# Error with \framebox inside $$I'm new to LaTeX, and I'm having an issue with using \framebox inside an equation (denoted with $$ signs at the beginning and the end).

The text that I'm trying to box is the following:

1.5 \times 10^{- 5} \; Pa


However, once I put a \framebox around it, like so:

\framebox{1.5 \times 10^{- 5} \; Pa}


I get the following error:

./assignment1.tex:85: Missing $inserted. ...where 85 points to the line where I put in the \framebox. Any ideas why this is happening? - Inside the argument to the \framebox, the outer math environment is lost. You must place the argument itself inside math delimiters (single $) –  Steven B. Segletes Jan 29 '14 at 2:05
If you want to keep the expression in displayed mode, you can load amsmath and use \boxed, as the following example shows: $\boxed{1.5 \times 10^{- 5} \; Pa}$ –  Gonzalo Medina Jan 29 '14 at 2:18

## 2 Answers

boxed will not span an equation if it encloses an alignment point i.e., & . In such cases you can use Aboxed from mathtools. See the example below for illustration. Further, to typeset units, better use siunitx.

\documentclass{article}
\usepackage{mathtools}
\usepackage{siunitx}
\begin{document}
\framebox{$1.5 \times 10^{- 5}\si{\pascal}$}
\begin{align}
&\boxed{1.5 \times 10^{- 5}\si{\pascal}}\\
\Aboxed{\text{Pressure} &=1.5 \times 10^{- 5}\si{\pascal}}
\end{align}
\end{document}


A useful read will be this Q and its A

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You wrote "\boxed will not span an entire equation" and that is not exactly true. \boxed will span an entire equation unless the box should cross an alignment point. –  Gonzalo Medina Jan 29 '14 at 2:51
No problem :-) I'll delete this comment, and the previous one, shortly. –  Gonzalo Medina Jan 29 '14 at 13:28

Package amsmath provides a command, namely \boxed, to generate boxed math.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
$\boxed{E = mc^2}$

$\boxed{E =mc^2}$
\end{document}


BTW, do NOT use , see here for details.

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