proposition: Lemma fdistACE x : fdistAC x = P (x.1.1, x.2, x.1.2).
proof: Proof. by case: x => x1 x2; rewrite /fdistAC fdistXE fdistAE fdistC12E. 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