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Characterization of Lipschitz Functions via Commutators of Multilinear Singular Integral Operators in Variable Lebesgue Spaces

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Abstract

Let \(\overrightarrow{b}=(b_{1},b_{2},\ldots,b_{m})\) be a collection of locally integrable functions and \(T_{\Sigma\overrightarrow{b}}\) the commutator of multilinear singular integral operator T. Denote by \(\mathbb{L}(\delta)\) and \(\mathbb{L}(\delta(\cdot))\) the Lipschitz spaces and the variable Lipschitz spaces, respectively. The main purpose of this paper is to establish some new characterizations of the (variable) Lipschitz spaces in terms of the boundedness of multilinear commutator \(T_{\Sigma\overrightarrow{b}}\) in the context of the variable exponent Lebesgue spaces, that is, the authors give the necessary and sufficient conditions for bj (j = 1, 2, …, m) to be \(\mathbb{L}(\delta)\) or \(\mathbb{L}(\delta(\cdot))\) via the boundedness of multilinear commutator from products of variable exponent Lebesgue spaces to variable exponent Lebesgue spaces. The authors do so by applying the Fourier series technique and some pointwise estimate for the commutators. The key tool in obtaining such pointwise estimate is a certain generalization of the classical sharp maximal operator.

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Acknowledgements

The authors cordially thank the anonymous referees who gave valuable suggestions and useful comments which have led to the improvement of this paper.

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Correspondence to Pu Zhang.

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Supported by the National Natural Science Foundation of China (Grant No. 11571160), the Research Funds for the Educational Committee of Heilongjiang (Grant No. 2019-KYYWF-0909) and the Reform and Development Foundation for Local Colleges and Universities of the Central Government (Grant No. 2020YQ07)

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Wu, J.L., Zhang, P. Characterization of Lipschitz Functions via Commutators of Multilinear Singular Integral Operators in Variable Lebesgue Spaces. Acta. Math. Sin.-English Ser. 39, 2465–2488 (2023). https://doi.org/10.1007/s10114-023-2164-0

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