Some Unicity Theorems Of Meromorphic Functions

By using the Nevanlinna's value distribution theory, this dissertation studies the problems of the uniqueness of meromorphic functions in four aspects, and several unicity theorems are obtained. In this dissertation, we study the uniqueness of transecndental entire functions sharing one small function with its derivatives which answer the question of Kit-wing Wu, and the uniqueness of entire functions share one value IM, and the uniqueness of meromorphic functions sharing two common range sets, and the uniqueness of meromorphic functions sharing three common range sets. The results obtained in this dissertation perfect and generalize the present conclusions.