Compactness in quasi-Banach function spaces and applications to compact embeddings of Besov-type spaces

There are two main aims of the paper. The first is to extend the criterion for the precompactness of sets in Banach function spaces to the setting of quasi-Banach function spaces. The second is to extend the criterion for the precompactness of sets in the Lebesgue spaces Lp (ℝ n ), 1 ⩽ p < ∞, to...

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Veröffentlicht in:Proceedings of the Royal Society of Edinburgh. Section A. Mathematics 2016-10, Vol.146 (5), p.905-927
Hauptverfasser: Caetano, António, Gogatishvili, Amiran, Opic, Bohumír
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Gogatishvili, Amiran
Opic, Bohumír
description There are two main aims of the paper. The first is to extend the criterion for the precompactness of sets in Banach function spaces to the setting of quasi-Banach function spaces. The second is to extend the criterion for the precompactness of sets in the Lebesgue spaces Lp (ℝ n ), 1 ⩽ p < ∞, to the so-called power quasi-Banach function spaces. These criteria are applied to establish compact embeddings of abstract Besov spaces into quasi-Banach function spaces. The results are illustrated on embeddings of Besov spaces , into Lorentz-type spaces.
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subjects Criteria
Function space
title Compactness in quasi-Banach function spaces and applications to compact embeddings of Besov-type spaces
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