Abstract
In this paper we study the problem of normal families of meromorphic functions concerning shared values. Let F be a family of meromorphic functions in the plane domain and n, k be two positive integers such that , and let a, b be two finite complex constants such that . Suppose that (1) and share b in D for every pair of functions f, ; (2) All zeros of f have multiplicity at least k + 2 and all poles of f have multiplicity at least 2 for each in D; (3) Zeros of are not the b points of f(z) for each in D. Then F is normal in D. And some examples are provided to show the result is sharp.
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