Equation Icon   @~rb @ i a ----+ ---i(~rbvb) + 3-r~b = 0, (68) j @t @x a @(~rbvb)- -@-- i j a- j -1-@p~- ~rb-@P~- @t + @xi (~rbvbvb) + 5a ~rbvb + a2 @xj + a2 @xj = 0, (69) @~e @ @vi a ---+ --i(~evib) + ~p---bi + 3-(~e + ~p) = S~cool, (70) @t @x @x a