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《Journal of Anhui Normal University(Natural Science)》 2002-02
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OSCILLATION FOR DELAY DIFFERENTIED EQUATIONS OF SECOND ORDER

XIANG Ming yin 2, XU Zhi ting 2 (1.Department of Mathematics,Huangshan Senior College,Huangshan 245021, China;2.Department of Applied Mathematics,Guangdong University of Technology,Guangzhou 510090, China)  
This paper makes use of the skill on the function average,improves delay differential equations of second order of oscillation theorems in some theses,and some new oscillation theorems for delay differential equations of second order are established.
【CateGory Index】: O175.25
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