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How to prove$\forall n\ge5 $

$$\phi(n)\ge \frac{n}{6\log \log (n)} $$

$\phi$ is Euler function

Thanks in advance

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See math.stackexchange.com/questions/101654/… for an even stronger result –  Cocopuffs May 20 '13 at 19:51
@Cocopuffs :thanks –  Maisam Hedyelloo May 21 '13 at 15:39

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