Abstract
We obtain a criterion given in terms of the Fourier-Haar co-efficients for the function f(x1, x2) to belong to the net space Np̄, q̄(M) and to the Lebesgue space Lp̄[0, 1]2 with mixed metric, where 1 < p̄ < ∞,0 < q̄ ≤ ∞, p̄ =(p1, p2), q̄=(q1, q2) and M is the set of all rectangles in ℝ2. We prove the Hardy-Littlewood theorem for multiple Fourier-Haar series.
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This work was supported by the Ministry of Education and Science of the Republic of Kazakhstan (Grant AP08856479).
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Bashirova, A.N., Nursultanov, E.D. The Hardy—Littlewood theorem for double Fourier—Haar series from mixed metric Lebesgue Lp̄[0, 1]2 and net Np̄, q̄(M) spaces. Anal Math 48, 5–17 (2022). https://doi.org/10.1007/s10476-022-0115-0
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DOI: https://doi.org/10.1007/s10476-022-0115-0