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Necessary and sufficient conditions for determining a Hill's equation from its spectrum

✍ Scribed by Wallace Goldberg

Publisher: Elsevier Science
Year: 1976
Tongue: English
Weight: 226 KB
Volume: 55
Category: Article
ISSN: 0022-247X
DOI: 10.1016/0022-247x(76)90063-9

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