LaTeX package: delarray

在数组(array)上方便添加括号, 如
\begin{array}({cc})
a & b\\
c & d\\
\end{array}
\begin{equation}
f(x)=
\begin{array}\{{lr}.
0 & \text{if} x=0; \\
1 & \text{if} x>0; \\
-1& \text{if} x<0.>
尤其和 [t], [b] 等一起用更显有效.

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