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 th...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.展开更多
文摘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.
