proposition: Lemma uniq_map_app_l : forall (f1 : A -> A)(f2: B -> B), uniq (F ++ E) -> uniq (map f1 f2 F ++ E).
proof: Proof. clear. intros. solve_uniq. Qed.
imports: Coq.FSets.FSets Coq.Lists.List Coq.Logic.Decidable Metalib.CoqFSetDecide Metalib.CoqListFacts Metalib.LibTactics Metalib.MetatheoryAtom Metalib.LibTactics