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