Aragón Artacho, Francisco Javier A new and self-contained proof of Borwein's norm duality theorem ARAGÓN ARTACHO, Francisco Javier. "A new and self-contained proof of Borwein's norm duality theorem". Set-Valued Analysis. Vol. 15, No. 3 (Sept. 2007). ISSN 0927-6947, pp. 307-315 URI: http://hdl.handle.net/10045/8059 DOI: 10.1007/s11228-006-0040-6 ISSN: 0927-6947 (Print) Abstract: Borwein’s norm duality theorem establishes the equality between the outer (inner) norm of a sublinear mapping and the inner (outer) norm of its adjoint mappings. In this note we provide an extended version of this theorem with a new and self-contained proof relying only on the Hahn-Banach theorem. We also give examples showing that the assumptions of the theorem cannot be relaxed. Keywords:Convex process, Sublinear mapping, Norm duality, Inner norm, Outer norm Springer Netherlands info:eu-repo/semantics/article