Equation Icon  ∑ [ ∑ ]2 ∑ 2 g = 1 − -2 μj-+ 2β- -μj − 1-+-2γ- μjr˙j- 00 c2 rij c4 rij c4 rij j⁄=i j⁄=i j⁄=i 2(2β-−--1)∑ μj-∑ μk- 1- ∑ ∂2rij- −5 + c4 rij rjk − c4 μj ∂t2 + 𝒪 (c ), j⁄=i k⁄=j j⁄=i