Date: Mar 2, 2013 4:45 PM
Author: Deep Deb
Subject: Re: ---- --- --- --- validity of an equation
On Saturday, March 2, 2013 3:08:24 PM UTC-5, quasi wrote:

> You removed the relevant context, so I'll remove still

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> more.

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> In the reply you snipped, I showed:

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> If x,y,z are integers such that

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> y^(1/2) = (x^10 - z^5)^(1/5)

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> then, letting w = x^10 - z^5, the equation reduces to

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> y^5 = w^2

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> which implies y is a perfect square and w is a perfect 5'th

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> power.

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> Now you ask, what if we assume that y is not a perfect square?

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> Then you get a contradiction, of course.

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> A triviality.

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> quasi

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Thanks quasi, you are right

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