摘要
本文主要讨论二阶非线性微分方程(r(t)x′(t))′+p(t)f(x(t))g(x′(t))=0得到方程的一些新的振动准则.这些结果改进了Wintner,Hartman,Kamenev,Yan和Philos利用通常的黎卡提变换u(t)=a(t)r(t)xx′((tt))+k(t),其中k∈C1是[t0,∞)上的连续函数,和a(s)=exp{-2∫sk(ξ)dξ}所得的振动准则.
This paper discusses the oscillation of second order nonlinear differential equations (r(t)x'(t) )' +p(t)f(x(t) )g(x'(t) ) =0 Some new oscillation criteria for the equations are obtained. These results improve oscillation criteria of Wintner, Hartman, Kamenev, Yan and Philos using a generalized Riccati transformation u ( t ) = a ( t ) r ( t ). {x'(t)/x(t)+k(t) }. Where k∈C^1 is a given function on [t0,∞ )and a(s)=exp{-2}k(ξ)dξ}.
出处
《山西师范大学学报(自然科学版)》
2005年第4期6-13,共8页
Journal of Shanxi Normal University(Natural Science Edition)
关键词
非线性微分方程
正常解
振动性
黎卡提变换
Nonlinear differential equation
Proper solution
Oscillation
Riccati transformation