proposition: Lemma cnv2par (F G: graph2): (F ∥ G)° ≃2 F° ∥ G°.
proof: Proof. apply merge_same. apply eqv_clot_eq; leqv. eqv. eqv. Qed.
imports: HB(structures) Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient preliminaries bij equiv) GraphTheory(setoid_bigop structures pttdom mgraph ptt)