We consider a certain second-order nonlinear delay differential equation and prove that the all solutions oscillate when proper impulse controls are imposed. An example is given. (c) 2006 Elsevier Ltd. All rights reserved.
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City Univ Hong Kong, Chinney Investments Ltd, Room 814,Swire House, Hong Kong, Peoples R ChinaCity Univ Hong Kong, Chinney Investments Ltd, Room 814,Swire House, Hong Kong, Peoples R China