摘要
本文证明了一个比较原理，使方程x"+f(x)x'+g(x)=0的周期解存在性定理可以用来判断方程x"+h(x，x')x'+g(x)=0的周期解的存在性．
In this paper, a comparison principle is given so that the existence of periodic solutions to the equation x'+ h(x, x')x'+ g(x)=0 can be obtained by means of the existence of periodic solutions to the equation x'+f(x)x'+ g(x)=0.
出处
《应用数学》
CSCD
1997年第3期61-63,共3页
Mathematica Applicata
