Verfication of deduction made using the Cauchy-Schwartz inequality – math.stackexchange.com

Verfication of deduction made using the Cauchy-Schwartz inequality – math.stackexchange.com

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Is the following proof correct? Show that $$16\leq(a+b+c+d)\left(\frac{1}{a}+\frac{1}{b}+\frac{1}{c}+\frac{1}{d}\right)$$ for all positive numbers $a,b,c,d$. Proof. Let $\mathbf{R}^4$ be the inner ...

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