Abstract
We extend the construction of Garsia-Rodemich spaces in different directions. We show that the new space B, introduced by Bourgain, Brezis and Mironescu [6], can be described via a suitable scaling of the Garsia-Rodemich norms. As an application we give a new proof of the embeddings BMO ⊂ B ⊂ L(n’,∞). We then generalize the Garsia-Rodemich construction and introduce the GaRoX spaces associated with a rearrangement-invariant space X, in such a way that GaRoX = X, for a large class of rearrangement-invariant spaces. The underlying inequality for this new characterization of rearrangement-invariant spaces is an extension of the rearrangement inequalities of [17]. We introduce Gagliardo seminorms adapted to rearrangement-invariant spaces and use our generalized Garsia-Rodemich construction to prove Fractional Sobolev inequalities in this context.
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The author was partially supported by a grant from the Simons Foundation (#207929 to Mario Milman)
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Milman, M. Garsia-Rodemich Spaces: Bourgain-Brezis-Mironescu space, embeddings and rearrangement-invariant spaces. JAMA 139, 121–141 (2019). https://doi.org/10.1007/s11854-019-0054-2
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DOI: https://doi.org/10.1007/s11854-019-0054-2