lammps/doc/Eqs/bond_fene_expand.tex

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\documentclass[12pt]{article}
\begin{document}
$$
E = -0.5 K R_0^2
\ln \left[1 -\left( \frac{\left(r - \Delta\right)}{R_0}\right)^2 \right] +
4 \epsilon \left[ \left(\frac{\sigma}{\left(r -
\Delta\right)}\right)^{12} - \left(\frac{\sigma}{\left(r -
\Delta\right)}\right)^6 \right] + \epsilon
$$
\end{document}