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def definition def or abbrev

dAlembertDefect

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formal statement (Lean)

  57def dAlembertDefect (H : ℝ → ℝ) (t u : ℝ) : ℝ :=

proof body

Definition body.

  58  H (t + u) + H (t - u) - 2 * H t * H u
  59
  60/-- The defect is zero iff H satisfies the d'Alembert equation at (t, u). -/

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