proposition: Lemma relabel2_var a: relabel2 (g2_var _ a) ≃2 g2_var _ (fe a).
proof: Proof. transitivity (edge_graph2 (fv 1%CM) (fe a) (fv 1%CM)). Iso2 (relabel_edge _ _ _). apply edge_graph2_iso=>//. Qed.
imports: HB(structures) Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient preliminaries bij equiv) GraphTheory(setoid_bigop structures pttdom mgraph ptt)