If be given real valued sequence, then an expression of the form

is called an infinite series. In symbols it is generally written as or .

If all the terms of after a certain number are zero then the expression , written is called a finite series. Simply speaking, even without any reference to the sequence, an expression of the form is called a finite series.

__Sequence of Partial Sums of an Infinite Series__:

An expression of the form which involves addition of infinitely many terms has in itself no meaning. In order to give a meaning to the value of such an infinite sum, we form a sequence of partial sums. It is the limit of such a sequence which gives meaning to the infinite series.

Let us associate to the infinite series a sequence define by, . The sequence is called the sequence of partial sums of the given series .

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