proposition: Lemma uniq_map_iff : uniq (map f E) <-> uniq E.
proof: Proof. clear. intuition auto using uniq_map_1, uniq_map_2. Qed.
imports: Coq.FSets.FSets Coq.Lists.List Coq.Logic.Decidable Coq.Strings.String String Metalib.CoqFSetDecide Metalib.CoqListFacts Metalib.LibTactics Metalib.CoqFSetInterface Coq.Classes.Equivalence Coq.Classes.EquivDec Metalib.CoqEqDec