proposition: Lemma eqvEcnv (X : pttdom) (x y : X) : x ≡' y <-> x ≡ y°.
proof: Proof. done. Qed.
imports: HB(structures) Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient preliminaries bij equiv) GraphTheory(setoid_bigop structures pttdom mgraph mgraph2 rewriting)