Pointwise strong approximation of almost periodic functions in S^1
We consider the class GM(2b) in pointwise estimate of the deviations in strong mean of S^1 almost periodic functions from matrix means of partial sums of their Fourier series.
Points of strong summability of Fourier series
In this paper we present a new solution of Hardy and Littlewood's problem concerning strong summability of Fourier series; we also present a property of points of strong summability.
On trigonometric series with quasimonotone coefficients
Abstract A result of Hardy, giving a necessary and sufficient condition for a trigonometric series with decreasing coefficients to have an asymptotic sum, is extended to the case of coefficients, quasimonotone in either sense. It is shown that in a certain sense the results are best possible.