BOUNDED OSCILLATION FOR SECOND-ORDER NONLINEAR DELAY DIFFERENTIAL EQUATIONS†

@article{Song2014BOUNDEDOF,
  title={BOUNDED OSCILLATION FOR SECOND-ORDER NONLINEAR DELAY DIFFERENTIAL EQUATIONS†},
  author={Xia Song and Quanxin Zhang},
  journal={Journal of applied mathematics \& informatics},
  year={2014},
  volume={32},
  pages={447-454}
}
Two necessary and sufficient conditions for the oscillation of the bounded solutions of the second-order nonlinear delay differential equation ( a(t)x′(t) )′ + q(t)f(x[τ(t)]) = 0 are obtained by constructing the sequence of functions and using inequality technique. AMS Mathematics Subject Classification: 34C10. 
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