Equation Icon   @rb 1 @ ----+ ----i(rb~vib) = 0, (75) j @t a@x @(rb~vb)- 1--@-- i j a- j rb-@-~P- @t + a @xi(rb~vb ~vb + pdij) + arb~vb + a @xj = 0, (76) @E 1 @ 2a r ~vi@ ~P ----+ -----(E~vib + p~vib) + ---E + -b-b----= Scool, (77) @t a@xi a a @xi