Mobius
Mobius
形式一
\[ f\left(n\right) = \sum_{d|n}g\left(d\right) \\
g\left(n\right) = \sum_{d|n}\mu\left(d\right)f\left(\frac{n}{d}\right)
\]
形式二
\[ f\left(n\right) = \sum_{n|d}g\left(d\right) \\
g\left(n\right) = \sum_{n|d}\mu\left(\frac{d}{n}\right)f\left(d\right)
\]
