proposition: Lemma relabel2_one: relabel2 1 ≃2 1.
proof: Proof. transitivity (unit_graph2 Le2 (fv 1%CM)). Iso2 (relabel_unit _). apply unit_graph2_iso, Hfvmon0. Qed.
imports: HB(structures) Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient preliminaries bij equiv) GraphTheory(setoid_bigop structures pttdom mgraph ptt)