fact: Definition isrigfuntoringdiff (X : rig) : @isrigfun X (rigtoring X) (toringdiff X) := make_dirprod (isaddmonoidfuntoringdiff X) (ismultmonoidfuntoringdiff X).
imports: UniMath.Algebra.Groups UniMath.MoreFoundations.Sets UniMath.MoreFoundations.Orders UniMath.Algebra.Monoids