proposition: Lemma islunit_CCDRzero_CCDRplus : ∏ x : X, 0 + x = x.
proof: Proof. now apply riglunax1. Qed.
imports: UniMath.Algebra.DivisionRig UniMath.Algebra.Domains_and_Fields UniMath.Algebra.Apartness UniMath.MoreFoundations.Tactics