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The multline environment does exactly what I want in splitting a long formula between lines by utilizing the horizontal space to the fullest. (I don't want the alignment features of the align environment.)

The problem is, I want to vertically center the equation number, as opposed to making it appear on the second line (as it does by default).

How do I do this?

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I thought that maybe \raisetag could help, but it doesn't have any effect if the tag was not shifted from it's natural position... –  Jellby Jun 26 '12 at 8:06

3 Answers 3

up vote 9 down vote accepted

What you want is the multlined environment provided by mathtools:

\documentclass{article}
\usepackage{mathtools}

\begin{document}

\begin{equation}
\begin{multlined}
a+b+c+d+e+f+{}\\
g+h+i+j
\end{multlined}
\end{equation}

\end{document}

enter image description here

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Try to use this:

\begin{equation}\label{xx}
\begin{split}
 a&= b+c-d\\
  & \quad +e-f\\
  &= g+h\\
  &= i
\end{split}
\end{equation}`
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This answer is really just an addendum to/augmentation of the answer provided by @Thiago on the use of a split environment within an equation environment to get the vertical centering of the equation number.

  • Normally, one uses the split environment to align successive lines on a single common point -- frequently, not necessarily, an = sign.

  • However, by leaving off the align symbol, &, entirely from two (or more) consecutive lines, the resulting lines will simply be centered, one line after the other.

  • Other alignment possibilities exist too. For example, the following code,

    \begin{equation} \begin{split}
    a+b+c+{}&d=\\
    &e+f+g+h
    \end{split} \end{equation}
    

    serves to have the e of the second line be placed exactly below the d of the first line.

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