变系数变时滞中立型微分方程解的振动性

OSCILLATIONS OF SULUTIONS OF NEUTRAL DIFFERENTIAL EQUATIONS WITH VARIABLE COEFFICIENTS AND DELAYS

建立了具有变系数变时滞的中立型方程振动的充分条件 ,并且当此类方程的所有系数和时滞变元都是常数时 ,这个充分条件也是必要的 .

Consider the neutral differential equations with variable coefficients and delays.It is established that the sufficient conditions for oscillation neutral differential of equations with variable coefficients and delays. And when all the coefficients and delays of the equations are constants, the conditions become both necessary and sufficient. The conclusions improve and extend some known results.