lammps/doc/Eqs/fix_lb_fluid_boltzmann.tex

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\documentclass[12pt]{article}
\begin{document}
$$
\left(\partial_t + e_{i\alpha}\partial_{\alpha}\right)f_i = -\frac{1}{\tau}\left(f_i - f_i^{eq}\right) + W_i
$$
\end{document}