具有“积分小”系数的一阶非线性中立型微分方程的振动性

Oscillation of First Order Nonlinear Neutral Differential Equations with "Integrally Small" Coefficients

运用一定的技巧，建立了一阶非线性中立型微分方程［ｘ（ｔ）－Ｐ（ｔ）ｘ（ｔ－τ］’＋ Ｑ（ｔ）ｘ（ｔ－δ_ｉ）αｉｓｉｇｎｘ（ｔ－δ_ｉ）＝０的所有解振动的新的充分条件，推广和改进了已知文献 中的某些已知结论。

Using some technique, we obtain several new sufficient conditions for the oscillation of all solutions of the neutral equation differential [x(t) - p(t)x(t - )]' + Q(t) x(t -δ_i) signx(t -δ_i ) =0. Our results extend and improve some of the known results in the literature.