finished metric spaces
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@ -304,7 +304,7 @@ Let $V$ be a vector space. A non-empty set $W \subset V$ is called a vector subs
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\begin{eg}
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Consider
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\[
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W = \set[chi \in \realn]{(\chi, \chi) \in \realn^2}
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W = \set[\chi \in \realn]{(\chi, \chi) \in \realn^2}
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\]
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This is a subspace, because
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\[
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