proposition: Lemma Equivalence_flip {A R} (H : @Equivalence A R) : Equivalence (flip R).
proof: Proof. split; exact _. Qed.
imports: Coq.Setoids.Setoid Coq.Classes.Morphisms Coq.Classes.RelationClasses Coq.Program.Basics Fiat.Common.Coq__8_4__8_5__Compat