lammps/doc/Eqs/pair_granular.tex

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\documentclass[12pt]{article}
\begin{document}
$$
F = f\left(\delta/d\right)\left(k_n \delta \mathbf{n}_{ij} -
m_{\mbox{\scriptsize{eff}}} \gamma_n\mathbf{ v}_n\right) +
f\left(\delta/d\right)\left(-k_t \delta\mathbf{ \Delta s}_t -
m_{\mbox{\scriptsize{eff}}} \gamma_t \mathbf{v}_t\right)
$$
\end{document}