Meromorphic |Functions |with Derivatives Sharing Four |Small |Functions
导数具四个公共小函数的亚纯函数

In this paper, the author mainly discusses the uniqueness problem of derivatives of meromorphic functions that share four small functions, and considers that the case of Nevanlinna's Four Values Theorem when the derivatives of meromorphic functions that share some small functions, which generalizes and improves a recent result by the author.