方程(Y(t)+(1/n)(sum from i=1 to n )P_i(t)y(t-τ_i))'+q(t)y(t-σ)=0的振动性

Oscillation of Equation(Y(t)＋■■P_i（t）y（t-τ_i））'＋q（t）y（t-σ）＝0

研究变系数中立型泛函微分方程的解的振动性问题，给出了方程的解振动的若干充分条件，改进了已有的结果。

Some new suffieient conditinns for oscillation of neutral differential equationare obtained Which improves the former results.