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On a generalization of \(L^p\)-differentiability

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Abstract

In this paper we connect Calderón and Zygmund’s notion of \(L^p\)-differentiability (Calderón and Zygmund, Proc Natl Acad Sci USA 46:1385–1389, 1960) with some recent characterizations of Sobolev spaces via the asymptotics of non-local functionals due to Bourgain, Brezis, and Mironescu (Optimal Control and Partial Differential Equations, pp. 439–455, 2001). We show how the results of the former can be generalized to the setting of the latter, while the latter results can be strengthened in the spirit of the former. As a consequence of these results we give several new characterizations of Sobolev spaces, a novel condition for whether a function of bounded variation is in the Sobolev space \(W^{1,1}\), and complete the proof of a characterization of the Sobolev spaces recently claimed in (Leoni and Spector, J Funct Anal 261:2926–2958, 2011; Leoni and Spector, J Funct Anal 266:1106–1114, 2014).

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Notes

  1. We follow the convention of the subsequent paper of Ponce [14] in taking mollifiers indexed by \(\epsilon \) instead of n.

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Acknowledgments

The author would like to thank Augusto Ponce for his discussions regarding this work and encouragement during the project. The author is supported by the Taiwan Ministry of Science and Technology under research grant MOST 103-2115-M-009-016-MY2.

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Correspondence to Daniel Spector.

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Communicated by H. Brezis.

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Spector, D. On a generalization of \(L^p\)-differentiability. Calc. Var. 55, 62 (2016). https://doi.org/10.1007/s00526-016-1004-9

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