In this paper,the unicity of entire function concerning their difference and higher derivative is studied by using Nevanlinna theory of meromorphic functions and prove:let f(z)be a transcendental entire function of finite order.Let a(z)be a small function off(z),iff(z+c)or △c f and f(k)(z)CM share a(z),then the specific form of f(z)is obtained.
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