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Oscillation of second order delay and ordinary differential equation. (English) Zbl 0543.34054
Two oscillation criteria are given for the equation \(u''(t)+p(t)u(h(t))=0,\) where p(t)\(\geq 0\), h(t)\(\leq t\) and h(t)\(\to \infty\) as \(t\to \infty\). For \(h(t)=t\) the first criterion seems to be already known.
Reviewer: M.M.Konstantinov

34K99 Functional-differential equations (including equations with delayed, advanced or state-dependent argument)
34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations
Full Text: EuDML
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