lammps/doc/Eqs/pair_gran_hertz.tex

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\documentclass[12pt]{article}
\begin{document}
$$
F_{hz} = \sqrt{\delta} \sqrt{\frac{R_i R_j}{R_i + R_j}} F_{hk} =
\sqrt{\delta} \sqrt{\frac{R_i R_j}{R_i + R_j}}
\Big[ (k_n \delta \mathbf{n}_{ij} -
m_{\mbox{\scriptsize{eff}}} \: \gamma_n \mathbf{ v}_n) -
(k_t \delta\mathbf{ \Delta s}_t +
m_{\mbox{\scriptsize{eff}}} \: \gamma_t \mathbf{v}_t) \Big]
$$
\end{document}