I'm stuck on one aspect of the proof on page 105 of the 2nd edition. Equation 6.13 is necessary for the inequality to be an equality as it says but they never seem to account for inequality 6.11. Specifically, I don't see how this satisfies 2 Re<u,v> = 2 |<u,v>|(adsbygoogle = window.adsbygoogle || []).push({});

Thanks for any guidance.

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# Triangle Inequality in 'Linear Algebra Done Right'

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