Continuous Implies Locally Bounded
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Theorem
Let $X$ be a topological space.
Let $M$ be a metric space.
Let $f: X \to M$ be continuous.
Then $f$ is locally bounded.
Proof
Let $x \in X$.
Let $U = \map {f^{-1} } {\map B {\map f x, 1} }$.
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By continuity, $U$ is a neighborhood of $x$.
Because $\map f U \subset \map B {\map f x, 1}$, $f$ is bounded on $U$.
Thus $f$ is locally bounded.
$\blacksquare$