The first part of this paper discusses the motivation for the Lu Qi-Keng conjecture and the results about the presence o......

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首先建立了一个Ｐｉｃｏｎｅ型的恒等式及两个Ｓｔｕｒｍ型的比较定理。利用它们定量地给出一类二阶中立型微分方程所有解振动的充分条件，著名的关于二阶常......

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In a typical Kenyan HIV clinical setting, there is a likelihood of registering many zeros during the routine monthly dat......