We show that the Hardy operator
from \( L_{{\text{dec}},w}^{p),\theta } \) (I) to \( L_w^{p),\theta } \) (I), 0 < p < ∞, θ > 0, I = (0, 1), is bounded if and only if the weight w belongs to the well–known class Bp restricted to the interval I. This result is applied to derive a similar assertion for the Riemann–Liouville fractional integral operator and to establish criteria for the boundedness of the Hardy–Littlewood maximal operator in the weighted grand Lorentz space \( \Lambda_w^{p),\theta } \). Bibliography: 23 titles.
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Translated from Problems in Mathematical Analysis 60, September 2011, pp. 53–64.
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Meskhi, A. Weighted criteria for the hardy transform under the B p condition in grand lebesgue spaces and some applications. J Math Sci 178, 622–636 (2011). https://doi.org/10.1007/s10958-011-0574-5
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DOI: https://doi.org/10.1007/s10958-011-0574-5