let $f$ be a entire function and $B$ is bounded open set.
Then is it true that
$\partial(f(B)) \subset f(\partial B)$.
Hint is given that use open mapping theorem . But i got stuck how to use it. please provide some hint
2026-03-26 01:16:03.1774487763
let $f$ be a entire function and $B$ is bounded open set. $\partial(f(B)) \subset f(\partial B)$.
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