proposition: Lemma fdist_ext d d' : (forall x, d x = d' x) -> d = d'.
proof: Proof. by move=> ?; exact/val_inj/ffunP. 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