Comptes Rendus
Functional analysis
Sparse Brudnyi and John–Nirenberg Spaces
Comptes Rendus. Mathématique, Volume 359 (2021) no. 8, pp. 1059-1069.

A generalization of the theory of Y. Brudnyi [7], and A. and Y. Brudnyi [5, 6], is presented. Our construction connects Brudnyi’s theory, which relies on local polynomial approximation, with new results on sparse domination. In particular, we find an analogue of the maximal theorem for the fractional maximal function, solving a problem proposed by Kruglyak–Kuznetsov. Our spaces shed light on the structure of the John–Nirenberg spaces. We show that SJN p (sparse John–Nirenberg space) coincides with L p ,1<p<. This characterization yields the John–Nirenberg inequality by extrapolation and is useful in the theory of commutators.

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Accepted:
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DOI: 10.5802/crmath.252
Classification: 42B35, 42B25, 46E30, 46E35

Óscar Domínguez 1; Mario Milman 2

1 O. Domínguez, Departamento de Análisis Matemático y Matemática Aplicada, Facultad de Matemáticas, Universidad Complutense de Madrid, Plaza de Ciencias 3, 28040 Madrid, Spain.
2 M. Milman, Instituto Argentino de Matematica, Buenos Aires, Argentina
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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Óscar Domínguez; Mario Milman. Sparse Brudnyi and John–Nirenberg Spaces. Comptes Rendus. Mathématique, Volume 359 (2021) no. 8, pp. 1059-1069. doi : 10.5802/crmath.252. https://comptes-rendus.academie-sciences.fr/mathematique/articles/10.5802/crmath.252/

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