lammps/doc/Eqs/pair_eam_fs.tex

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\documentclass[12pt]{article}
\begin{document}
$$
E_i = F_\alpha \left(\sum_{j \neq i}\
\rho_{\alpha\beta} (r_{ij})\right) +
\frac{1}{2} \sum_{j \neq i} \phi_{\alpha\beta} (r_{ij})
$$
\end{document}