Equation Icon  ˙pα(u) = gα uα′uβ′ + gα aα′ [ α′;β′ α′ ] a 1- a b 2 α = a + 2rR 0b0Ω + O (r ) ea, ¨pα(u) = gα uα′uβ′u γ′ + gα (2a α′u β′ + uα′aβ′) + gα ˙aα′ [ α′;β′γ′ ] [ α′;β′ ] α′ = − ˙a0 + O (r) eα + ˙aa + O (r) eα, 0 a