proposition: Lemma fdistC13_snd : fdistC13`2 = (P`1)`1.
proof: Proof. by rewrite /fdistC13 fdistC12_snd fdistAX2. 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