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def definition def or abbrev

HasInteraction

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formal statement (Lean)

  48def HasInteraction (F : ℝ → ℝ) : Prop :=

proof body

Definition body.

  49  ∃ x y : ℝ, 0 < x ∧ 0 < y ∧
  50    F (x * y) + F (x / y) ≠ 2 * F x + 2 * F y
  51
  52/-! ## The quadratic-log branch fails the gate -/
  53

used by (17)

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