lammps/doc/Eqs/pair_airebo.tex

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\documentclass[12pt]{article}
\begin{document}
$$
E = \frac{1}{2} \sum_i \sum_{j \neq i}
\left[ E^{REBO}_{ij} + E^{LJ}_{ij} +
\sum_{k \neq i,j} \sum_{l \neq i,j,k} E^{TORSION}_{kijl} \right]
$$
\end{document}