Is Distributional Drift Diffusion

Supporting results for the Constantin–Ignatova–Vicol axisymmetric regularity theorem.

def CIV.IsDistributionalDriftDiffusion (m d : ℕ) (I : Set ℝ) (B : CKN.Vec m × ℝ → CKN.Vec m) (divB q : CKN.Vec m × ℝ → ℝ) : Prop

∂_τ q + B·∇q = Δ_X q on Vec m × I in the sense of distributions, with B·∇q = div(Bq) - (div B) q (footnote to eq:aniso:comparison:equation), the divergence div B of the drift being carried as data (design note N5).

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