In this paper, the stability in C_1 space for neutral delay systems is studied. Some new sufficient conditions for stability in C_1 space are obtained.

本文中研究了中立型时滞系统在C_1空间中的稳定性，获得了半线性和非线性中立型时滞系统在C_1空间中稳定性的一些充分条件。

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In this paper, we consider the oscillation of a class of even order nonlinear neutral differential equations, some new sufficient conditions are established.

本文用不同于原有文献的方法研究了一类偶数阶中立型非线性微分方程的振动性，得到了方程振动的几个新的充分条件。

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Based on the Lagrange formula with constants variables, some new sufficient conditions for ensuring globally exponential stability of such systems are derived.

基于拉格朗日常数变易法，给出这类系统全局指数稳定的一个充分条件。

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