proposition: Lemma elabel_iso F G (h: iso F G) e: elabel (h.e e) ≡[h.d e] elabel e.
proof: Proof. exact: elabel_ihom. Qed.
imports: Coq(Morphisms RelationClasses) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient preliminaries bij) GraphTheory(equiv digraph setoid_bigop structures)