proposition: Lemma fdistA_AC_snd : (fdistA (fdistAC P))`2 = fdistX ((fdistA P)`2).
proof: Proof. by rewrite /fdist_snd /fdistX !fdistmap_comp. 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