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====== 数学公式 ======
===== 常见用法 =====
mathjax 是很强大的！很多时候不需要大家自创格式：
向下取整 $\lfloor\frac{a}{b}\rfloor$
向上取整 $\lceil\frac{a}{b}\rceil$
高次开方 $\sqrt[3]{n}$
同余式 $a\equiv b\pmod{c}$
取模 $a\bmod{b}=c$
===== 美化公式 =====
当括号中内容较大时，使用 ''\left\right'' 来使括号同步放缩。
例如：
$$\left\lfloor\frac{n}{\left\lfloor\frac{n}{l}\right\rfloor}\right\rfloor$$
$$\left|\frac{a}{\left|\frac{b}{c}\right|}\right|$$