科研之友
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摘要
The Valiron-Mohon'ko theorem plays an important role in the theory of complex differential equations. In this paper, a difference analogue of the Valiron-Mohon'ko theorem is established, which can be used to get the characteristic functions on irreducible rational functions of f(z) and its shifts. Using our results and some properties of periodic functions, the proof of [10, Theorem 1.1] can be organized in a short way.
