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pair_granular.tex
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			\documentclass[12pt]{article}

			\begin{document}

			$$
			F = f\left(\delta/d\right)\left(k_n \delta \mathbf{n}_{ij} -
			m_{\mbox{\scriptsize{eff}}} \gamma_n\mathbf{ v}_n\right) +
			f\left(\delta/d\right)\left(-k_t \delta\mathbf{ \Delta s}_t -
			m_{\mbox{\scriptsize{eff}}} \gamma_t \mathbf{v}_t\right)
			$$

			\end{document}