1 \documentclass[12pt
]{article
}
6 F_
{hz
} =
\sqrt{\delta} \sqrt{\frac{R_i R_j
}{R_i + R_j
}} F_
{hk
} =
7 \sqrt{\delta} \sqrt{\frac{R_i R_j
}{R_i + R_j
}}
8 \Big[ (k_n
\delta \mathbf{n
}_
{ij
} -
9 m_
{\mbox{\scriptsize{eff
}}} \:
\gamma_n \mathbf{ v
}_n) -
10 (k_t
\mathbf{ \Delta s
}_t +
11 m_
{\mbox{\scriptsize{eff
}}} \:
\gamma_t \mathbf{v
}_t)
\Big]