proposition: Lemma merge_isoE (x: F): merge_iso (\pi x) = \pi h x.
proof: Proof. apply h_mergeE. Qed.
imports: Coq(Morphisms RelationClasses) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient preliminaries bij) GraphTheory(equiv digraph setoid_bigop structures)