Equation Icon  n ∑ j -∂-- n ut(t,x) = A (t,x,u)∂xj u(t,x) + F(t,x,u ) + δF (t,x), x ∈ ℝ , 0 ≤ t ≤ T, (3.116 ) j=1 u(0,x ) = f (x) + δf(x), x ∈ ℝn, (3.117 )