%%
%% An UIT Edition example
%%
%% Example 04-05-10 on page 41.
%%
%% Copyright (C) 2010 Herbert Voss
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See
http://www.latex-project.org/lppl.txt for details.
%%
%%
%% ====
% Show page(s) 1
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{12}
\renewcommand\theequation{4.\arabic{equation}}
\StartShownPreambleCommands
\everymath{\displaystyle}
\StopShownPreambleCommands
\begin{document}
\begin{equation}
\frac{1}{2}\,\Delta(f_{ij}\,f^{ij})=2\times\left(\sum_{i<j}\chi_{ij}
\left(\sigma_{i}-\sigma_{j}\right)^{2}+f^{ij}\nabla_{j}\nabla_{i}
(\Delta f)+\nabla_{k}f_{ij}\nabla^{k}f^{ij}+f^{ij}f^{k}
\left[2\nabla_{i}R_{jk}-\nabla_{k}R_{ij}\right]\right)
\end{equation}
\end{document}
