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RE: Demostration


I guess this doesn't 'prove', but perhaps demonstrates:


Select[ Range[-100000,200000], IntegerQ[Sqrt[#^3+9]] &]

{-2,0,3,6,40}

There are 5 x values within a reasonable range. The ten (fine pairs) are
+/- due to the Sqrt for y.


You might choice a smaller range in order for faster execution ;-)




-----Original Message-----
From: Miguel [mailto:mibelair at hotmail.com]
To: mathgroup at smc.vnet.net
Subject: [mg70394] [mg70369] Demostration

How canI to demostrate than the equation y^2=x^3+9 has 10 integer
solutions?



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