proposition: Lemma fdist_proj13_snd : fdist_proj13`2 = P`2.
proof: Proof. by rewrite /fdist_proj13 fdistA22 fdistC12_snd. 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