def definition def or abbrev

`growth_prefactor`

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formal statement (Lean)

  12noncomputable def growth_prefactor (alpha C : ℝ) : ℝ :=

Definition body.

  13  (3 * C) / (2 * alpha^2 + 5 * alpha)
  14
  15/-- The closed-form ILG growth factor D(a, k) in EdS background (first-order in C). -/

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