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May 6, 2010 at 22:36 comment added Wadim Zudilin Fedja, you didn't give me a chance to write down the proof I had developed in my dreams! :) It's exactly the same one (but I did the reduction to $(4*a*c-b^2)*X^2+Y^2$ explicitly), and exactly the same question (is it possible to get a universal $C$) arises... +1.
May 6, 2010 at 19:21 history edited fedja CC BY-SA 2.5
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May 6, 2010 at 17:57 history answered fedja CC BY-SA 2.5