[問題] 矩陣打出來兩行間格不夠
\frac{1}{r}
\left|\begin{matrix}
\hat {\v{r}} & \hat {\v{\theta}} & \hat {\v{z}} \\
\pd{}{r} & \pd{}{\theta} & \pd{}{z} \\
0 & r^2 \Omega & 0
\end{matrix}
怎麼辦? 難道要自己調間距?
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