proposition: Lemma oiso2_lv (F G : pre_graph) (i : F ⩭2 G) x : x \in vset F -> lv G (i x) ≡ lv F x.
proof: Proof. case: i => isF isG i Ee /=. rewrite vfun_bodyE /=. exact: (vlabel_iso i). 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)