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structure definition def or abbrev

NSParams

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formal statement (Lean)

  21structure NSParams where
  22  /-- Spatial dimension (use 2 first, then lift to 3). -/
  23  d : ℕ := 3

proof body

Definition body.

  24  /-- Kinematic viscosity. -/
  25  ν : ℝ := 1
  26
  27/-- Validity predicate for parameters (keep proofs out of the structure to avoid hidden coercions). -/
  28def NSParams.Valid (p : NSParams) : Prop :=
  29  0 < p.ν ∧ 2 ≤ p.d
  30
  31/-- A discrete time step (Δt > 0). -/

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depends on (11)

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