
Necessary and sufficient conditions for the boundedness of the discrete Hardy's operator of the form \(Pf(n)= \sum^ n_{k=1} f(k)\), from \(l^ p_ v\) to \(l^ q_ u\) when \(0< q< 1< p<\infty\) is given.
discrete Hardy's operator, Halperin's lemma, Maximal functions, Littlewood-Paley theory, discrete Hardy's inequality, Inequalities for sums, series and integrals, boundedness
discrete Hardy's operator, Halperin's lemma, Maximal functions, Littlewood-Paley theory, discrete Hardy's inequality, Inequalities for sums, series and integrals, boundedness
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