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def definition def or abbrev

CoshAddIdentity

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formal statement (Lean)

  29def CoshAddIdentity (F : ℝ → ℝ) : Prop :=

proof body

Definition body.

  30  ∀ t u : ℝ,
  31    G F (t+u) + G F (t-u) = 2 * (G F t * G F u) + 2 * (G F t + G F u)
  32
  33/-- Direct cosh-add identity on a function. -/

used by (15)

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