Equation Icon  { [ ] [ ]} 1 1 2 4 1 1 2 3 0 = @t V + c2- 2-^Wkk + 2V + c4- X^ + 2-^Zkk + 2V W^kk + 3V { 2 [ ] 4 [ 1 1 ]} + @i Vi + -2 R^i + V Vi + -4 ^Yi- -W^ijVj + -W^kkVi + V ^Ri + V 2Vi c c 2 2 ( ) + O 1- , (120) c6 { } { [ ]} 2-[^ ] ^ 1-^ 4- ^ 1^ 0 = @t Vi + c2 Ri + V Vi + @j Wij - 2 Wkkdij + c2 Zij- 2Zkkdij ( 1 ) + O -4 . c