fact: Definition remove_vertex (G : pre_graph) (x : VT) := {| vset := vset G `\ x; eset := eset G `\` edges_at G x; endpt := endpt G; lv := lv G; le := le G; 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)