Approximation by Double Deferred Nörlund Means of Double Fourier Series for Lipschitz Functions
Approximation by Double Deferred Nörlund Means of Double Fourier Series for Lipschitz Functions
In this paper, the concept of Double Deferred Nörlund means is defined and some important results are obtained. Particularly, we investigate the rate of uniform approximation by Double Deferred Nörlund means of the rectangular partial sums of the double Fourier series of a function belong to on the two dimensional …