Thursday, 19 October 2006

cv.complex variables - Elementary functions with zeros only at the positive integers

Does there exist a (meromorphic) elementary function $f(z)$ that is zero at all the positive integers $z = 1, 2, 3, ldots$ and only at those points?



Edit: an elementary function can be written as a finite composition of constants, rational functions, exponentials and logarithms.



Obviously a function with those zeros can be constructed using the gamma function or a Weierstrass product, but the question is whether there is an elementary function.

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