LaTeX

Official site:latex-project.org

截图识别为latex的工具:Mathpix snip,

LaTeX 入门与进阶 -- 二花

latex_math_symbol_tables.pdf

lshort-cn.pdf

数学符号备查表

这个讲解得不错; 示例:

f(n) =
\begin{cases}
n/2 & \quad \text{if } n \text{ is even} \\
-(n+1)/2 & \quad \text{if } n \text{ is odd}\\
\end{cases}

表示: $$f(n) = \begin{cases} n/2 & \quad \text{if } n \text{ is even} \\ -(n+1)/2 & \quad \text{if } n \text{ is odd}\\ \end{cases}$$

十字分割 $$\begin{array}{c|c} 1 & 2 \\ \hline 3 & 4 \end{array}$$

矩阵 $$A_{m,n} = \begin{pmatrix} a_{1,1} & a_{1,2} & \cdots & a_{1,n} \\ a_{2,1} & a_{2,2} & \cdots & a_{2,n} \\ \vdots & \vdots & \ddots & \vdots \\ a_{m,1} & a_{m,2} & \cdots & a_{m,n} \end{pmatrix}$$