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A real series $S_n$ is the limit to infinity of the sequence of partial sums of a real sequence $\sequence {a_n}$:

\(\displaystyle S_n\) \(=\) \(\displaystyle \lim_{N \mathop \to \infty} \sum_{n \mathop = 1}^N a_n\)
\(\displaystyle \) \(=\) \(\displaystyle \sum_{n \mathop = 1}^\infty a_n\)
\(\displaystyle \) \(=\) \(\displaystyle a_1 + a_2 + a_3 + \cdots\)

Historical Note

Much of the original work on series of real and complex numbers was done by Leonhard Paul Euler.

The main bulk of the work to placed the concept on a rigorous footing was done by Carl Friedrich Gauss, Niels Henrik Abel‎ and Augustin Louis Cauchy.