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Timeline for Diophantine equation problem

Current License: CC BY-SA 2.5

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May 31, 2010 at 3:04 comment added Will Jagy Hello, Cindy. I have put a ton of related material at: zakuski.math.utsa.edu/~kap/forms.html On Wadim's idea, there should not be a really easy way to produce integral representations with arbitrary $M$ on the right-hand-side, see my answer (and the others) to mathoverflow.net/questions/3596
May 31, 2010 at 1:17 vote accept MathematicianMummy
May 31, 2010 at 1:17
May 30, 2010 at 23:43 comment added Wadim Zudilin Will, in spite of rain outside I have to teach, so no way to get a longer sleep. On my bus way to uni I wrote a general solution of the equation in rational (by intersecting the ellipsoid with the line $x=t(z-1)$, $y=s(z-1)$ for a rational pair of slopes $t,s$) to see that it does not give a simpler way to produce integer solutions.
May 30, 2010 at 22:11 comment added Will Jagy Hi Wadim, it does give the appearance of homework as stated for the value $1$ on the right hand side. This would be a stretch for a school-child first exposed to "completing the square." I chose to ignore the $1$ and give the merest hint of what happens next. Meanwhile, I think you should go back to bed. Victor Wadimovich depends on you and you need your strength.
May 30, 2010 at 21:44 comment added Wadim Zudilin Will, I am getting up too early. The quadratics correspond to the Cartan matrix which reminds me about Rogers-Ramanujan identities. Apart from this, the OP sounds like homework. :)
May 30, 2010 at 19:18 history answered Will Jagy CC BY-SA 2.5