二阶非线性中立型时滞微分方程的振动定理

Oscillation Criteria for Second Order Nonlinear Delay Differentia l Equation of Neutral Type

研究了一类二阶非线性中立型时滞微分方程的振动性 ,通过引入参数函数H(t,s)k(S)并借助于广义Riccati变换得到该方程的几个新的振动准则 ,这些结果推广和改进了GaiMingjiu等的结果 .

The oscillation criteria of a class of sec ond order nonlinear delay differential equation of neutral type has been discussed .By inducting parameter function and using Riccati transformation,some new resul ts for the equation are obtained,these results improve oscillation criter ia of Gao Mingjiu.