Markdown 常用的表达式

常用数学LaTex公式$\sqrt{ab}$$\sqrt[n]{ab}$$\log_{a}{b}$$\lg{ab}$$a^{b}$$a_{b}$$x_a^b$$\int$$\int_{a}^{b}$$\oint$$\oint_a^b$$\sum$$\sum_a^b$$\coprod$$\coprod_a^b$$\prod$$\prod_a^b$$\bigcap$$\bigcap_a^b$$\bigcup$$\bigcup_a^b$$\bigsqcup$$\bigsqcup_a^b$$\bigvee$$\bigvee_a^b$$\bigwedge$$\bigwedge_a^b$$\widetilde{ab}$$\widehat{ab}$$\overleftarrow{ab}$$\overrightarrow{ab}$$\overbrace{ab}$$\underbrace{ab}$$\underline{ab}$$\overline{ab}$$\frac{ab}{cd}$$\frac{\partial a}{\partial b}$$\frac{\text{d}x}{\text{d}y}$$\lim_{a \rightarrow b}$