A note on oscillation criteria of second order nonlinear neutral delay differential equations |
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| Authors: | Huizeng Qin Nina Shang Youmin Lu |
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| Affiliation: | aDepartment of Mathematics and Information Technology, Shandong University of Technology, Zibo, Shandong, PR China;bDepartment of Mathematics and Computer Science, Bloomsburg University, Bloomsburg, PA 17815, USA |
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| Abstract: | In recent years, many results on oscillation criteria of second order nonlinear neutral delay differential equations have been obtained, but some of these criteria are incorrect due to a mistake in a crucial auxiliary result. This note examines several of these results, provides some counterexamples and points out what causes the problems. |
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| Keywords: | Oscillation criteria Nonlinear Second order Differential equation Neutral delay |
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