Equation Icon  ∑n ∂2v (2) ∑n ∂v(2) v(2tt)(t,x) = Ajk (t0,x0) -------(t,x ) + 2Bj (t0,x0 )--t-(t,x) + F0, (3.89 ) j,k=1 ∂xj∂xk j=1 ∂xj