proposition: Lemma path_glue_nil_r: forall p v, p +++ (v, nil) = p.
proof: Proof. unfold path_glue. simpl. intros. rewrite app_nil_r. destruct p. trivial. Qed.
imports: Coq.Logic.ProofIrrelevance Coq.micromega.Lia CertiGraph.lib.Coqlib CertiGraph.lib.EnumEnsembles CertiGraph.lib.List_ext CertiGraph.lib.EquivDec_ext CertiGraph.graph.graph_model Coq.Lists.List Coq.Lists.ListDec