proposition: Lemma fdistC12_fst : fdistC12`1 = fdistX (P`1).
proof: Proof. by rewrite /fdist_fst /fdistC12 /fdistX 2!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