markdown 大全| 符号、注意点、公式

等号对齐

使用\begin{aligned}和\end{aligned}和&=

$$
\begin{aligned}
a &= b + c \\
  &= d + e
\end{aligned}
$$

\[\begin{aligned} a &= b + c \\ &= d + e \end{aligned} \]

坐标在下面

用\underset{}{}

$k_n := arg\underset{k_n}{min}A$

\(k_n := arg\underset{k_n}{min}A\)

公式里添加空格

一个空格：\ ；四个空格：\quad

a = log\ p, \quad p > 0

\(a = log\ p, \quad p > 0\)

字母上面的符号

符号	语法
\(\vec{a}\)	\vec
\(\hat{a}\)	\hat
\(\widehat{a}\)	\widehat
\(\overline{a}\)	\overline
\(\bar{a}\)	\bar
\(\widetilde{a}\)	\widetilde
\(\tilde{a}\)	\tilde
\(\dot{a}\)	\dot
\(\ddot{a}\)	\ddot

字母的不同花体

1. \mathcal
   \(\mathcal{A},\mathcal{B},\mathcal{C},\mathcal{D},\mathcal{E},\mathcal{F},\mathcal{G}\)
   \(\mathcal{H},\mathcal{I},\mathcal{J},\mathcal{K},\mathcal{L},\mathcal{M},\mathcal{N}\)
   \(\mathcal{O},\mathcal{P},\mathcal{Q},\mathcal{R},\mathcal{S},\mathcal{T},\mathcal{U}\)
   \(\mathcal{V},\mathcal{W},\mathcal{X},\mathcal{Y},\mathcal{Z}\)

2. \mathbb
   \(\mathbb{A},\mathbb{B},\mathbb{C},\mathbb{D},\mathbb{E},\mathbb{F},\mathbb{G}\)
   \(\mathbb{H},\mathbb{I},\mathbb{J},\mathbb{K},\mathbb{L},\mathbb{M},\mathbb{N}\)
   \(\mathbb{O},\mathbb{P},\mathbb{Q},\mathbb{R},\mathbb{S},\mathbb{T},\mathbb{U}\)
   \(\mathbb{V},\mathbb{W},\mathbb{X},\mathbb{Y},\mathbb{Z}\)

常见符号

符号	语法	描述
\(\pm\)	\pm	正负号
\(\sim\)	\sim	波浪线
\(\partial\)	\partial	偏导符号
\(\prime\)	\prime	右上方一撇