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lammps/doc/Eqs/min_energy.tex
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min_energy.tex
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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}