Abstract
In this paper, some new oscillation criteria are obtained for the first order nonlinear delay dierential equation x 0 ðt Þþ pðtÞ f ðxðtt1Þ; ... ; xðttmÞÞ ¼ 0 and the corresponding advanced dierential equation. Our results improve the known results in the literature. And an example is given to demonstrate the advantage of our results.
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