Definition:Absolutely Convergent Series/General

Definition
Let $V$ be a normed vector space with norm $\norm {\, \cdot \,}$.

Let $\displaystyle \sum_{n \mathop = 1}^\infty a_n$ be a series in $V$.

Then the series $\displaystyle \sum_{n \mathop = 1}^\infty a_n$ in $V$ is absolutely convergent $\displaystyle \sum_{n \mathop = 1}^\infty \norm {a_n}$ is a convergent series in $\R$.

Also see

 * Definition:Conditionally Convergent Series, the antithesis of absolutely convergent series.
 * Absolutely Convergent Series is Convergent, which shows that an absolutely convergent series in a Banach space is also convergent.