theorem steadyState_KY_eq {s δ Y K : ℝ} (hδ : 0 < δ) (hY : 0 < Y)
(hss : capitalAccumulation s δ Y K = 0) :
K / Y = steadyStateKY s δ := by
simp only [steadyStateKY]
have h := capitalAccumulation_eq_zero_iff.mp hss
-- s * Y = δ * K → K/Y = s/δ
have hY_ne := ne_of_gt hY
have hδ_ne := ne_of_gt hδ
rw [div_eq_div_iff hY_ne hδ_ne]
linarithAccumulation Dynamics (Layer 2 of Macro Extension)