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%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 04-05-12 auf Seite 45.
%%  Copyright (C) 2018 Herbert Voss
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\begin{document}
\begin{equation}\setlength\arraycolsep{2pt}
\begin{array}{rcl}
\displaystyle % f��r gleiche Gr����en
\frac{1}{2}\,\Delta(f_{ij}\,f^{ij}) & = & 2\cdot\left(\sum\limits_{i<j}\chi_{ij}
    \left(\sigma_{i}-\sigma_{j}\right)^{2}+f^{ij}\nabla_{j}\nabla_{i}
    (\Delta f) \right. \\[8pt]
    & & {}+\left.\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{array}
\end{equation}
\end{document}