On stable methods of summing Fourier-Laplace series
Perturbation (in the \(\ell^2\) metric) of the Fourier coefficients may cause instability of the Fourier series in the space of continuous functions. A. N. Tikhonov found a stable approximation method for Fourier series. In the paper under review the same problem is solved for spherical harmonic series.
scientific article; zbMATH DE number 1462514