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