fact: Definition isincltoringdiff (X : rig) (iscanc : ∏ x : X, @isrcancelable X (@op1 X) x) : isincl (toringdiff X) := isincltoabgrdiff (rigaddabmonoid X) iscanc.
imports: UniMath.Algebra.Groups UniMath.MoreFoundations.Sets UniMath.MoreFoundations.Orders UniMath.Algebra.Monoids