Equation Icon  ( ) ( ) du = e0αdx α − Ωa ebαdxα , (10.27 ) [ 1 ]( ) dˆxa = − raa + --r2Sa + O (r3) e0αdx α [ 2( ) ] + δa + raa + 1r2Sa Ω + 1-r2Sa + O (r3) (ebdx α). (10.28 ) b 3 b 6 b α