Gilsdorf, Thomas E. Bounded sets in \({\mathcal L}(E,F)\). (English) Zbl 0684.46006 Int. J. Math. Math. Sci. 12, No. 3, 447-450 (1989). Let E and F denote Hausdorff locally convex spaces, let B be an absolutely convex subset of E. If the space \(E_ B=\cup \{nB:\) \(n\geq 1\}\) is a barreled normed space, then B is called a barreled disk; E is locally barreled if each bounded set in E is contained in a closed, bounded barreled disk. The main result of this paper is the following characterization of locally barreled spaces in terms of the topologies of the space \({\mathcal L}(E,F)\) of continuous linear maps from E to F: Suppose that for each absolutely convex, closed, bounded set \(A\subset E\) there exists a barrel \(D\subset E\) such that \(A=D\cap E_ A\). Then the following are equivalent:(a) The families of bounded subsets of \({\mathcal L}(E,F)\) are identical for all \({\mathcal S}\)-topologies on \({\mathcal L}(E,F)\), where \({\mathcal S}\) is a family of bounded subsets of E which covers E. (b) E is locally barreled. Reviewer: F.Haslinger MSC: 46A32 Spaces of linear operators; topological tensor products; approximation properties 46A03 General theory of locally convex spaces 46A08 Barrelled spaces, bornological spaces Keywords:barreled normed space; barreled disk; locally barreled spaces PDFBibTeX XMLCite \textit{T. E. Gilsdorf}, Int. J. Math. Math. Sci. 12, No. 3, 447--450 (1989; Zbl 0684.46006) Full Text: DOI EuDML