Abstract
We present conditions for the origin to be a centre for a class
of cubic systems. Some of the centre conditions are determined by finding
complicated invariant functions. We also investigate the coexistence of fine
foci and the simultaneous bifurcation of limit cycles from them.
| Original language | English |
|---|---|
| Article number | 119 |
| Pages (from-to) | 1-23 |
| Number of pages | 23 |
| Journal | Electronic Journal of Differential Equations |
| Volume | 2007 |
| Publication status | Published - 2007 |