proposition: Lemma hullU_strl X Y : hull (hull X `|` Y) = hull (X `|` Y).
proof: Proof. by rewrite [in LHS]setUC [in RHS]setUC hullU_strr. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg fingroup perm matrix) mathcomp(mathcomp_extra boolp classical_sets Rstruct) mathcomp(ssrnum ereal) mathcomp(lra Rstruct reals) Reals ssrR Reals_ext Ranalysis_ext ssr_ext ssralg_ext logb realType_ext fdist