In the present article, we have established a result on indexed Norlund summability factors by generalizing a theorem of Mishra and Sivastava [5] on Cesaro summabilty factors.

In the present paper, we estimate the rate of convergence of Fourier series of functions by Deferred Nörlund mean in Besov space which is a generalization of [Formula: see text] space.

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In this paper a theorem on degree of approximation of a function

A result concerning absolute indexed Summability factor of an infinite series using  -Quasi monotone sequence has been established.