| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1890994 | Chaos, Solitons & Fractals | 2007 | 6 Pages |
Abstract
As we know, Bautin proved that a focus of a quadratic system has order at most 3. We give a new and simple proof to this well-known result by using an elementary method. We also use the elementary method to give a necessary and sufficient condition for a quadratic system to have a center.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Statistical and Nonlinear Physics
Authors
Maoan Han, Hong Zang, Tonghua Zhang,