proposition: Lemma ringminusdistr { X : commring } ( a b c : X ) : a * (b - c) = a * b - a * c.
proof: Proof. intros. rewrite ringldistr. rewrite ringrmultminus. apply idpath. Defined.
imports: UniMath.Tactics.EnsureStructuredProofs UniMath.Foundations.PartA UniMath.Foundations.Propositions UniMath.Foundations.NaturalNumbers UniMath.Algebra.RigsAndRings UniMath.Algebra.Domains_and_Fields UniMath.NumberSystems.Integers UniMath.Algebra.Monoids