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?