proposition: Lemma inj_switch_path_node : injective switch_path_node.
proof: Proof. by move=> [[]x1 x2] [[]y1 y2] //= [] -> ->. Qed.
imports: mathcomp(all_ssreflect ssralg fingroup zmodp poly ssrnum) mathcomp(matrix perm) ssr_ext ssralg_ext fdist subgraph_partition tanner