# Newline within underbrace in math environment [duplicate]

Possible Duplicate:
How can I force a line break within \text{…}?

In the MWE below, is it possible to force a line break in the text under the Z so that the overall equation is more compact in the horizontal direction? I tried a normal linebreak, which I hoped would work since it's inside a \text, but that gave me errors.

Also, if there's a better way to make this sort of equation callout, please let me know. \underbrace and underset and variants thereon are the only methods I'm familiar with at present.

The Cauchy-Schwartz equation below from the Navier-Stokes Wiki article shows the kind of line breaks I was hoping to get in the underbrace.

MWE

\documentclass[12pt]{article}
\usepackage{amsmath}
\begin{document}
$\underbrace{z}_{\text{Initial Acceleration}} = x + y$
\end{document}


Underbrace linebreaks:

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Or this one: tex.stackexchange.com/questions/30862/… –  cmhughes Oct 8 '11 at 18:47
The question linked by Torbjorn T. does answers my question. However, I did not find it through any searches, which is why I asked it here. Thanks. –  SSilk Oct 8 '11 at 20:37
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## marked as duplicate by Torbjørn T., lockstep, Gonzalo Medina, Caramdir, SSilkOct 8 '11 at 20:37

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.

## 1 Answer

See pp 117 in http://mirror.ctan.org/info/math/voss/mathmode/Mathmode.pdf for a better vertical alignment.

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