def excessSavingCoeff (J : ℕ) (ρ : ℝ) : ℝ := (↑J - 1) ^ 2 / (2 * ↑J ^ 3 * curvatureK J ρ)
thesis/CESProofs/Foundations/FurtherProperties.lean:143
Further properties of CES curvature (Paper 1, Section 9):