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 == Product formula relation == 

 ""The Dirichlet series that generates the Möbius function is the (multiplicative) inverse of the Riemann zeta function 

 \sum_{n=1}^\infty \frac{\mu(n)}{n^s}=\frac{1}{\zeta(s)}. 
 This is easy to see from its Euler product"" 

 Why is it clear? Am i being stupid here?"