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A truncated real interpolation method and characterizations of screened Sobolev spaces

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arxiv 2003.12518 v2 pith:5FCED4Q3 submitted 2020-03-27 math.FA math.AP

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keywords screenedmethodsobolevspacesspacebesovcharacterizationsinterpolation
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In this paper we prove structural and topological characterizations of the screened Sobolev spaces with screening functions bounded below and above by positive constants. We generalize a method of interpolation to the case of seminormed spaces. This method, which we call the truncated method, generates the screened Sobolev subfamily and a more general screened Besov scale. We then prove that the screened Besov spaces are equivalent to the sum of a Lebesgue space and a homogeneous Sobolev space and provide a Littlewood-Paley frequency space characterization.

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