Order Cancellation Law in a Semigroup of Closed Convex Sets

In this paper we generalize Robinson's version of an order cancellation law in which some unbounded subsets a vector space are cancellative elements. We introduce the notion weakly narrow sets normed spaces, study their properties and prove where canceled set is narrow. Also, for closed convex topological has bounded Hausdorff-like distance from its recession cone. topologically embed semigroup sharing cone having it into space. This result extends Bielawski Tabor's generalization Rådström theorem.