proposition: Lemma fdist_proj13_fst : fdist_proj13`1 = (fdistA P)`1.
proof: Proof. by rewrite /fdist_proj13 fdistA21 fdistC12_fst fdistX2 fdistA1. 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