Definition:Cauchy Sequence/Topological Vector Space
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Definition
Let $\struct {X, \tau}$ be a topological vector space.
Let $\sequence {x_n}_{n \mathop \in \N}$ be a sequence in $X$.
We say that $\sequence {x_n}_{n \mathop \in \N}$ is Cauchy if and only if:
- for each open neighborhood $V$ of ${\mathbf 0}_X$ there exists $N \in \N$ such that:
- $x_n - x_m \in V$ for each $n, m \ge N$.
Sources
- 1991: Walter Rudin: Functional Analysis (2nd ed.) ... (previous) ... (next): $1.25$: Cauchy sequences