proposition: Lemma oiso2_idE G (isG : is_graph G) x : x \in vset G -> oiso2_id isG x = x.
proof: Proof. move => Vx. by rewrite /= vfun_bodyE. Qed.
imports: Coq(Relation_Definitions Morphisms RelationClasses) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient preliminaries bij equiv) GraphTheory(setoid_bigop structures pttdom mgraph mgraph2) GraphTheory(rewriting open_confluence finmap_plus)