fact: Definition add_edge2 (G: graph2) (x y: G) u := point (add_edge G x y u) input output.
imports: HB(structures) Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient preliminaries bij equiv) GraphTheory(setoid_bigop structures pttdom mgraph ptt)