proposition: Lemma test5 : forall x y : nat, x + (y * x) = x * (y + 1).
proof: Proof. intros;ring_with_nat. Qed.
imports: HoTT(Classes.interfaces.abstract_algebra Classes.implementations.peano_naturals Classes.orders.sum Classes.tactics.ring_tac Classes.tactics.ring_quote) HoTT.Classes.interfaces.naturals