| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 759497 | Communications in Nonlinear Science and Numerical Simulation | 2012 | 22 Pages |
Abstract
⺠We calculate the singular point quantities and period constants. ⺠A constructive theorem of singular point quantities is presented. ⺠We give 23 conditions for the origin of the systems being a center. ⺠We also give a complete classification of conditions for the origin being an isochronous center.
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Authors
Li Feng, Liu Yirong,