fact: Definition bgraph (G : graph) (U : {set G}) (x:G) := @point (induced (@bag G U x)) (Sub x (@bag_id G U x)) (Sub x (@bag_id G U x)).
imports: Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient bij preliminaries) GraphTheory(digraph sgraph treewidth minor checkpoint) GraphTheory(setoid_bigop structures mgraph mgraph2)