Posted by haifeng on 2016-04-05 19:46:28 last update 2016-04-05 19:46:28 | Answers (0) | 收藏
\[ \Bigl(\frac{p}{q}\Bigr)\Bigl(\frac{q}{p}\Bigr)=(-1)^{\frac{p-1}{2}\cdot\frac{q-1}{2}} \]
