proposition: Lemma add_vlabel_iso' F G (h: F ≃ G) x a b (e: a ≡ b): F [tst x <- a] ≃ G [tst h x <- b].
proof: Proof. by eapply add_vlabel_iso''. Defined.
imports: Coq(Morphisms RelationClasses) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient preliminaries bij) GraphTheory(equiv digraph setoid_bigop structures)