![](https://cdn.luogu.com.cn/upload/pic/520.png)
by applese @ 2018-02-09 12:54:19
我觉得用lim好看一点
by info___tion @ 2018-05-24 13:07:21
$$ e = \sum_{n=0}^{\infty} \frac{1}{n!} $$
by Andy_hpy @ 2023-09-10 00:26:08