proposition: Lemma relabel2_top: relabel2 g2_top ≃2 g2_top.
proof: Proof. transitivity (two_graph2 Le2 (fv 1%CM) (fv 1%CM)). Iso2 (relabel_two _ _). apply two_graph2_iso; apply 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)