具变系数变时滞非线性中立型微分方程非振动解的存在性

The existence of nonoscillatory solutions of nonlinear neutral differential equations with variable coefficients and delays

研究一阶具变系数时滞非线性中立型微分方程非振动解的存在性 ,建立了方程非振动解存在的充分条件 。

The existence of nonoscillatory solutions of first order nonolinear neutral equations with variable coefficlents and delays is studied.Some sufficient conditions for the existence of nonoscillatory solutions of the equations are established.The conclusions extend and improve some known results.