In this paper, the oscillation criteria for solutions of the neutral delay differential equation (NDDE) \[ \left( {y(t)-p(t)\, y({t-\tau } )} \right)^{(n )}+ \alpha \,Q(t)\,\,G\left( {y({t-\sigma })} \right)= f(t) \] has been studied where $p(t) = 1$ or $p(t) \le 0$, $\alpha =\pm 1$, $Q\in C \left([0, \infty ), R^{+}\right)$, $f \in C([0, \infty ), R)$, $G \in C(R, R)$. This work improves and generalizes some recent results and answer some questions that are raised in [1].
@article{107920, author = {Radhanath N. Rath and Laxmi N. Padhy and Niyati Misra}, title = {Oscillation of solutions of non-linear neutral delay differential equations of higher order for $p(t)=\pm 1$}, journal = {Archivum Mathematicum}, volume = {040}, year = {2004}, pages = {359-366}, zbl = {1116.34332}, mrnumber = {2129958}, language = {en}, url = {http://dml.mathdoc.fr/item/107920} }
Rath, Radhanath N.; Padhy, Laxmi N.; Misra, Niyati. Oscillation of solutions of non-linear neutral delay differential equations of higher order for $p(t)=\pm 1$. Archivum Mathematicum, Tome 040 (2004) pp. 359-366. http://gdmltest.u-ga.fr/item/107920/
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