本文研究 Lienard方程 x+f(x)x+g(x)=0.建立了方程(1)存在极限环或极限环唯一的若干充分条件,改进了文[2-6]等的结果。
In this paper, we consider Li?nard equation x+f(x)x+g(x)=0.(1) Some sufficient conditions for ensuring that (1) has at least orat most one limit cycle are given, which improve the results in [2--6].
庾建设,钱祥征. Liénard方程极限环的存在唯一性定理[J].湖南大学学报：自然科学版,1989,16(4):
