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Counterexample

Is this true?

Zeros of a non-constant holomorphic function cannot accumulate

No — it is false.

The counterexample

sin(1/z) on C\mathbb{C}∖{0}

Why it fails

Zeros 1/(nπ)1/(n\pi) accumulate at 0, which lies outside the domain. Inside the domain zeros are always isolated.

Go deeper· Explained in full in Analyticity, the identity theorem and zeros· Asked in CSIR NET June 2025· From Analytic Functions › Power series and analyticity

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