Logarithm of a formal power series
= Logarithm of a formal power series
{title2=$\log(1+u)=\sum_{k\ge1}(-1)^{k+1}u^k/k$}
= Formal power series logarithm
{synonym}
= Logarithm of a formal power series
{title2=$\log(1+u)=\sum_{k\ge1}(-1)^{k+1}u^k/k$}
= Formal power series logarithm
{synonym}