How to strike out inside LaTeX equations?

It looks like the \sout doesn't work inside a math env. You can try doing something like this, which works:

\documentclass{article}
\usepackage{ulem}
\begin{document}
The sout tag works perfect in the \sout{main text area} but not inside the equations.

$list = $[1, \sout{2}, 3, \sout{4}, 5, \sout{6}, 7, \sout{8}, 9, \sout{10}$]$

Any clue?
\end{document}

If you need to keep the strikeout in Math mode (e.g., to keep Math fonts) try:

\newcommand{\msout}[1]{\text{\sout{\ensuremath{#1}}}}

then

$\msout{\mathsf{stuckout}}$

you need amsmath and ulem.

(Solution from here.)

If anyone's still interested, I just found out about the cancel package, which allows you to strike your text in math mode in a few different ways. It's not horizontal, though -- only diagonal, which in my case is much better.