具有正负系数的中立型微分方程的振动性

Oscillation of neutral equations with positive and negative coefficients

研究具有正负系数的中立型微分方程(x(t) - Cx(t- r) )′+px(t-τ) - qx(t-σ) =0 (* )在允许 C+q(τ- σ)≤ 1不成立的条件下 ,建立了方程 (* )的振动性准则 .

Consider the neutral differenal equations with positive and negative coefficients (x(t)-Cx(t-r))′+px(t-τ)-qx(t-σ)=0,(*) one sufficient condition for the oscillation of Eq.(*) are obtained with C+q(τ-σ)≤1 is not satisfied.