该文应用Ahlfors的覆盖曲面理论,讨论了复平面上超越亚纯函数的奇异方向,证明了亚纯函数涉及一类有理函数的T方向的存在性,又一次证实了郑建华的一个猜想.
In this paper,by using Ahlfors' theory of covering surface, the singular directions of meromorphic functions are discussed. The existence of T direction concerning a rational function is established, which confirms a Zheng's conjecture.