摘要
给出了以下时滞方程组ｘ′ｉ（ｔ）＝∑ｎｊ＝１ａｉｊｘｊ（ｔ－τ），ｔ＞０，ｉ＝１，…，ｎ（其中ａｉｊ和τ为实常数，且τ＞０）所有解振动的一个便于验证的充要条件．
Sufficient and necessary conditions are obtained for all solutions (or bounded solutions) of the system of differential equations with one retarded argument x′ i(t)=∑nj=1a ij x j(t-τ),t>0,i=1,2,…,n d to be oscillatory, where a ij and τ are real constants with τ>0
