fact: Definition flip_edge (G : pre_graph) (e : ET) := {| vset := vset G; eset := eset G; endpt b := (endpt G b)[upd e := endpt G (~~ b) e]; lv := lv G; le := (le G)[upd e := (le G e)°]; p_in := p_in G; p_out := p_out G |}.
imports: HB(structures) Coq(Relation_Definitions Morphisms RelationClasses) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient preliminaries bij equiv) GraphTheory(setoid_bigop structures pttdom rewriting) GraphTheory(finmap_plus)