fact: Record iso2 (F G: graph2): Type@{S2} := Iso2 { iso2_iso:> F ≃ G; iso2_input: iso2_iso input = input; iso2_output: iso2_iso output = output }.
imports: HB(structures) Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient preliminaries bij equiv) GraphTheory(setoid_bigop structures pttdom mgraph ptt)