistake. +1. I was trying to find this trick "polynomial-quadratic form" at some place but couldn't. Passing to bilinear forms is much more than fix! It's now 100% Darji's proof.
Jun 1, 2010 at 17:23 comment added darij grinberg You are right. We must go for bilinear rather than quadratic forms. I'll fix my post according to this.
Jun 1, 2010 at 17:15 history edited fherzig CC BY-SA 2.5
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Jun 1, 2010 at 17:08 history edited fherzig CC BY-SA 2.5
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Jun 1, 2010 at 16:38 history answered fherzig CC BY-SA 2.5