Displaying similar documents to “A survey of certain results on strong approximation by orthogonal series”

Pointwise strong approximation of almost periodic functions

Radosława Kranz, Włodzimierz Łenski, Bogdan Szal (2016)

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Similarity:

We consider the class GM(₂β) in pointwise estimate of the deviations in strong mean of almost periodic functions from matrix means of partial sums of their Fourier series.

On the rate of strong summability of double Fourier series

Włodzimierz Łenski, Maria Topolewska (1998)

Mathematica Bohemica

Similarity:

Estimates of the strong means of Marcinkiewicz type with the Cesaro means of negative order in one of the variables instead of square partial sums are obtained by characteristics constructed on the basis of moduli of continuity.

New results for almost increasing sequences

Bağdagül Kartal (2019)

Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica

Similarity:

In the present paper, two theorems of absolute summability have been proved by using the definition of almost increasing sequence.