Abstract
We obtain the boundedness of Calderon-Zygmund singular integral operators T of non-convolution type on Hardy spaces H p (X) for 1/(1 + e) < p ⩽ 1, where X is a space of homogeneous type in the sense of Coifman and Weiss (1971), and e is the regularity exponent of the kernel of the singular integral operator T. Our approach relies on the discrete Littlewood-Paley-Stein theory and discrete Calderon’s identity. The crucial feature of our proof is to avoid atomic decomposition and molecular theory in contrast to what was used in the literature.
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