proposition: Lemma hzrminusplus' (n m : hz) : n = n - m + m.
proof: Proof. apply pathsinv0. apply hzrminusplus. Defined.
imports: UniMath.Foundations.NaturalNumbers UniMath.MoreFoundations.PartA UniMath.MoreFoundations.NegativePropositions UniMath.Algebra.Monoids UniMath.Algebra.Groups UniMath.Algebra.RigsAndRings UniMath.NumberSystems.NaturalNumbersAlgebra