 Therefore, "conical combinations" and "conical hulls" are in fact "convex conical combinations" and "convex conical hulls" respectively.Moreover, the above remark about dividing the coefficients while discarding the origin implies that the conical combinations and hulls may be considered as convex combinations and convex hulls in the projective space.While the convex hull of a compact set is also a compact set, this is not so for the conical hull; first of all, the latter one is unbounded.