Loading docs/math/mobius.md +1 −1 Original line number Diff line number Diff line Loading @@ -410,7 +410,7 @@ $$ \frac{1}{2}\cdot\sum_{d\mid n}\frac{n^2\cdot\varphi(\frac{n}{d})}{d}+\frac{n}{2} $$ 变换求和顺序，设 $\displaystyle d'=\frac{n}{d}$ ，提供公因式，式子化为 变换求和顺序，设 $\displaystyle d'=\frac{n}{d}$ ，合并公因式，式子化为 $$ \frac{1}{2}n\left(\cdot\sum_{d'\mid n}d'\cdot\varphi(d')+1\right) Loading Loading
docs/math/mobius.md +1 −1 Original line number Diff line number Diff line Loading @@ -410,7 +410,7 @@ $$ \frac{1}{2}\cdot\sum_{d\mid n}\frac{n^2\cdot\varphi(\frac{n}{d})}{d}+\frac{n}{2} $$ 变换求和顺序，设 $\displaystyle d'=\frac{n}{d}$ ，提供公因式，式子化为 变换求和顺序，设 $\displaystyle d'=\frac{n}{d}$ ，合并公因式，式子化为 $$ \frac{1}{2}n\left(\cdot\sum_{d'\mid n}d'\cdot\varphi(d')+1\right) Loading
