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Lions' representation theorem and applications

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Abstract

The Lions' Representation Theorem (LRT) is a version of the Lax-Milgram Theorem where completeness of one of the spaces is not needed. In this paper, LRT is deduced from an operator-theoretical result on normed spaces, which is of independent interest. As an example, we give a new characterization of dissipativity. The main part of the paper is a theory of derivations, based on LRT, which we develop. Its aim is to establish well-posedness results, not only for evolution in time but also for more general settings in terms of this new notion of derivation. One application concerns non-autonomous evolution equations with a new kind of boundary condition where values at the initial and final time are mixed.
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Dates and versions

hal-03903110 , version 1 (16-12-2022)

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  • HAL Id : hal-03903110 , version 1

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Wolfgang Arendt, Isabelle Chalendar, Robert Eymard. Lions' representation theorem and applications. 2022. ⟨hal-03903110⟩
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