proposition: Lemma fdistC13_fst : fdistC13`1 = fdistX ((fdistA P)`2).
proof: Proof. by rewrite /fdistC13 /fdist_fst /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