单行公式（行内）：
~~~
`$ c = \pm\sqrt{a^2 + b^2} $`
~~~
效果如下：`$ c = \pm\sqrt{a^2 + b^2} $`
<br/>
多行写法（多行公式会居中显示）：
~~~
```[tex]
f(x) = \int_{-\infty}^\infty
\hat f(\xi)\,e^{2 \pi i \xi x} \,d\xi
```
~~~
效果如下：
```[tex]
f(x) = \int_{-\infty}^\infty
\hat f(\xi)\,e^{2 \pi i \xi x} \,d\xi
```
LaTex 官方文档：[https://katex.org/docs/supported.html](https://katex.org/docs/supported.html)
# 速查表
## 希腊字母
| 命令 | 显示 | | 命令 | 显示 |
| --- | --- | --- | --- | --- |
| \\alpha | `$ \alpha $` | | \\beta | `$ \beta $` |
| \\gamma | `$ \gamma $` | | \\delta | `$ \delta $` |
| \\epsilon | `$ \epsilon $` | | \\zeta | `$ \zeta $` |
| \\eta | `$ \eta $` | | \\theta | `$ \theta $` |
| \\iota | `$ \iota $` | | \\kappa | `$ \kappa $` |
| \\lambda | `$ \lambda $` | | \\mu | `$ \mu $` |
| \\xi | `$ \xi $` | | \\nu | `$ \nu $` |
| \\pi | `$ \pi $` | | \\rho | `$ \rho $` |
| \\sigma | `$ \sigma $` | | \\tau | `$ \tau $` |
| \\upsilon | `$ \upsilon $` | | \\phi | `$ \phi $` |
| \\chi | `$ \chi $` | | \\psi | `$ \psi $` |
| \\omega | `$ \omega $` | | |
如果使用大写的希腊字母，把命令的首字母变成大写即可，例如`\Gamma`输出的是`$ \Gamma $`
## 和号和积分号
| 命令 | 显示 | | 命令 | 显示 |
| --- | --- | --- | --- | --- |
| \\sum | `$ \sum $` | | \\int | `$ \int $` |
| \\sum_{i=1}^{N} | `$ \sum_{i=1}^{N} $` | | \\int_{a}^{b} | `$ \int_{a}^{b} $` |
| \\prod | `$ \prod $` | | \\iint | `$ \iint $` |
| \\prod_{i=1}^{N} | `$ \prod_{i=1}^{N} $` | | \\iint_{a}^{b} | `$ \iint_{a}^{b} $` |
| \\bigcup | `$ \bigcup $` | | \\bigcap | `$ \bigcap $` |
| \\bigcup_{i=1}^{N} | `$ \bigcup_{i=1}^{N} $` | | \\bigcap_{i=1}^{N} | `$ \bigcap_{i=1}^{N} $`
## 其他常用命令
| 命令 | 显示 | | 命令 | 显示 |
| --- | --- | --- | --- | --- |
| \\sqrt[3]{2} | `$ \sqrt[3]{2} $` | | \\sqrt{2} | `$ \sqrt{2} $` |
| x^{3} | `$ x^{3} $` | | x_{3} | `$ x_{3} $` |
| \lim_{x \to 0} | `$ \lim_{x \to 0} $` | | \frac{1}{2} | `$ \frac{1}{2} $` |
数字放到符号正下方：
如果是数学符号，那么直接用 \limits 命令放在正下方，如：
```
$ \sum\limits_{i=1} $
```
若是普通符号，那么要用 \mathop 先转成数学符号再用 \limits，如
```
$ \mathop{a}\limits_{i=1} $
```
效果：
```[tex]
\sum\limits_{i=1}
```
```[tex]
\mathop{a}\limits_{i=1}
```
