Hostname: page-component-77c89778f8-sh8wx Total loading time: 0 Render date: 2024-07-18T10:23:40.284Z Has data issue: false hasContentIssue false

The smooth variational principle and generic differentiability

Published online by Cambridge University Press:  17 April 2009

Pando Grigorov Georgiev
Affiliation:
University of Sofia, Department of Mathematics and Informatics, 5 “Anton Ivanov” Boul., Sofia 1126, Bulgaria
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.

A modified version of the smooth variational principle of Borwein and Preiss is proved. By its help it is shown that in a Banach space with uniformly Gâteaux differentiable norm every continuous function, which is directionally differentiable on a dense Gδ subset of the space, is Gâteaux differentiable on a dense Gδ subset of the space.

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 1991

References

[1]de Barra, G., Fitzpatrick, S. and Giles, J.R., ‘On generic differentiability of locally Lipschitz functions on Banach space’, (preprint).Google Scholar
[2]Borwein, J. and Preiss, D., ‘A smooth variational principle with applications to subdifferentiability and to differentiability of convex functions’, Trans. Amer. Math. Soc. 303 (1987), 517527.CrossRefGoogle Scholar
[3]Ekeland, I. and Lebourg, G., ‘Generic Frechet differentiability and perturbed optimization problems in Banach spaces’, Trans. Amer. Math. Soc. 224 (1976), 193216.Google Scholar
[4]Fabian, M., ‘Differentiability via one sided directional derivatives’, Proc. Amer. Math. Soc. 82 (1982), 495500.Google Scholar
[5]Georgiev, P. Gr., ‘Locally Lipschitz and regular functions are Frechet differentiable almost everywhere in Asplund spaces’, Comp. Rend. Acad. Bulg. Set. 42 (1989), 1315.Google Scholar
[6]Hagler, J. and Sullivan, F., ‘Smoothness and weak* sequential compactness’, Proc. Amer. Math. Soc. 78 (1980), 497503.Google Scholar
[7]Kenderov, P.S., ‘The quasi-differentiable functionals are almost everywhere differentiable’, in Math, and Education Math., Proc. 2nd Spring Conf. Bulg. Math. Soc. pp. 123126 (Vidin, 1973).Google Scholar
[8]Kuratowski, K., Topology I (Academic Press, New York and London, 1966).Google Scholar
[9]Lau, Ka-Sing and Weil, C.E., ‘Differentiability via directional derivatives’, Proc. Amer. Math. Soc. 70 (1978), 1117.CrossRefGoogle Scholar
[10]Lebourg, G., ‘Generic differentiability of Lipschitzian functions’, Trans. Amer. Math. Soc. 256 (1979), 125144.CrossRefGoogle Scholar
[11]Phelps, R.R., ‘Convex functions, monotone operators and differentiability’, in Lecture Notes in Math 1364, 1989.CrossRefGoogle Scholar
[12]Zajicek, L., ‘A generalization of an Ekeland-Lebourg theorem and the differentiability of distance functions’, Rend. Circ. Mat. Palermo Suppl 3 (1984), 403410.Google Scholar
[13]Zhivkov, N.V., ‘Generic Gâteaux differentiability of locally Lipschitz functions’, in Proc. Conf. Constructive Function Theory '81, pp. 590594 (Sofia, 1983).Google Scholar
[14]Zhivkov, N.V., ‘Generic Gâteaux differentiability of directionally differentiable mappings’, Rev. Roumaine Math. Pures Appl. 32 (1987), 179188.Google Scholar