We study the existence of periodic solutions for some Hamiltonian systems under new superquadratic conditions which cover the case with . By using the linking theorem, we obtain some new results.
Submitted September 20, 2001. Published Janaury 15, 2002.
Math Subject Classifications: 58E05, 58F05, 34C25.
Key Words: periodic solution, Hamiltonian system, linking theorem.
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|Guihua Fei |
Department of Mathematics and statistics
University of Minnesota
Duluth, MN 55812, USA
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