proposition: Lemma asimpl_f_bin b f1 f2 s : (bin b f1 f2)[s] = bin b (f1[s]) (f2[s]).
proof: Proof. easy. Qed.
imports: Undecidability.FOL.Syntax(Core Facts) Coq.Classes.Init Relation_Definitions Coq.Classes.RelationClasses Coq.Classes.Morphisms Setoid