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Sufficient conditions for a Cauchy function and its derivatives to be positive for a differential equation with a lagging argument

โœ Scribed by Yu. V. Komlenko

Publisher
SP MAIK Nauka/Interperiodica
Year
1980
Tongue
English
Weight
556 KB
Volume
20
Category
Article
ISSN
0037-4466

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Necessary and Sufficient Conditions for
Necessary and Sufficient Conditions for a Fourth Order Functional Differential Equation to be Oscillatory
โœ K. Gopalsamy; Lizhi Wen; Yong-Shao Chen; Xue-Zhong He ๐Ÿ“‚ Article ๐Ÿ“… 1993 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 416 KB

## Abstract Necessary and sufficient conditions for a fourth order functional differential equation of the form (1) [r(t)yโ€ณ(t)]โ€ณ+f(t,y(h~1~(t)), y(h~2~(t)), โ€ฆ, y(h~n~(t)))=0 to be oscillatory are given when f is strongly superlinear or strongly sublinear.