方括号
$$ a = \left[ \matrix{ \alpha_1 & test1\\ \alpha_2 & test2\\ \alpha_3 & test3 } \right] $$
大括号
$$ a = \pmatrix{ \alpha_1 & test1 & test4\\ \alpha_2 & \vdots & test5\\ \alpha_2 & \ddots & test6\\ \alpha_3 & \cdots & test7 } $$
方程式
$$ f(n)= \begin{cases} n/2, & \text{if $n$ is even}\\ 3n+1,& \text{if $n$ is odd} \end{cases} $$
希腊字母
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