lammps/doc/Eqs/fix_lb_fluid_viscosity.tex

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\documentclass[12pt]{article}
\begin{document}
$$
\eta_{\alpha \beta \gamma \nu} = \eta\left[\delta_{\alpha \gamma}\delta_{\beta \nu} + \delta_{\alpha \nu}\delta_{\beta \gamma} - \frac{2}{3}\delta_{\alpha \beta}\delta_{\gamma \nu}\right] + \Lambda \delta_{\alpha \beta}\delta_{\gamma \nu}
$$
\end{document}