```md
$ a_1 $
```
$ a_1 $
```md
$ a_{123} $
```
$ a_{123} $
by ZihanHu @ 2022-01-16 10:24:37
这个只能算 $\LaTeX$ 吧(
by Shiota_Kaede @ 2022-01-16 10:30:01
这是 $\KaTeX$ / $\LaTeX$，不是 Markdown
by yuchenren @ 2022-01-16 10:38:12