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MathGroup Archive 2006

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RE: Demostration

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70394] RE: [mg70369] Demostration
  • From: "Erickson Paul-CPTP18" <Paul.Erickson at Motorola.com>
  • Date: Sun, 15 Oct 2006 00:19:16 -0400 (EDT)

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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