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def definition def or abbrev

laplacian

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formal statement (Lean)

  54noncomputable def laplacian (f : (Fin 4 → ℝ) → ℝ) (x : Fin 4 → ℝ) : ℝ :=

proof body

Definition body.

  55  secondDeriv f ⟨1, by decide⟩ ⟨1, by decide⟩ x +
  56  secondDeriv f ⟨2, by decide⟩ ⟨2, by decide⟩ x +
  57  secondDeriv f ⟨3, by decide⟩ ⟨3, by decide⟩ x
  58
  59/-- Linearity of the directional derivative. -/

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