fact: Definition ismultmonoidfuntoringdiff (X : rig) : @ismonoidfun (rigmultmonoid X) (ringmultmonoid (rigtoring X)) (toringdiff X) := make_dirprod (isbinop2funtoringdiff X) (isunital2funtoringdiff X).
imports: UniMath.Algebra.Groups UniMath.MoreFoundations.Sets UniMath.MoreFoundations.Orders UniMath.Algebra.Monoids