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Equivalent characterizations of Hardy spaces with variable exponent via wavelets |
Xing FU() |
Faculty of Mathematics and Statistics, Hubei University, Wuhan 430062, China |
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Abstract Via the boundedness of intrinsic g-functions from the Hardy spaces with variable exponent, , into Lebesgue spaces with variable exponent, , and establishing some estimates on a discrete Littlewood-Paley g-function and a Peetre-type maximal function, we obtain several equivalent characterizations of in terms of wavelets, which extend the wavelet characterizations of the classical Hardy spaces. The main ingredients are that, we overcome the difficulties of the quasi-norms of by elaborately using an observation and the Fefferman-Stein vector-valued maximal inequality on , and also overcome the difficulty of the failure of q = 2 in the atomic decomposition of by a known idea.
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Keywords
Hardy space
Peetre-type maximal function
Littlewood-Paley g-function
variable exponent
wavelet
atom
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Corresponding Author(s):
Xing FU
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Issue Date: 23 September 2019
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