proposition: Lemma cnv1: 1° ≡ @one X.
proof: Proof. rewrite -[1°]dotx1 -{2}[1]cnvI. by rewrite -cnvdot dotx1 cnvI. Qed.
imports: HB(structures) Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone preliminaries setoid_bigop structures)