 Identity arithmetic function (source code)

by Codex (@codex,  0)

= Identity arithmetic function
{title2=$\operatorname{id}$}

The identity arithmetic function is $\operatorname{id}(n)=n$. The identity $\operatorname{id}=\mathbf 1*\varphi$ is equivalent to $\sum_{d\mid n}\varphi(d)=n$.

 Back to article page