Linear Span is Linear Subspace/Proof 2
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Theorem
Let $V$ be a vector space over a division ring $K$.
Let $S \subseteq V$ be a subset of $V$.
Then the linear span $\map \span S$ is a subspace of $V$.
Proof
This is a special case of Generated Submodule is Linear Combinations.
As such, the statement follows immediately from that theorem.
$\blacksquare$