fact: Definition mark (m1 : NodePred V) (root : V) (m2 : NodePred V) : Prop := (forall n, g |= root ~o~> n satisfying (negateP m1) -> m2 n) /\ (forall n, ~g |= root ~o~> n satisfying (negateP m1) -> (m1 n <-> m2 n)).
imports: Coq.Logic.ProofIrrelevance CertiGraph.lib.Ensembles_ext Coq.Lists.List Coq.Classes.Morphisms CertiGraph.lib.Coqlib CertiGraph.lib.List_ext CertiGraph.lib.EquivDec_ext VST.msl.Coqlib2 CertiGraph.graph.graph_model CertiGraph.graph.path_lemmas CertiGraph.graph.reachable_computable CertiGraph.graph.reachable_ind CertiGraph.graph.graph_gen CertiGraph.graph.graph_relation CertiGraph.graph.subgraph2