Equation Icon  d-Ed = ⟨𝒫Qu, u ⟩ + ⟨u,𝒫Qu ⟩ = ⟨Qu, 𝒫u ⟩ + ⟨𝒫u, Qu ⟩ = ⟨Qu, u⟩ + ⟨u, Qu ⟩ dt ≤ 2αEd + boundary terms.