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Hille and Nehari type criteria for third-order dynamic equations. (English) Zbl 1128.39009
For the third order dynamic equation on an arbitrary time scale $T$ with $\sup T=\infty$, $$x^{\Delta\Delta\Delta}(t)+p(t)x(t)=0 \eqno{(1)}$$ where $p(t)$ is a positive real-valued rd-continuous function defined on $T$, the authors consider its oscillatory properties. Several sufficient conditions are obtained for oscillation of all solutions of (1). The results given in this paper extend those established by {\it E. Hille} [Trans. Am. Math. Soc. 64, 234--252 (1948; Zbl 0031.35402)] and {\it Z. Nehari} [Trans. Am. Math. Soc. 85, 428--445 (1957; Zbl 0078.07602)] for second order differential equations. The oscillation criteria for (1) are new even for third order differential equations and the corresponding difference equations. Several examples illustrating the results are also given.

##### MSC:
 39A12 Discrete version of topics in analysis 34C10 Qualitative theory of oscillations of ODE: zeros, disconjugacy and comparison theory 39A11 Stability of difference equations (MSC2000)
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##### References:
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