proposition: Lemma sp_in_step_edom : sp \in edom c'.
proof: Proof. by rewrite /edom step_edom_ok // !inE eqxx. Qed.
imports: mathcomp(all_ssreflect ssralg fingroup zmodp poly ssrnum) mathcomp(matrix perm) ssr_ext ssralg_ext fdist subgraph_partition tanner