摘要
§1 前言陈省身教授在中国科学院数学研究所讲学时,联系到空间曲线的封闭性问题。
In this paper, we discuss the special one order differential equation (dy)/(dx)=sum from i=0 to n(A_i(x)y^i)we use Brouwer fixed point theorem to give both necessary conditions and. cifficient conditions for cxistensc of periodic solutions. we also give the criteria of stability and position of periodic solutions.
出处
《纯粹数学与应用数学》
CSCD
1989年第5期57-65,共9页
Pure and Applied Mathematics
