Abstract
Let b ∈ L loc(ℝn) and L denote the Littlewood-Paley operators including the Littlewood-Paley g function, Lusin area integral and g *λ function. In this paper, the authors prove that the L p boundedness of commutators [b, L] implies that b ∈ BMO(ℝn). The authors therefore get a characterization of the L p-boundedness of the commutators [b, L]. Notice that the condition of kernel function of L is weaker than the Lipshitz condition and the Littlewood-Paley operators L is only sublinear, so the results obtained in the present paper are essential improvement and extension of Uchiyama’s famous result.
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This work was partially supported by National Natural Science Foundation of China (Grant No. 10931001, 10826046) and Specialized Research Foundation for Doctor Programme (Grant No. 20050027025)
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Chen, Y., Ding, Y. Commutators of Littlewood-Paley operators. Sci. China Ser. A-Math. 52, 2493–2505 (2009). https://doi.org/10.1007/s11425-009-0178-4
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DOI: https://doi.org/10.1007/s11425-009-0178-4