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Oscillation criteria for second-order nonlinear delay dynamic equations. (English) Zbl 1125.34046
The authors consider the second-order nonlinear delay dynamic equation $\left(r(t)x^\Delta(t)\right)^\Delta +p(t)f(x(\tau(t))=0$ on a time scale. By employing a generalized Riccati transformation of the form $w(t):= \delta(t)\left[\frac{r(t)x^\Delta(t)}{x(t)} +r(t)a(t)\right],$ they establish some new sufficient conditions which ensure that every solution oscillates or converges to zero. The obtained results improve the well-known oscillation results for dynamic equations and include as special cases the oscillation results for differential equations. Some applications to special time scales $$R, N, q^{N_{0}}$$ with $$q>1$$ and four examples are also included to illustrate the main results.

##### MSC:
 34K11 Oscillation theory of functional-differential equations 39A10 Additive difference equations
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##### References:
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