proposition: Lemma step_edom_id : step_edom = edom c.
proof: Proof. by rewrite /step_edom /step_nodes Hid. Qed.
imports: mathcomp(all_ssreflect ssralg fingroup zmodp poly ssrnum) mathcomp(matrix perm) ssr_ext ssralg_ext fdist subgraph_partition tanner