proposition: Lemma oiso2_transE F G H i j k : k \in vset F -> @oiso2_trans F G H i j k = j (i k).
proof: Proof. case: i j => isF isG i [isF' isH j] Vk. rewrite /= !vfun_bodyE; first exact: valP. move => p /=. by rewrite fsvalK. 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)