fact: Definition node_pred_equiv (m1 m2: NodePred Vertex) := forall n, m1 n <-> m2 n.
imports: Coq.Logic.ProofIrrelevance CertiGraph.lib.Ensembles_ext CertiGraph.lib.EquivDec_ext CertiGraph.lib.List_ext CertiGraph.lib.relation_list CertiGraph.lib.Equivalence_ext