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Weak compactness of Fréchet-derivatives: application to composition operators
Published online by Cambridge University Press: 09 April 2009
Abstract
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.
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- Copyright © Australian Mathematical Society 1980