Hostname: page-component-848d4c4894-m9kch Total loading time: 0 Render date: 2024-05-14T07:10:37.327Z Has data issue: false hasContentIssue false

Basic sequences in F-spaces and their applications

Published online by Cambridge University Press:  20 January 2009

N. J. Kalton
Affiliation:
University College, Singleton Park, Swansea SA2 8PP
Rights & Permissions [Opens in a new window]

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The aim of this paper is to establish a conjecture of Shapiro (10) that an F-space (complete metric linear space) with the Hahn-Banach Extension Property is locally convex. This result was proved by Shapiro for F-spaces with Schauder bases; other similar results have been obtained by Ribe (8). The method used in this paper is to establish the existence of basic sequences in most F-spaces.

Type
Research Article
Copyright
Copyright © Edinburgh Mathematical Society 1974

References

REFERENCES

(1) Bessaga, C. and Pelczynski, A., Wlansosci baz w przestrzeniach typu B0, Brace Mat. 3 (1959), 123142.Google Scholar
(2) Bessaga, C. and Pelczynski, A., On bases and unconditional convergence of series in Banach spaces, Stadia Math. 17 (1958), 151164.CrossRefGoogle Scholar
(3) Day, M. M., On the basis problem in normed linear spaces, Proc. Amer. Math. Soc. 13 (1962), 655658.CrossRefGoogle Scholar
(4) Gelbaum, B., Notes on Banach spaces with bases, An. Acad. Brasil. Ci. 30 (1958), 2936.Google Scholar
(5) Kelley, J. L., General topology (New York, 1955).Google Scholar
(6) Pelczynski, A., A note on the paper of I. Singer, “Basic sequences and reflexi-vity of Banach spaces”, Studia Math. 21 (1962), 371374.CrossRefGoogle Scholar
(7) Pelczynski, A., A proof of the Eberlein-Smulian Theorem by an application of basic sequences, Bull. Acad. Polon. Sci. Sir. Math. Astronom. Phys. 12 (1964), 543548.Google Scholar
(8) Ribe, M., Necessary convexity conditions for the Hahn-Banach theorem in metrizable spaces, Pacific J. Math. 44 (1973), 715732.CrossRefGoogle Scholar
(9) Robertson, A. P. and Robertson, W., Topological vector spaces (Cambridge, 1964).Google Scholar
(10) Shapiro, J. H., Extension of linear functionals on F-spaces with bases, Duke Math. J. 37 (1970), 639645.CrossRefGoogle Scholar
(11) Shapiro, J. H., On convexity and compactness in F-spaces with bases, Indiana Univ. Math. J. 21 (1972), 10731090.CrossRefGoogle Scholar
(12) Shapiro, J. H., On the weak basis theorem in F-spaces (to appear).Google Scholar
(13) Weill, L. J., Stability of bases in complete barrelled space, Proc. Amer. Math. Soc. 18 (1967), 10451050.CrossRefGoogle Scholar
(14) Duren, P. L., Romburg, B. W. and Sheidls, A. L., Linear functionals on Hp-spaces with 0 < p < 1, J. Reine Angew. Math. 238 (1969), 3260.Google Scholar