proposition: Lemma fdistAC2 : (fdistAC P)`2 = (P`1)`2.
proof: Proof. by rewrite /fdistAC fdistX2 fdistA_C12_fst. 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