fact: Definition marked_reachable (g1 : Graph) (x : V) (g2 : Graph) : Prop := (forall y, marked g2 y <-> marked g1 y \/ g1 |= x ~o~> y satisfying (unmarked g1)).
imports: Coq.Classes.Morphisms CertiGraph.lib.Coqlib CertiGraph.lib.EquivDec_ext CertiGraph.lib.EnumEnsembles CertiGraph.lib.List_ext CertiGraph.lib.relation_list CertiGraph.graph.graph_model CertiGraph.graph.path_lemmas CertiGraph.graph.graph_gen CertiGraph.graph.graph_relation CertiGraph.graph.subgraph2 CertiGraph.graph.reachable_ind Coq.Logic.Classical