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def definition def or abbrev

phiRung

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formal statement (Lean)

 217noncomputable def phiRung (M M₀ : ℝ) : ℝ :=

proof body

Definition body.

 218  Real.log (M / M₀) / Real.log phi
 219
 220/-- The φ-rung recovers the mass: M₀ · φ^(phiRung M M₀) = M. -/

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