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对一种类型实方矩阵的探讨
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作者 郭娟 姜泽宏 《东北电力学院学报》 1997年第3期27-35,共9页
对各种类型较低阶对稳正定矩阵提出判定准则,利用这些准则,给出了矩阵方程AX=B的逆问题解存在的充分必要条件和解的一般形式。
关键词 矩阵 对称半正定 矩阵方程
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OSCILLATION THEOREMS FOR NONLINEAR NEUTRAL PARTIAL DIFFERENTIAL EQUATIONS WITH DEVIATING ARGUMENTS
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作者 关新平 杨军 刘文远 《Annals of Differential Equations》 1996年第1期40-47,共8页
This paper discusses the oscillation of solutions for nonlinear neutral partial differential equation in the form of Sufficient conditions are obtained for oscillation of solutions,of this equation, which extend and ... This paper discusses the oscillation of solutions for nonlinear neutral partial differential equation in the form of Sufficient conditions are obtained for oscillation of solutions,of this equation, which extend and improve some known results. Where n is bounded domain in R' with piecewise smooth boundary and △is the Laplacian in Euclidean n -space R'. 展开更多
关键词 and phrases partial differential equation nonlinear neutral deviating argument oscillation theorem
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