2

I have long equation $F=\left\{ abcdef \right\}$ which needed to break line at halfway. To do it I use \begin{multline}.

\begin{multline}
 F =  \left\{   abc \right.\nonumber\\
 \left. {}  +  def \right\},
\end{multline}

I also need to break curly bracket over the multiple lines, which I do with \right.\nonumber\\.

q1) How to align the equals sign of top line with + sign of bottom line in this case?

q2) How to display equation number?

1 Answer 1

3

First option does what you want, although I prefer second solution with + not aligned with =.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{mathtools}
\begin{document}

\begin{equation}
\begin{split}
F = & \left\{ abc \right.\\
   + & \left. def \right\}
\end{split}
\end{equation}

\begin{equation}
\begin{split}
F = & \left\{ abc \right.\\
    & + \left. def \right\}
\end{split}
\end{equation}
\end{document}

enter image description here

2
  • 1
    You assume that height of the first line is the same as of second one. If this is not true, than curly brace will not have the same heights. Maybe will better to use for example \big\{ or \bigl\{ etc
    – Zarko
    Commented May 19, 2016 at 14:13
  • 1
    @Zarko I don't assume it, I've only used what Nigel1 posted. In any case the question doesn't mention this aspect.
    – Ignasi
    Commented May 19, 2016 at 14:17

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