proposition: Lemma nat_naturals : Naturals@{N N N N N N N i} nat.
proof: Proof. split;try apply _. intros;apply toR_unique, _. Qed.
imports: HoTT.Classes.interfaces.abstract_algebra HoTT.Classes.interfaces.naturals HoTT.Classes.interfaces.orders HoTT.Classes.theory.rings HoTT.Classes.orders.semirings HoTT.Classes.theory.apartness