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def definition def or abbrev

runningMass

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formal statement (Lean)

 237def runningMass (γ : AnomalousDimension) (f : Fermion) (m_μ₀ : ℝ) (lnμ₀ lnμ : ℝ) : ℝ :=

proof body

Definition body.

 238  m_μ₀ * Real.exp (-(∫ t in Set.Icc lnμ₀ lnμ, γ.gamma f (Real.exp t)))
 239
 240/-- The mass ratio between two scales.
 241
 242    `m(μ₁)/m(μ₀) = exp(-∫_{ln μ₀}^{ln μ₁} γ d(ln μ))` -/

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