lammps/doc/Eqs/fix_wall_lj1043.tex

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$$
E = 2 \pi \epsilon \left[ \frac{2}{5} \left(\frac{\sigma}{r}\right)^{10} -
\left(\frac{\sigma}{r}\right)^4 -
\frac{\sqrt(2)\sigma^3}{3\left(r+\left(0.61/\sqrt(2)\right)\sigma\right)^3}\right]
\qquad r < r_c
$$
\end{document}