lammps/doc/Eqs/pair_lj_expand.tex

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\documentclass[12pt]{article}
\begin{document}
$$
E = 4 \epsilon \left[ \left(\frac{\sigma}{r - \Delta}\right)^{12} -
\left(\frac{\sigma}{r - \Delta}\right)^6 \right]
\qquad r < r_c + \Delta
$$
\end{document}