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sjplimp
2008-06-23 16:06:46 +00:00
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\documentclass[12pt]{article}
\begin{document}
\begin{eqnarray*}
E(r_1,r_2, \ldots ,r_N) & = & \sum_{i,j} \phi_{i,j}(r_i,r_j) +
\sum_{ij} B_{i,j}(r_i,r_j) +
\sum_{ijk} A_{i,j}(r_i,r_j,r_k) + \\
&& \sum_{ijkl} D_{i,j}(r_i,r_j,r_k,r_l) +
\sum_{ijkl} I_{i,j}(r_i,r_j,r_k,r_l) +
\sum_i F_i(r_i)
\end{eqnarray*}
\end{document}