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def definition def or abbrev

partialDeriv_v2

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formal statement (Lean)

  34noncomputable def partialDeriv_v2 (f : (Fin 4 → ℝ) → ℝ) (μ : Fin 4)
  35    (x : Fin 4 → ℝ) : ℝ :=

proof body

Definition body.

  36  deriv (fun t => f (coordRay x μ t)) 0
  37
  38/-- The derivative of a constant function is zero. -/

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