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 , f x y belong to 01 Lip on the two dimensional region , xy . We also obtain the rate of uniform approximation by Double Deferred Cesáro means. Özet. Bu çalışmada, Double Deferred Nörlund ortalaması kavramı tanımlandı ve bazı önemli sonuçlar elde edildi. Özellikle, iki boyutlu , xy torus bölgesinde 01 Lip sınıfına ait , f x y fonksiyonunun çift indisli Fourier serisinin dikdörtgensel kısmi toplamlarının çift indisli Deferred Nörlund ortalamasıyla düzgün yaklaşım oranını araştırıyoruz. Ayrıca; Double Deferred Cesáro ortalaması yardımı ile düzgün yaklaşım oranı elde ediyoruz. Anahtar Kelimeler: Sınırlı varyasyonlu fonksiyon, Ostrowski tipli eşitsizlikler, Riemann-Stieltjes integralleri.Sezgek, Dagadur / Cumhuriyet Sci.
In this paper, we construct new important subspaces D q p S, D q p W , D q p F and D q p B for a locally convex FK-space X containing ϕ, the space of finite sequences. Then, we show that there is a relation among these subspaces. Also, we study deferred Cesàro conullity of one FK-space with respect to another, and we give some important results. Finally, we examine the deferred Cesàro conullity of the absolute summability domain l A , and show that if l A is deferred Cesàro conull, then A cannot be l-replaceable.We recall (see [2,11]) that the f , β-duals of a subset X of w are 2020): primary 46A45, 40A05; secondary 40C05, 40D05.
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