theorem welfareDistanceFn_nonneg {z : ℝ} (hz : 0 < z) : 0 ≤ welfareDistanceFn z := by simp only [welfareDistanceFn] linarith [Real.add_one_le_exp (Real.log z), Real.exp_log hz]
thesis/CESProofs/Hierarchy/Defs.lean:135
Core definitions for the Lean formalization of Paper 4: