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theorem proved term proof

separatelyAdditive_of_interactionDefect_zero

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formal statement (Lean)

  82theorem separatelyAdditive_of_interactionDefect_zero
  83    {P : ℝ → ℝ → ℝ} (h : ∀ u v : ℝ, interactionDefect P u v = 0) :
  84    SeparatelyAdditive P := by

proof body

Term-mode proof.

  85  refine ⟨fun u => P u 0 - P 0 0, fun v => P 0 v, ?_⟩
  86  intro u v
  87  have h_uv := h u v
  88  unfold interactionDefect at h_uv
  89  linarith
  90
  91/-- **Equivalence: separate additivity is identical vanishing of the
  92interaction defect.** -/

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