摘要
对一类抽象分歧数据 ,给出一个充分必要条件 。
branch data,this paper gives a sufficient and necessary condition of them to be realized as the branch data of some branched coverings over the Riemann sphere.
出处
《中国科学院研究生院学报》
CAS
CSCD
2004年第3期299-304,共6页
Journal of the Graduate School of the Chinese Academy of Sciences