fact: Definition hzlehchoice ( n m : hz ) ( l : hzleh n m ) : ( hzlth n m ) ⨿ ( n = m ) .
imports: UniMath.Foundations.NaturalNumbers UniMath.MoreFoundations.PartA UniMath.MoreFoundations.NegativePropositions UniMath.Algebra.Monoids UniMath.Algebra.Groups UniMath.Algebra.RigsAndRings UniMath.NumberSystems.NaturalNumbersAlgebra