Equation Icon  [ ] β′ γ′ β′ α′ 1- b 1- ( b) 2 Uαβ′;γ′u u + U αβ′a = g α aα′ + 2rR α′0b0Ω − 6r R00 + R0bΩ u α′ + 𝒪 (r ) (449 )