Date of Publication :19th June 2019

Abstract: In this study we define the double sequences & series. In mathematics a sequence is an enumerated collection of objects in which repetitions are allowed. Like a set, it contains elements. The number of elements is called length and same elements can appear multiple times. Formally, a sequence can be defined as a function whose domain is a set of all natural numbers. The concept of Double sequences & series us an extension of single sequence & series. First we discuss about the single sequence and then extend them to the concept of Double sequences & series. Then discuss about the some results and examples related to them

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