theorem superadditivity_with_friction (hJ : 2 ≤ J) {ρ : ℝ} (hρ : ρ < 1)
{T Tstar : ℝ} (hT : 0 ≤ T) (hTs : 0 < Tstar) :
effectiveCurvatureKeff J ρ T Tstar ≤ curvatureK J ρ :=
effectiveCurvatureKeff_le_K hJ hρ hT hTsTheorem 4 and Propositions 5-7, Corollary 1: