theorem pigouvian_subsidy_pos {J ρ : ℝ} (hJ : 0 < J) (hρ : ρ < 1) : 0 < marginalK J ρ := by simp only [marginalK] exact div_pos (by linarith) (sq_pos_of_pos hJ)
thesis/CESProofs/EntryExit/Defs.lean:153
Core definitions for the Lean formalization of Paper 1c: