If α,β,γ are vectors in the Euclid space V, please show that(adsbygoogle = window.adsbygoogle || []).push({});

|α-β||γ|≤|α-γ||β|+|β-γ||α|,where |α|=√(α,α)

and point out when the equal mark holds.

Can someone help me out?

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# An inequality about inner product

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