Why do I get a "ERROR: Extra }, or forgotten \right." in the following align* environment?




This is a case where multline* should be used; in any case you can't have unbalanced \left or \right in one of the lines.

\newcommand{\der}[2]{\frac{\partial #1}{\partial #2}}

   +\left(\der{E_x}{z}-\der{E_x}{x}-\mu\der{\beta}{t}\right)\beta +{}\\

(I guessed at the definition of \der.)

enter image description here

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  • Thanks, but I wanted alignment. (Yes, your guess of \der is right. ☺) – Geremia Oct 10 '13 at 15:10
  • 1
    @Geremia No, you don't want vertical alignment. ;-) – egreg Oct 10 '13 at 15:43

Every \left needs to be matched with a corresponding \right:

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