proposition: Lemma fdistXI : fdistX (fdistX R) = R.
proof: Proof. by rewrite /fdistX fdistmap_comp swapK fdistmap_id. Qed.
imports: mathcomp(all_ssreflect ssralg fingroup perm matrix) mathcomp(all_algebra vector reals normedtype) mathcomp(mathcomp_extra boolp) mathcomp(Rstruct) ssrR logb realType_ext ssr_ext ssralg_ext bigop_ext