lammps/doc/Eqs/pair_smtbq2.tex

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\documentclass[12pt]{article}
\begin{document}
\begin{eqnarray*}
E_{cov}^{i(i=M,O)} & = & - \Bigg\{\eta_i(\mu \xi^{0})^2 f_{cut}^{r_{c1}r_{c2}}(r_{ij})
\Bigg( \sum_{j(j=O,M)}{ exp[ -2q(\frac{r_{ij}}{r_0} - 1)] } \Bigg)
\delta Q_i \Big( 2\frac{n_0}{\eta_i} - \delta Q_i \Big) \Bigg\}^{1/2} \\
\delta Q_i & = & | Q_i^{F} | - | Q_i |
\end{eqnarray*}
\end{document}