Hostname: page-component-77c89778f8-cnmwb Total loading time: 0 Render date: 2024-07-18T08:20:48.791Z Has data issue: false hasContentIssue false

A factor theorem for locally convex differentiability spaces

Published online by Cambridge University Press:  17 April 2009

Roger Eyland
Affiliation:
Department of Pure Mathematics, University of Sydney, New South Wales 2006, Australia
Bernice Sharp
Affiliation:
Australian Catholic University, 40 Edward Street North Sydney NSW 2060, Australia
Rights & Permissions [Opens in a new window]

Abstract

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 main result of this paper is that a continuous convex function with domain in a locally convex space factors through a normed space. In a recent paper by Sharp, topological linear spaces are categorised according to the differentiability properties of their continuous convex functions; we show that under suitable conditions the classification is preserved by linear maps. A technique for deducing results for locally convex spaces from Banach space theory is an immediate consequence. Examples are given and Asplund C(S) spaces are characterised.

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 1991

References

[1]Asplund, E., ‘Fréchet Differentiability of Convex Functions’, Acta Math 121 (1968), 3147.CrossRefGoogle Scholar
[2]Borwein, J.M., ‘Continuity and Differentiability Properties of Convex Operators’, Proc. London Math. Soc. 3 (1982), 420444.CrossRefGoogle Scholar
[3]Čoban, M. and Kenderov, P., ‘Generic Gateaux Differentiability of Convex Functional in C(T) and the Topological Properties of T’, in Mathematics and Education in Mathematics, 1986: Proceedings of the Fifteenth Spring Conference of the Union of Bulgarian Mathematicians, pp. 141149, 1986.Google Scholar
[4]Dugundji, J., Topology (Allyn and Bacon, Boston, 1970).Google Scholar
[5]Giles, J.R., Convex Analysis with Application in Differentiation of Convex Functions: Research Notes in Mathematics 58 (Pitman, 1982).Google Scholar
[6]Gillman, L. and Jerison, M., Rings of Continuous Functions (Van Nostrand, Princeton, 1960).CrossRefGoogle Scholar
[7]Kelley, J.L., General Topology: Graduate Texts in Mathematics 27 (Springer-Verlag, Berlin, Heidelberg, New York, 1955).Google Scholar
[8]Kelley, J.L. and Namioka, I., Linear Topological Spaces (Van Nostrand, Princeton, N.J., 1963).CrossRefGoogle Scholar
[9]Larman, D.G. and Phelps, R., ‘Gateaux Differentiabilty of Convex Functions on Banach Spaces’, London Math. Soc (2) 20 (1979), 115127.CrossRefGoogle Scholar
[10]Namioka, and Phelps, R., ‘Banach Spaces which are Asplund Spaces’, Duke Math. J. 42 (1975), 735750.CrossRefGoogle Scholar
[11]Phelps, R., Convex Functions, Monotone Operators and Differentiability: Lecture Notes in Mathematics 1364 (Springer-Verlag, Berlin, Heidelberg, New York, 1989).CrossRefGoogle Scholar
[12]Robertson, A.P. and Robertson, W., Topological Vector Spaces (Cambridge University Press, 1966).Google Scholar
[13]Sharp, B., Ph.D. Thesis (University of Newcastle, Australia, 1989).Google Scholar
[14]Sharp, B., ‘The Differentiability of Convex Functions on Topological Linear Spaces’, Bull. Austral. Math. Soc. 42 (1990), 201213.CrossRefGoogle Scholar
[15]Wilansky, A., Functional Analysis (Blaisdell, 1964).Google Scholar