The Hardy-Littlewood theorem for double Fourier-Haar series from Lebesgue spaces $L_{\bar{p}}[0,1]$ with mixed metric and from net spaces $N_{\bar{p},\bar{q}}(M)$

A. N. Bashirova, E. D. Nursultanov

In terms of the Fourier-Haar coefficients, a criterion is obtained for the function $f(x_1,x_2)$ to belong to the net space $N_{\bar{p},\bar{q}}(M)$ and to the Lebesgue space $L_{…