Equation Icon  ^ -1[ ^ 2 3- 2 ] X = [] ret - 4pGV sii + Wij@ijV + 2Vi@t@iV + V @tV + 2(@tV ) - 2@iVj@jVi , -1[ 3 ] ^Ri = [] ret - 4pG(V si- Vis)- 2@kV @iVk- -@tV @iV , (114) 2 -1[ ] ^Wij = [] ret - 4pG(sij - dijskk) - @iV@jV .