Oscillation of Second Order Nonlinear Neutral Functional Differential Equation

The oscillation of second order nonlinear neutral functional differential equation r(t)φx(t)z'(t)'+q(t)gx(t),x'(t)+k(t)fx(σ(t)) =0 t≥t0 r(t)φx(t)z'(t)'+q(t)fxσ(t)gt,x'(t)=0 t≥t0 is discussed,of which z(t)=x(t)+p(t)x((t)) obtains sufficient conditions.The application of the theorem is illustrated.