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Generic differentiability of locally Lipschitz functions on product spaces

Published online by Cambridge University Press:  17 April 2009

J.R. Giles
Affiliation:
Department of MathematicsThe University of NewcastleNew South Wales 2308Australia
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Abstract

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Although it is known that locally Lipschitz functions are densely differentiable on certain classes of Banach spaces, it is a minimality condition on the subdifferential mapping of the function which enables us to guarantee that the set of points of differentiability is a residual set. We characterise such minimality by a quasi continuity property of the Dini derivatives of the function and derive sufficiency conditions for the generic differentiability of locally Lipschitz functions on a product space.

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 1995

References

[1]Borwein, J.M., ‘Minimal cuscos and subgradients of Lipschitz functions’, in Fixed point theory and its applications (Pitman Research Notes 252, 1991), pp. 5781.Google Scholar
[2]Borwein, J., Fitzpatrick, S. and Kenderov, P., ‘Minimal convex uscos and monotone operators on small sets’, Canad. J. Math. 43 (1991), 461476.CrossRefGoogle Scholar
[3]de Barra, G., Fitzpatrick, S. and Giles, J.R., ‘On generic differentiability of locally Lipschitz functions on Banach space’, Proc. Centre Math. Anal. Austral. Nat. Univ. 20 (1988), 3949.Google Scholar
[4]Giles, J.R. and Bartlett, M.O., ‘Modified continuity and a generalisation of Michael's selection theorem’, Set-Valued Anal. 1 (1993), 365378.CrossRefGoogle Scholar
[5]Giles, J.R. and Sciffer, S., ‘Continuity characterisations of differentiability of locally Lipschitz functions’, Bull. Austral. Math. Soc. 41 (1990), 371380.CrossRefGoogle Scholar
[6]Giles, J.R. and Sciffer, S., ‘Locally Lipschitz functions are generically pseudo-regular on separable Banach spaces’, Bull. Austral. Math. Soc. 47 (1993), 205212.CrossRefGoogle Scholar
[7]Giles, J.R. and Sciffer, S., ‘Generalising generic differentiability properties from convex to locally Lipschitz functions’, J. Math. Anal. Appl. 188 (1994), 833854.CrossRefGoogle Scholar
[8]Giles, J.R. and Moors, W.B., ‘A continuity property related to Kuratowski's index of non-compactness, its relevance the the drop property and its implications for differentiability theory’, J. Math. Anal. Appl. 178 (1993), 247268.CrossRefGoogle Scholar
[9]Marcus, S., ‘Sur les fonctions dérivées, intégrables, au sens de Riemann et sur les dérivées partialles mixtes’, Proc. Amer. Math. Soc. 9 (1958), 973978.Google Scholar
[10]Martin, N.F.G., ‘Quasi–continuous functions on product spaces’, Duke Math. J. 28 (1961), 3944.CrossRefGoogle Scholar
[11]Moors, W.B., ‘A characterisation of minimal subgradients of locally Lipschitz functions’, Set-Valued Anal. (to appear).Google Scholar
[12]Phelps, R.R., Convex functions, monotone operators and differentiability, Lecture Notes in Math. 1364 (Springer-Verlag, Berlin, Heidelberg, New York, 1993).Google Scholar
[13]Pompeiu, D., ‘Sur les fonctions dérivées’, Math. Ann. 63 (1907), 326332.CrossRefGoogle Scholar
[14]Preiss, D., ‘Fréchet derivatives of Lipschitz functions’, J. Funct. Anal. 91 (1990), 312345.CrossRefGoogle Scholar
[15]Preiss, D., Phelps, R.R. and Namioka, I., ‘Smooth Banach spaces, weak Asplund spaces and monotone or usco mappings’, Israel J. Math. 72 (1990), 257279.CrossRefGoogle Scholar