We study radially symmetric systems with a repulsive singularity, and show the existence of periodic orbits with small angular momentum. Our proofs are based on the use of topological degree theory.
Submitted February 7, 2014. Published June 6, 2014.
Math Subject Classifications: 34C25.
Key Words: Periodic solutions; singular radially symmetric systems; topological degree theory.
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| Fang-Fang Liao |
Department of Mathematics, College of Science
Hohai University, Nanjing 210098, China
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