具变符号系数的四阶中立型时滞微分方程的振动性
Journal of Shanxi Datong University(Natural Science Edition)（2014）
Abstract
当系数q(t)变号时,研究了四阶中立型时滞微分方程[y(t)+p(t)y(t-τ)](4)+q(t)y(t-τ)=0的振动性,得到该方程振动的一个充分性定理.
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