# Definition:Convergent Series/Normed Vector Space/Definition 2

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## Definition

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

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

$S$ is convergent if and only if its sequence $\sequence {s_N}$ of partial sums converges in the normed vector space $\struct {V, \norm {\, \cdot \,}}$.