György Gát, Ushangi Goginava
We discuss some convergence and divergence properties of two-dimensional (Nörlund) logarithmic means of two-dimensional Walsh-Fourier series of functions both in the uniform and in the Lebesgue norm. We give necessary and sufficient conditions for the convergence regarding the modulus of continuity of the function, and also the function space.
Double Walsh-Fourier series, logarithmic means, norm convergence.
MSC 2000: 42C10, 42B08