\(QS10_{11}^{(0)}\)
Description
Phase Portrait
Topological Invariants
| TCSP | Fin Sep | Inf Sep |
|---|---|---|
| \(10\) | \(4411\) | \(221221\) |
Example
The quadratic differential system
\[\begin{cases} \dot{x} = -y+x^{2}-2 \, x \, y \\ \dot{y} = e^{2} \, x/5-e \, y+(-1+e+e^{2}/5) \, x^{2}+2 \, (1-e) \, x \, y-y^{2} \end{cases}\]
with parameters: \(e = 0.3\)
has the following phase portrait done with P4. If you want, you may download the P4 file here. Since the image is not clear enough, we have added a ZOOM of it.
The phase portrait appears in the following papers
- With name \(Fig 5.207 S^2_{10,11}\) in {J. C. Artés, J. Llibre and A. C. Rezende}, Structurally unstable quadratic vector fields of codimension one, Birkhäuser/Springer, Cham, 2018, vi+267 pp.Note (for name \(Fig 5.207 S^2_{10,11}\)): The system has limit cycles with distribution \((1,0)\).
- With name \(S^2_{10,11}\) in {J. C. Artés, R. E. Kooij and J. Llibre}, Structurally stable quadratic vector fields, Mem. Amer. Math. Soc. { bf 134} (1998), no.~639, viii+108 pp.; MR1432139
Neighbours of Codimension 1
- Through the border \(QS11_{13}^{(1)}\), by means of a bifurcation of type \(B\), we reach the neighbor \(QS8_{3}^{(0)}\).
- Through the border \(QS38_{23}^{(1)}\), by means of a bifurcation of type \(A\), we reach the neighbor \(QS25_{2}^{(0)}\).
- Through the border \(QS10_{13}^{(1)}\), by means of a bifurcation of type \(D\), we reach the neighbor \(QS10_{4}^{(0)}\).
- Through the border \(QS10_{17}^{(1)}\), by means of a bifurcation of type \(D\), we reach the neighbor \(QS10_{9}^{(0)}\).