Necessary and Sufficient Conditions for
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K. Gopalsamy; Lizhi Wen; Yong-Shao Chen; Xue-Zhong He
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Article
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1993
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John Wiley and Sons
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English
β 416 KB
## Abstract Necessary and sufficient conditions for a fourth order functional differential equation of the form (1) [r(t)yβ³(t)]β³+f(t,y(h~1~(t)), y(h~2~(t)), β¦, y(h~n~(t)))=0 to be oscillatory are given when f is strongly superlinear or strongly sublinear.