Convergence problems of multiple trigonometric series and spectral decompositions. I. (English) Zbl 0367.42008
MSC:
42A20 | Convergence and absolute convergence of Fourier and trigonometric series |
42C15 | General harmonic expansions, frames |
42A24 | Summability and absolute summability of Fourier and trigonometric series |
35D10 | Regularity of generalized solutions of PDE (MSC2000) |
42B05 | Fourier series and coefficients in several variables |