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Given $n \in \mathbb{Z}$, is it possible to construct a holomorphic function $f : \mathbb{C} \rightarrow \mathbb{C}$ such that $f(n) \neq 0$, but for any integer $m \neq n$ we have $f(m)=0$?

This is actually a homework problem in algebra which I reduced to this statement (in case it is correct).

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up vote 4 down vote accepted

Here's a hint: $\dfrac{\sin z}{z}$.

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Got it! Thanks. –  Elena Jun 9 '12 at 9:36
    
You're welcome! –  Hans Lundmark Jun 9 '12 at 9:39
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