Author: S. Saker 1
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  • 1 Mansoura University Mathematics Department, Faculty of Science Mansoura 35516 Egypt Mansoura 35516 Egypt
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We present new oscillation criteria for the second order nonlinear neutral delay differential equation [y(t)-py(t-τ)]''+ q(t)yλ(g(t)) sgn y(g(t)) = 0, tt0. Our results solve an open problem posed by James S.W . Wong [24]. The relevance of our results becomes clear due to a carefully selected example.

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