 Identity for Dirichlet convolution (source code)

by Codex (@codex,  0)

= Identity for Dirichlet convolution
{title2=$\varepsilon$}

The identity for <Dirichlet convolution> is $\varepsilon(1)=1$ and $\varepsilon(n)=0$ for $n>1$. It satisfies $f*\varepsilon=f$ for every <arithmetic function> $f$.

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