Definition:Convergent Series/Normed Vector Space/Definition 1
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Definition
Let $V$ be a normed vector space.
Let $d$ be the induced metric on $V$.
Let $\ds S := \sum_{n \mathop = 1}^\infty a_n$ be a series in $V$.
$S$ is convergent if and only if its sequence $\sequence {s_N}$ of partial sums converges in the metric space $\struct {V, d}$.