Abstract
In a previous paper Guo et al. (Fractional integration on mixed norm spaces. I. Preprint, 2022), we characterized the boundedness of fractional integration operators between mixed norm spaces over the unit disk. In this paper, we characterize the boundedness between X and Y, where
As in Guo et al. (Fractional integration on mixed norm spaces. I. Preprint, 2022), we cover three types of fractional integration: Flett, Hadamard, and Riemann-Liouville, and we consider complex orders \(t \in \mathbb {C}\) instead of mere \(t \in \mathbb {R}\). Our findings provide, in particular, a complete answer to a problem started by Flett in 1972 (Theorem C).
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Acknowledgements
Fang is supported by Ministry of Science and Technology (Taiwan) (MOST) (108-2628-M-008-003-MY4). Hou is supported by National Natural Science Foundation (NNSF) of China (Grant No. 11971340).
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Zhu, X., Fang, X., Guo, F. et al. Fractional Integration on Mixed Norm Spaces. II. J Geom Anal 33, 158 (2023). https://doi.org/10.1007/s12220-023-01213-0
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DOI: https://doi.org/10.1007/s12220-023-01213-0