The new sufficient conditions for the oscillation of all solutions of the neutral differential equation with continuous and piecewise constant arguments are obtained.

获得了一类带有连续和分段常数变元的中立型微分方程所有解振动的新的充分条件。

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Furthermore, the author gives the oscillation criteria of some partial difference equation with continuous variables.

此外，作者还给出了一类具有连续变量的偏差分方程的振动准则。

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The following conclusions are obtained: 1. the density wave in an unstable area develops a finite continuous oscillation.

得到如下一些重要结论：1。不稳定区域密度波振荡为有限的持续振荡。

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