Block

边框

\left{([|.
\right{([|.

环境

\begin{}
\end{}

• bmatrix
• pmatrix
• array{c:cc}

分割线示例

$$\begin{pmatrix} a_{11} & a_{12} & a_{13} \\ \hdashline a_{21} & a_{22} & a_{23} \\ a_{31} & a_{32} & a_{33} \end{pmatrix}$$

$$\left[ \begin{array}{c|c:c} a_{11} & a_{12} & a_{13} \\ \hline a_{21} & a_{22} & a_{23} \\ \hdashline a_{31} & a_{32} & a_{33} \end{array} \right]$$

$$\begin{array}{|c:c}a & a & a & a & a\end{array}$$

$$\left| \begin{pmatrix} a\\ b \end{pmatrix} \right|$$