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Convergent series. In mathematics, a series is the sum of the terms of an infinite sequence of numbers. More precisely, an infinite sequence defines a series S that is denoted. {\displaystyle S=a_ {1}+a_ {2}+a_ {3}+\cdots =\sum _ {k=1}^ {\infty }a_ {k}.} The n th partial sum Sn is the sum of the first n terms of the sequence; that is,
In mathematics, summation by parts transforms the summation of products of sequences into other summations, often simplifying the computation or (especially) estimation of certain types of sums. It is also called Abel's lemma or Abel transformation, named after Niels Henrik Abel who introduced it in 1826.
The nth partial sum of the series is the triangular number = = (+), which increases without bound as n goes to infinity. Because the sequence of partial sums fails to converge to a finite limit, the series does not have a sum.
List of mathematical series. This list of mathematical series contains formulae for finite and infinite sums. It can be used in conjunction with other tools for evaluating sums. is a Bernoulli polynomial. is an Euler number. is the Riemann zeta function. is the gamma function. is a polygamma function. is a polylogarithm.
The previous formula becomes. {\displaystyle \sum _ {1\leq n\leq x}a_ {n}\phi (n)=A (x)\phi (x)-\int _ {1}^ {x}A (u)\phi ' (u)\,du.} A common way to apply Abel's summation formula is to take the limit of one of these formulas as . The resulting formulas are. These equations hold whenever both limits on the right-hand side exist and are finite ...
In mathematical analysis, Cesàro summation (also known as the Cesàro mean[1][2] or Cesàro limit[3]) assigns values to some infinite sums that are not necessarily convergent in the usual sense. The Cesàro sum is defined as the limit, as n tends to infinity, of the sequence of arithmetic means of the first n partial sums of the series.
In general, grouping the terms of a series creates a new series with a sequence of partial sums that is a subsequence of the partial sums of the original series. This means that if the original series converges, so does the new series after grouping: all infinite subsequences of a convergent sequence also converge to the same limit.
Using sigma summation notation the sum of the first m terms of the series can be expressed as = (). The infinite series diverges, meaning that its sequence of partial sums, (1, −1, 2, −2, 3, ...), does not tend towards any finite limit.