Equation Icon  1 ( )( 1 ′ 1 ′ ′) ΦRα′(x′) = − ---(1 − 6 ξ)qRu α′ + q gα′β′ + uα′uβ′-a˙β + -R βγ′u γ + Φtαa′il, (17.42 ) 12 3 6