Proof Inequalities: Find the Solution

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phillyolly

Homework Statement

The problem and my half solution is given. How do I proceed with the proof?

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╔(σ_σ)╝

Try using the triangle inequality. Your proof is flawed.

Or use a proof by contradiction.

Last edited: Sep 5, 2010

╔(σ_σ)╝

It is easy to find out when equality holds for the triangle inequality. This is key to your problem.