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def definition def or abbrev

velocityGradientMag

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formal statement (Lean)

  86def velocityGradientMag {siteCount : ℕ} (Λ : LatticeTopology siteCount) (h : ℝ)
  87    (u : VectorField siteCount) (x : Fin siteCount) : ℝ :=

proof body

Definition body.

  88  Finset.sup' (Finset.univ ×ˢ Finset.univ)
  89    (by exact Finset.Nonempty.product Finset.univ_nonempty Finset.univ_nonempty)
  90    (fun p => |forwardDiff Λ h (fun y => u y p.1) p.2 x|)
  91
  92/-! ## Core NS Operator (physical data only) -/
  93
  94/-- Physical data of a discrete incompressible lattice Navier--Stokes flow.
  95No pair-budget or absorption fields—those are derived below. -/

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