Sufficient dyadic conditions are obtained for functions in the Lebesgue space L^p ([0, +) ) with 1 p 2, ensuring the integrability of their Fourier-Walsh transforms. These conditions are expressed in terms of moduli of smoothness and are shown to be sharp. As a result, a recent result established by Platonov in this framework is deduced.
Othman Tyr (2026) studied this question.
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