> For the complete documentation index, see [llms.txt](https://docs.zhizhiyang.cn/raphaels-knowledgebase-beta/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zhizhiyang.cn/raphaels-knowledgebase-beta/intro/latex-guide.md).

# Latex tips - Latex 漫游指南

## `\underbrace{equation}_{\text{comment}}`

![image-20241106140028418](/files/4ci1nKRLoIkWwZjWpgKV)

$$
\underbrace{\text{This is }\LaTeX{}}\_{\text{This is the comment}}
$$

可以用`\underbrace`来注释公式中的不同部分，效果如下：

$$
S\_{\text{out}}(\omega) = \frac{1}{2} P\_o \textcolor{ForestGreen}{}I\_{\text{ff}} \Bigg\[ &
\underbrace{\cos^2 A \cdot J\_0^2(B\_1) \cdot e^{-\alpha L} \delta(\omega + \omega\_c) }\_{\text{Carrier}}

* \underbrace{\sin^2 A \cdot J\_1^2(B\_1) \cdot e^{-\alpha L} g\_B \delta(\omega + \omega\_c - \omega\_s)}*{\text{frequency-shifted signal, wanted}} \notag \\
  &+ \sin^2 A \cdot J\_1^2(B\_1) \cdot e^{-\alpha L} \frac{1}{g\_B} \delta(\omega + \omega\_c + \omega\_s) + N*{\text{SBS},c}(\omega) + N\_{\text{SBS},l}(\omega) \notag \\
  &+ N\_{\text{SBS},u}(\omega) +
  \Bigg{ \underbrace{\cos^2 A \cdot J\_0^2(B\_2) \cdot \delta(\omega + \omega\_c) + \sin^2 A \cdot J\_1^2(B\_2) \cdot \delta(\omega + \omega\_c - \omega\_p)}*{{S*{pump, in}(\omega)}} \notag \\
  & \underbrace{+\sin^2 A \cdot J\_1^2(B\_2) \cdot \delta(\omega + \omega\_c + \omega\_p)}*{{S*{pump, in}(\omega)}} \Bigg} \times G \left( \frac{S\_c}{2} (1 - e^{-2 \alpha L}) \right) \Bigg]
  $$