摘要
The existence conditions of an invariant torus for general planar periodic perturbed systems are given.It is proved that the perturbed systems may have not only large invariant tori which appear in pair,but also small invariant tori.
The existence conditions of an invariant torus for general planar periodic perturbed systems are given.It is proved that the perturbed systems may have not only large invariant tori which appear in pair,but also small invariant tori.
基金
Project supported by the National Natural Science Foundation of China.
