Localized Equation Laplacian #
Part of the Caffarelli–Kohn–Nirenberg partial regularity proof.
theorem
CKN.Core.Step3.laplacian_transfer_of_sws
{Ω : Set Foundation.Parabolic.Vec3}
{I : Set ℝ}
{q : ℝ}
{u : Foundation.Parabolic.ParabolicPoint → Foundation.Parabolic.Vec3}
{Du : Foundation.Parabolic.ParabolicPoint → Fin 3 → Foundation.Parabolic.Vec3}
{p : Foundation.Parabolic.ParabolicPoint → ℝ}
{f : Foundation.Parabolic.ParabolicPoint → Foundation.Parabolic.Vec3}
(hsol : IsSuitableWeakSolutionIntegrable Ω I q u Du p f)
{φ : Foundation.Parabolic.Vec3 × ℝ → ℝ}
(hφ : φ ∈ spaceTimeTestFunction Ω I)
{Ω' : Set Foundation.Parabolic.Vec3}
{J : Set ℝ}
(hbox : localBox Ω I Ω' J)
(hφbox : tsupport φ ⊆ Ω' ×ˢ J)
{ψ : Foundation.Parabolic.Vec3 × ℝ → Foundation.Parabolic.Vec3}
(hψ : ψ ∈ spaceTimeTestFunction Set.univ Set.univ)
:
∫ (z : Foundation.Parabolic.Vec3 × ℝ), ∑ i : Fin 3,
φ z * u z i * ∑ j : Fin 3, spatialSecondPartial (fun (w : Foundation.Parabolic.ParabolicPoint) => ψ w i) j j z = -∫ (z : Foundation.Parabolic.Vec3 × ℝ), ∑ i : Fin 3,
∑ j : Fin 3,
(φ z * Du z i j + u z i * spatialPartial φ j z) * spatialPartial (fun (w : Foundation.Parabolic.ParabolicPoint) => ψ w i) j z