We show that if for a nonzero complex number c the inverse images L1-1(c) and L2-1(c) of two functions in the extended Selberg class are the same, then L 1(s) and L 2(s) must be identical.
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The author thanks the referee for valuable comments and suggestions. The author was supported by the Mid-Career Researcher Program through an NRF grant funded by MEST 2010-0008706 .
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