\documentclass[12pt]{article}
\pagestyle{empty}
\begin{document}
\begin{displaymath}
p_{\rm trial}^{\rm arb}({\bf r}_i) =
{
{1}
\over
{V_{\rm cell}}
}
\times
{
{X_{\rm cell}}
\over
{\sum X_{\rm cell}}
}
\end{displaymath}
\end{document}
distrib
>
Fedora
>
14
>
x86_64
>
media
>
updates
>
by-pkgid
>
2f8321c8e2a11ea8b160a642cfc9fd7f
>
files
>
126
