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Sequentially complete

In mathematics, specifically in topology and functional analysis, a subspace S of a uniform space X is said to be sequentially complete or semi-complete if every Cauchy sequence in S converges to an element in S. X is called sequentially complete if it is a sequentially complete subset of itself.

Sequentially complete topological vector spaces
Every topological vector space is a uniform space so the notion of sequential completeness can be applied to them. Properties of sequentially complete topological vector spaces • A bounded sequentially complete disk in a Hausdorff topological vector space is a Banach disk. • A Hausdorff locally convex space that is sequentially complete and bornological is ultrabornological. == Examples and sufficient conditions ==
Examples and sufficient conditions
• Every complete space is sequentially complete but not conversely. • For metrizable spaces, sequential completeness implies completeness. Together with the previous property, this means sequential completeness and completeness are equivalent over metrizable spaces. • Every complete topological vector space is quasi-complete and every quasi-complete topological vector space is sequentially complete. == See also ==
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