Topological Vector Space over Topological Field remains Topological Vector Space with Weak Topology
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Theorem
Let $K$ be a topological field.
Let $X$ be a topological vector space over $K$ admitting a weak topology $w$.
Then $\struct {X, w}$ is a topological vector space.
Corollary
Let $K$ be a Hausdorff topological field.
Let $X$ be a topological vector space over $K$ admitting a weak topology $w$.
Then $\struct {X, w}$ is a Hausdorff topological vector space.
Proof
Follows from combining:
$\blacksquare$