proposition: Lemma pack_v_IO (F : pre_graph) (isF : is_graph F) z (Hz : z \notin pIO F) : z \in vset F -> @pack_v _ _ F isF z \notin IO.
proof: Proof. move => Vz. apply: contraNN Hz. by rewrite pack_vE !inE. 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)