Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
844099 | Nonlinear Analysis: Theory, Methods & Applications | 2008 | 20 Pages |
Abstract
We characterize the center variety and the maximum order of any focus of the 6-parameter family of real planar polynomial vectors given, in complex notation, by zÌ=iz+Azn1zÌj1+Bzn2zÌj2+Czn3zÌj3, where A,B,CâCâ{0}, (n1,j1)â (n2,j2)â (n3,j3), nk+jk>1 for k=1,2,3n1+j1=n2+j2=n3+j3, |1ân3+j3|=|1ân2+j2|â |1ân1+j1| and (1ân1+j1)(1ân2+j2)â 0.
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Authors
Clà udia Valls,