proposition: Lemma endpt_proof b (e : eset G) : endpt G b (val e) \in vset G.
proof: Proof. exact: (endptP b (valP e)). 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)