# Definition:Absolutely Convergent Series/General

## Definition

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

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

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