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Weak compactness of Fréchet-derivatives: application to composition operators

Published online by Cambridge University Press:  09 April 2009

Peter Dierolf
Affiliation:
Mathematisches Institut der Universität München Theresienstr. 39 D-8000 München 2 Bundesrepublik Deutschland
Jürgen Voigt
Affiliation:
Mathematisches Institut der Universität München Theresienstr. 39 D-8000 München 2 Bundesrepublik Deutschland
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Abstract

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We prove a result on compactness properties of Fréchet-derivatives which implies that the Fréchet-derivative of a weakly compact map between Banach spaces is weakly compact. This result is applied to characterize certain weakly compact composition operators on Sobolev spaces which have application in the theory of nonlinear integral equations and in the calculus of variations.

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 1980

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