The objective of this paper is to study oscillation of fourth-order neutral differential equation. By using Riccati substitution and comparison technique, new oscillation conditions are obtained which insure that all solutions of the studied equation are oscillatory. Our results complement some known results for neutral differential equations. An illustrative example is included.

中文翻译：

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四阶非线性中立时滞微分方程：解的振动性

本文的目的是研究四阶中立型微分方程的振动性。通过使用Riccati替换和比较技术，获得了新的振荡条件，从而确保了所研究方程的所有解都是振动的。我们的结果补充了中立型微分方程的一些已知结果。包括说明性示例。