proposition: Lemma issymm_CCDRap : ∏ x y : X, x ≠ y -> y ≠ x.
proof: Proof. exact (issymm_CDRap (X := ConstructiveCommutativeDivisionRig_ConstructiveDivisionRig X)). Qed.
imports: UniMath.Algebra.DivisionRig UniMath.Algebra.Domains_and_Fields UniMath.Algebra.Apartness UniMath.MoreFoundations.Tactics