摘要
本文研究一般的中立混合型微分方程[x(t)+sum from i=1 to m p_ix(t-t_i)]+sum from k=1 to n q_kx(t-σ_k)+sum from j=1 to s r_jx(t+v_j)=0……(1)的振动性,这里所有p_i、q_k、r_j都是正常数,在文[1]的工作之基础上,我们建立了另一个有效和实用的充要条件。本文的方法适用于高阶的情形。
We consider the oscillations of the equation of the formwhere all pi,qi,,rj are psitive real numbers,On the basis of the work in literature [1],We established other more effective and practical necessary and sufficient conditions.
