theorem curvatureKReal_nonneg {J ρ : ℝ} (hJ : 1 ≤ J) (hρ : ρ ≤ 1) :
0 ≤ curvatureKReal J ρ := by
simp only [curvatureKReal]
apply div_nonneg
· exact mul_nonneg (by linarith) (by linarith)
· linarithPaper 1c, Section 2: K(J) as the Network Engine