具变号系数的四阶非线性变时滞微分方程的振动性
Journal of Shanxi Datong University(Natural Science Edition)（2010）
Abstract
在振动因子p(t)变号的情况下,研究四阶非线性微分方程x(4()t)+p(t)f(x(g(t)))=0的振动性,并得到方程振动的一个充分性定理.
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Key words
four-order differential equation,variable coefficient,variable delay,oscillation,nonlinear
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