lammps/doc/Eqs/pair_coul_diel.tex

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\documentclass[12pt]{article}
\pagestyle{empty}
\begin{document}
\begin{eqnarray*}
E & = & \frac{Cq_iq_j}{\epsilon r} \left( \frac{\epsilon}{\epsilon_D(r)}-1\right) \qquad r < r_c \\
\epsilon_D(r) & = & \frac{5.2+\epsilon}{2} + \frac{\epsilon-5.2}{2}\tanh\left(\frac{r-r_{me}}{\sigma_e}\right)
\end{eqnarray*}
\end{document}