高阶微分组次谱的万有估计不等式

对高阶微分组的低阶离散谱进行估计,首先选择合适的试验函数,利用广义Rayleigh商,得到估计次谱上界的基本不等式,然后用数学归纳法和Schwarz不等式等方法,发现这类问题的主谱与其相应特征向量之间存在的不等式关系,获得用主谱估计次谱上界的万有不等式.

Remarks on Oscillation for Systems of High Order Partial Differential Equations of Neutral Type

In this paper, some sufficient conditions are obtained for the oscillation for solutions of systems of high order partial differential equations of neutral type.