By means of variational structure and critical point theory, we study the existence of periodic solutions for a second-order neutral differential equation
where is a given positive integer and is a positive number.
Submitted January 6, 2005. Published March 6, 2005.
Math Subject Classifications: 34K13, 34K40, 65K10.
Key Words: Neutral differential equations; periodic solution; variational method; critical point.
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| Yongjin Li |
Department of Mathematics
Sun Yat-sen University
Guangzhou, 510275, China
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