Equation Icon  α′ γ′ β′δ′ Ra0b0(u ) = R α′γ′β′δ′ea u eb u′ , Ra0bd(u ) = R α′γ′β′δ′eαa′uγ′eβb eδd′, α′ γ′β′ δ′ Racbd(u ) = R α′γ′β′δ′ea ec eb ed (10.22 )