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 Post subject: formal proof
PostPosted: Sat, 29 May 2010 02:00:03 UTC 
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Can someone give a formal proof of the following:


\forall x\forall y\forall z[ (x+y+z)^2\geq 0]


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PostPosted: Sat, 29 May 2010 02:36:54 UTC 
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x+y+z\in\mathbb{R}

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