Abstract
Starting from a slight modification of the dyadic sets introduced by M. Christ in [A T(b) theorem with remarks on analytic capacity and the Cauchy integral, Colloq. Math. 60/61 (1990) 601–628] on a space of homogeneous type ( X , d , μ ) , an MRA type structure and a Haar system H controlled by the quasi distance d, can be constructed in this general setting in such a way that H is an orthonormal basis for L 2 ( d μ ) . This paper is devoted to explore under which conditions on the measure ν , the system H is also an unconditional basis for the Lebesgue spaces L p ( d ν ) . As a consequence, we obtain a characterization of these spaces in terms of the H –coefficients.
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