proposition: Lemma nattohz_inj {m n} : nattohz m = nattohz n -> m = n.
proof: Proof. revert m n; exact (invmaponpathsincl _ isinclnattohz). Defined.
imports: UniMath.Foundations.NaturalNumbers UniMath.MoreFoundations.PartA UniMath.MoreFoundations.NegativePropositions UniMath.Algebra.Monoids UniMath.Algebra.Groups UniMath.Algebra.RigsAndRings UniMath.NumberSystems.NaturalNumbersAlgebra