proposition: Lemma disjoint_map_2 : forall A B C (E : list (X.t*A)) (F : list (X.t*B)) (f:A->C), disjoint E F -> disjoint (map f E) F.
proof: Proof. unfold disjoint. intros. rewrite dom_map in *. fsetdec. 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