2009-01-08 07:54:46 +08:00
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\documentclass[12pt]{article}
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\begin{document}
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$$
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F_{hz} = \sqrt{\delta} \sqrt{\frac{R_i R_j}{R_i + R_j}} F_{hk} =
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\sqrt{\delta} \sqrt{\frac{R_i R_j}{R_i + R_j}}
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\Big[ (k_n \delta \mathbf{n}_{ij} -
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m_{\mbox{\scriptsize{eff}}} \: \gamma_n \mathbf{ v}_n) -
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2009-01-09 07:18:29 +08:00
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(k_t \mathbf{ \Delta s}_t +
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2009-01-08 07:54:46 +08:00
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m_{\mbox{\scriptsize{eff}}} \: \gamma_t \mathbf{v}_t) \Big]
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$$
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\end{document}
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