数学公式用法

https://blog.csdn.net/fencecat/article/details/123530441

$$f(x) = \frac 1 {\sqrt{2\pi} \sigma}{\rm e} ^{-\frac{(x-\mu)^2}{2\sigma^2}}$$ $$f(x) = \frac 1 {\sqrt{2\pi} \sigma}\exp\left [ {-\frac{(x-\mu)^2}{2\sigma^2}}\right ]$$ $$\lim\limits_{N\to \infty} P \left\{ \left|\frac{I(\alpha_{i})}{N}-H(s) \right| <\varepsilon\right\}=1$$ $$\frac{\partial f}{\partial x}|_{x=0}$$ $$\left.\frac{\partial f}{\partial x}\right|_{x=0}$$