proposition: Lemma aux15: forall e, PE1_root e -> PV0 (src g e) -> False.
proof: Proof. intros. apply aux04 in H. symmetry in H. generalize (src g e) H H0. rewrite <- Disjoint_spec. apply aux08. Qed.
imports: CertiGraph.lib.Coqlib CertiGraph.lib.Ensembles_ext CertiGraph.lib.EquivDec_ext CertiGraph.lib.relation_list CertiGraph.lib.Morphisms_ext CertiGraph.lib.List_ext CertiGraph.graph.graph_model CertiGraph.graph.path_lemmas CertiGraph.graph.graph_gen CertiGraph.graph.graph_relation CertiGraph.graph.subgraph2 CertiGraph.graph.graph_morphism