proposition: Lemma classes_eq_related@{} : forall q r, ' q = ' r -> equiv q r.
proof: Proof. apply classes_eq_related@{UR UR Ularge UR Ularge};apply _. Qed.
imports: HoTT.HIT.quotient HoTT.Basics.Trunc HoTT.Classes.interfaces.abstract_algebra HoTT.Classes.theory.dec_fields