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%%  Example 01-08-6 
%%  Copyright (C) 2017 Herbert Voss
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\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{328.62788pt}

%StartShownPreambleCommands

%StopShownPreambleCommands
\begin{document}
\arraycolsep=1.4pt
\begin{equation}
\begin{array}{rcl}
	\frac{1}{2}\Delta(f_{ij}f^{ij}) & = & 2\Bigg({\displaystyle
	\sum_{i<j}}\chi_{ij}(\sigma_{i}-\sigma_{j})^{2}+f^{ij}%
	\nabla_{j}\nabla_{i}(\Delta f)+\\
&	& +\nabla_{k}f_{ij}\nabla^{k}f^{ij}+f^{ij}f^{k}[2
	\nabla_{i}R_{jk}-\nabla_{k}R_{ij}]\Bigg)
\end{array}
\end{equation}
\end{document}
