【摘要】 讨论了非线性振动方程:x+f(x)x+g(x)=0在G(±∞)=+∞的限制被取消时,其极限环的存在性更多还原

【Abstract】 The existence of limit cycles for the nonlinear oscillation equation x+ f( x) x+g( x) =0 is discussed,in which the hypothesis of G(±∞ ) =+∞ is omitted.更多还原