Existence of Harmonic Solutions for $n$-Dimensional Li\'{e}nard Equations with Delay
Received:April 30, 2004  Revised:August 13, 2005
Key Words: Li\'{e}nard equations   delay   harmonic solutions   coincidence degree.  
Fund Project:Science and Technology Foundation of CUMT (A200403)
Author NameAffiliation
ZHANG Jian-jun Department of Mathematics, China University of Mining and Technology, Jiangsu 221008, China 
CHEN Tai-yong Department of Mathematics, China University of Mining and Technology, Jiangsu 221008, China 
LIU Wen-bin Department of Mathematics, China University of Mining and Technology, Jiangsu 221008, China 
ZHANG Hui-xing Department of Mathematics, China University of Mining and Technology, Jiangsu 221008, China 
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Abstract:
      In this paper, the existence of harmonic solutions for the $n$-dimensional Li\'{e}nard equations with delay is studied by using coincidence degree theory. Sufficient conditions to guarantee the existence of harmonic solutions for the equation are obtained without restriction on the damping forces and some known results are improved.
Citation:
DOI:10.3770/j.issn:1000-341X.2007.02.021
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