Equation Icon  [ ] [ ( ) ] Q 𝒮r = Q2 [∂g ]r2 + Q3 ∂2g,(∂g)2 r3 + Q4 ∂3g, ∂2g (∂g ),(∂g)3 r4 + [ ( ) ( )2 ( ) 2 4] +Q5 ∂4g, ∂3g (∂g), ∂2g , ∂2g (∂g) ,(∂g ) r5 + ...,