Equation Icon  ∫ ∫ ∫ ∗ ∗ n ∗ n ∗ ⟨v,Lu ⟩H = ⟨L v,u⟩H + v H (t,x)ud x − v H (t,x )ud x + v H (t,x )P0(t,x,s)udS,(5.120 ) Σ0 ΣT 𝒯