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def definition def or abbrev

arithmeticMean

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formal statement (Lean)

 157noncomputable def arithmeticMean (n₁ n₂ : ℝ) : ℝ := (n₁ + n₂) / 2

proof body

Definition body.

 158
 159/-- **F1.4.3**: For distinct positive reals, the geometric mean differs
 160    from the arithmetic mean (AM-GM strict inequality). -/

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