LaTex数学符号整理

记录常用的Tex/md写数学公式的使用频率一般，每次都记不住的符号，完整符号可参考下面两个链接。

https://katex.org/docs/supported.html

https://blog.csdn.net/ying_xu/article/details/51240291

code	show
\epsilon	$ϵ$
\varepsilon	$\epsilon$
\tau	$\tau$
\Omega	$\Omega$
\Psi	$\Psi$
\upsilon	$\upsilon$
\leq or \le	$\le$
\geq or \ge	$\ge$
\equiv	$\equiv$
\in	$\in$
\ni	$\ni$
\mid	$\mid$
\neq or \ne	$̸=$
\notin	$\notin$
\pm	$\pm$
\int	$\int$
\oint	$\oint$
\leftarrow or \gets	$\leftarrow$
\rightarrow or \to	$\to$
\longleftarrow	$⟵$
\longrightarrow	$⟶$
\Leftarrow	$\Leftarrow$
\Rightarrow	$\Rightarrow$
\leftrightarrow	$\leftrightarrow$
\Leftrightarrow	$\iff$
\rightleftharpoons	$\rightleftharpoons$
\dots	$\dots$
\cdots	$\cdots$
\vdots	$⋮$
\ddots	$\ddots$
\exists	$\exists$
\partial	$\partial$
\triangle	$△$

一些常用数学公式格式

1. 符号对齐

\begin{alignedat}{2}
   10&x+ &3&y = 2 \\
   3&x+&13&y = 4
\end{alignedat}

$\begin{array}{rlrl}10& x+& 3& y=2\\ 3& x+& 13& y=4\end{array}$

2. 大括号

x = \begin{cases}
   a &\text{if } b \\
   c &\text{if } d
\end{cases}

$x=\{\begin{array}{ll}a& \text{if }b\\ c& \text{if }d\end{array}$

3. 等号对齐

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

$\begin{array}{rl}a& =b+c\\ d+e& =f\end{array}$

4. 极限

\lim_{x \rightarrow 0}\frac{\sin x}{x}=1\`

$\underset{x\to 0}{\lim }\frac{\sin x}{x}=1$

5. 矩阵

\begin{matrix}
\mathbf{X} =
\left( \begin{array}{ccc}
x_{11} & x_{12} & \ldots \\
x_{21} & x_{22} & \ldots \\
\vdots & \vdots & \ddots
\end{array} \right)
\end{matrix}

$\begin{array}{c}\mathbf{X}=\left(\begin{array}{ccc}{x}_{11}& x_{12}& \dots \\ x_{21}& x_{22}& \dots \\ ⋮& ⋮& \ddots \end{array}\right)\end{array}$

6. 长方程换行

\begin{eqnarray}
\sin x & = & x -\frac{x^{3}}{3!}
+\frac{x^{5}}{5!}-{}
\nonumber\\
& & {}-\frac{x^{7}}{7!}+{}\cdots
\end{eqnarray}

KaTeX parse error: No such environment: eqnarray at position 7: \begin{̲e̲q̲n̲a̲r̲r̲a̲y̲}̲ \sin x & = & x…