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This question already has an answer here:

Here I am, trying to display an equation that takes way too long for one line, so I called multline.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{geometry}
\usepackage{amssymb,amsmath}
\usepackage{amsfonts}
\geometry{a4paper}  
\begin{document}
\begin{multline}
S_E=\int \mathrm{d}t \left[\frac{(f'\dot{\xi})^2}{2} \int \mathrm{d}x(\phi_0+1)^2+\frac{f^2}{2}\int \mathrm{d}x \phi'^2\\
+ \int \mathrm{d}x (\psi^2-1)^2(\psi^2-\delta_1)
+ \frac{1}{\gamma+\psi^2}\left[\left(f^2(\phi_0^2+1)-2f(\phi_0+1)\right)^2-\frac{\delta_2{4}(f(\phi_0+1)-3)(f(\phi_0+1))^2\right]\right] \\
\label{actionrescale}
\end{multline}
\end{document}

However, if I called \begin{equation} and \end{equation} instead of \begin{multline} and \end{multline} the equation would show up just fine (or at least as much of it that could fit on the resulting pdf file). What exactly is wrong with this document?

marked as duplicate by Torbjørn T., Mico, Masroor, Thorsten, Guido Jul 5 '14 at 6:25

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Welcome to TeX.SX! You can't split \left[ ... \right] over multiple lines, use e.g. \biggl[ and \biggr] instead. – Torbjørn T. Jul 4 '14 at 21:57
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Here is a solution. I split it differently, and define a differential operator \d that has a correct spacing (it comes from one answer here, but I don't know where).

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{geometry}
\usepackage{amssymb,amsmath}
\usepackage{amsfonts}
\geometry{a4paper}

\renewcommand*{\d}{\mathop{}\mathopen{}\mathrm{d}}

\begin{document}

\begin{multline}
\label{actionrescale}
S_E=\int \d t \biggl[\frac{(f'\dot{\xi})^2}{2} \int (\phi_0+1)^2 \d x + \frac{f^2}{2}\int \phi'^2 \d x
+ \int (\psi^2-1)^2(\psi^2-\delta_1)\d x  \\ 
+ \frac{1}{\gamma+\psi^2}\Bigl[\left(f^2(\phi_0^2 + 1)-2f(\phi_0 + 1)\right)^2 -
 \frac{\delta_2}{4}\bigl(f(\phi_0 + 1)-3\bigr)\bigl(f(\phi_0 + 1)\bigr)^2\Bigr]\biggr]
\end{multline}

\end{document} 

enter image description here

  • There is no need for \biggr. and \biggl.. – Torbjørn T. Jul 5 '14 at 5:11
  • @Torbjørn T:: I need them not to have two consecutive ] at the end of the formula, thus improving legibility. I might as well have used two pairs \left - right. – Bernard Jul 5 '14 at 9:00
  • Huh? Unlike \left\right there is AFAIK no requirement to 'end' a \biggl with a corresponding \biggr. As far as I can see, the \biggr. and \biggl. do just about nothing. – Torbjørn T. Jul 5 '14 at 10:46
  • @Torbjørn T: You're right. I added those \biggr/l. because I mixed up on trying various solutions: it happened that I had a blank line and of course an error message, and thought I had to add those \biggl/r. I'll modify my answer at once. Thanks for pointing me this. – Bernard Jul 5 '14 at 12:06

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