proposition: Lemma hullUA X Y Z : hull (X `|` hull (Y `|` Z)) = hull (hull (X `|` Y) `|` Z).
proof: Proof. by rewrite hullU_strr hullU_strl setUA. 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