The sum (self-made)

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*Mahi*
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Re: The sum (self-made)

Unread post by *Mahi* » Thu Mar 01, 2012 12:33 pm

It is quite easy then, and doesn't need any cases.
Prove , $\sqrt a + \sqrt b \in \mathbb Q \Rightarrow \sqrt a - \sqrt b \in \mathbb Q $
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