在 align* 环境中出现“错误：额外的 }，或者忘记了 \right。”

Question

为什么我在以下环境中会出现“错误：额外的}，或者忘记了\right。” align*？

\begin{align*}
    \int\left[\left(\der{E_z}{y}-\der{E_y}{z}-\mu\der{\alpha}{t}\right)\alpha&+\left(\der{E_x}{z}-\der{E_x}{x}-\mu\der{\beta}{t}\right)\beta\\
    &+\left(\der{E_y}{x}-\der{E_x}{y}-\mu\der{\gamma}{t}\right)\gamma\left.\vphantom{\left(\der{E_y}{x}}\right]d\omega=0.
    \end{align*}

谢谢

Answer 1

这是一个multline*应该使用的情况；无论如何，你不能让\left其中\right一条线路不平衡。

\documentclass{article}
\usepackage{amsmath}
\newcommand{\der}[2]{\frac{\partial #1}{\partial #2}}

\begin{document}
\begin{multline*}
\int\biggl[
  \left(\der{E_z}{y}-\der{E_y}{z}-\mu\der{\alpha}{t}\right)\alpha
   +\left(\der{E_x}{z}-\der{E_x}{x}-\mu\der{\beta}{t}\right)\beta +{}\\
  \left(\der{E_y}{x}-\der{E_x}{y}-\mu\der{\gamma}{t}\right)\gamma
\biggr]\,d\omega=0.
\end{multline*}
\end{document}

（我猜测了 的定义\der。）

Answer 2

每一个都\left需要匹配一个对应的\right：

\begin{align*}
\int\left[\left(\der{E_z}{y}-\der{E_y}{z}-\mu\der{\alpha}{t}\right)\alpha\right.&+\left(\der{E_x}{z}-\der{E_x}{x}-\mu\der{\beta}{t}\right)\beta\\
&+\left(\der{E_y}{x}-\der{E_x}{y}-\mu\der{\gamma}{t}\right)\gamma\left.\vphantom{\left(\der{E_y}{x}\right)}\right]d\omega=0.
\end{align*}