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pair_eam.tex
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			\documentclass[12pt]{article}

			\begin{document}

			$$
			E_i = F_\alpha \left(\sum_{j \neq i}\ \rho_\alpha (r_{ij})\right) +
			\frac{1}{2} \sum_{j \neq i} \phi_{\alpha\beta} (r_{ij})
			$$

			\end{document}