摘要
In this paper, we prove that the cycicity of period annulns (or annuli) of certain generic quadratic Hamiltonian systems under quadratic perturbations is two. Some methods and a part of results in this paper are new.
In this paper, we prove that the cycicity of period annulns (or annuli) of certain generic quadratic Hamiltonian systems under quadratic perturbations is two. Some methods and a part of results in this paper are new.
基金
Supported by NSFC and RFDP.