fact: Definition adj_edge (g: PGraph) (e: E) (u v: V) := strong_evalid g e /\ ((src g e = u /\ dst g e = v) \/ (src g e = v /\ dst g e = u)).
imports: Coq.Logic.Classical CertiGraph.lib.List_ext CertiGraph.lib.EquivDec_ext CertiGraph.graph.graph_model CertiGraph.graph.graph_relation CertiGraph.graph.path_lemmas CertiGraph.graph.graph_gen CertiGraph.graph.FiniteGraph