lammps/doc/Eqs/min_energy.tex

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\documentclass[12pt]{article}
\begin{document}
\begin{eqnarray*}
E(r_1,r_2, \ldots ,r_N) & = & \sum_{i,j} E_{\it pair}(r_i,r_j) +
\sum_{ij} E_{\it bond}(r_i,r_j) +
\sum_{ijk} E_{\it angle}(r_i,r_j,r_k) + \\
&& \sum_{ijkl} E_{\it dihedral}(r_i,r_j,r_k,r_l) +
\sum_{ijkl} E_{\it improper}(r_i,r_j,r_k,r_l) +
\sum_i E_{\it fix}(r_i)
\end{eqnarray*}
\end{document}