G.Villar's Method^[4] is improved to prove theorems for the existence of periodic solution(limit cycles of Liènard equation and a more general class of nonlinear differential equations.The results obtained in...G.Villar's Method^[4] is improved to prove theorems for the existence of periodic solution(limit cycles of Liènard equation and a more general class of nonlinear differential equations.The results obtained in this paper conclude the corresponding theorems in [4].展开更多
文摘G.Villar's Method^[4] is improved to prove theorems for the existence of periodic solution(limit cycles of Liènard equation and a more general class of nonlinear differential equations.The results obtained in this paper conclude the corresponding theorems in [4].
