proposition: Lemma issymm_CDRap : ∏ x y : X, x ≠ y -> y ≠ x.
proof: Proof. exact (pr1 (pr2 (pr1 (pr2 (pr1 (pr2 X)))))). Qed.
imports: UniMath.Algebra.DivisionRig UniMath.Algebra.Domains_and_Fields UniMath.Algebra.Apartness UniMath.MoreFoundations.Tactics