proposition: Lemma inj_vNfresh (x : G) : inj_v x != fresh (vset open).
proof: Proof. apply: inj_v_fresh. exact: freshP. 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)