latex还是很不错的, typora也支持
括号
\[中括号, 小括号也是同理...
\left\{
\begin{matrix}
1 & \cdots & b^c \\
6 & ... & a_b \\
\vdots & \ddots & \vdots \\
\alpha & \cdots & \alpha+4
\end{matrix}
\right\}
\\
...这个可能简单些...
\begin{Bmatrix}
1 & 2 & 3 \\
4 & 5 & 6 \\
7 & 8 & 9
\end{Bmatrix}
\begin{bmatrix}
1 & 2 & 3 \\
4 & 5 & 6 \\
7 & 8 & 9
\end{bmatrix}\]
\[...矢量...\vec \epsilon
... 行列式 ...
\begin{vmatrix}
1 & 2 & 3 \\
4 & 5 & 6 \\
7 & 8 & 9
\end{vmatrix}\]
\[... 表格 ...
\begin{array}{|c|lc|r}
\hline 23&333&44&3\\
7&5&344&88\\
\hline 633&31&8&9\\
7&5&344&88\\
\hline
\end{array}\]
半括号
\[\begin{cases}
3x + 5y + z \\
7x - 2y + 4z \\
-6x + 3y + 2z
\end{cases}
...
\begin{cases}
n/2, & \text{if }n\text{ is even} \\
3n+1, & \text{if }n\text{ is odd}
\end{cases}\]
sigam
\[优化目标: \sum_{a=1,i=1}^{n}{x_{ai}c_{ai}} \\限制条件: \sum_{i=1}^nx_{ai}=2, \forall正整数a\]
\[\prod_{i=1}^nx_{ai}=2 ...\]
\[\lim_{i=1}^nx_{ai}=2\]
\[\int _1^n x^2 dx\]
符号
\[a^b...a_b\]
\[\infty/0...
a\div b...
a\pm b...
\frac a b...
\sqrt b\]
\[\sin \theta
\cos \beta
\tan \delta
\cot \gamma\]
\[\psi \leq \omega...
\chi \geq \varphi\]
\[\begin{aligned}
a &= b + c \\
&= d + e + f
\end{aligned}\]
\[a\!b + ab + a\,b + a\;b + a\ b + a\quad b + a\qquad b\]
字符
\[\forall...
\infty...
\emptyset...
\exists...
\nabla...\\
\bot...
\angle...
\because...
\therefore...
\in\]
\[\alpha ...
\beta ...
\gamma ...
\delta ...
\epsilon ...\\
\varepsilon ...
\zeta ...
\eta ...
\theta ...
\iota ...\\
\kappa ...
\lambda ...
\mu ...
\nu ...
\xi ...\\
\omicron ...
\pi ...
\rho ...
\sigma ...
\tau ...\\
\upsilon ...
\phi ...
\varphi ...
\chi ...
\psi ...\\
\omega ...\]
集合
\[A \cup B
...
a \cap m
...
e^\complement f
...
g \overline h
\\
i^ \sim h
...
j^ \mathsf h
...
k\setminus h
...
l\widetilde a
\\
{\overline{A \cup B}}\]
除法
\[\frac{\alpha \cup \beta}{b}\]