\(QS27_{5}^{(2)}\)
Description
Phase Portrait
Topological Invariants
| TCSP | Fin Sep | Inf Sep |
|---|---|---|
| \(27\) | \(42\) | \(2110\) |
Example
The quadratic differential system
\[\begin{cases} \dot{x} = 2 \, x \, y \\ \dot{y} = x^{2} + y + 2 \, x \, y + cn \, y^{2} \end{cases}\]
has the following phase portrait done with P4. If you want, you may download the P4 file here.
The phase portrait appears in the following papers
- With name \(BD06\) in {J. C. Artés}, Systems of class BD, {Preprint} (2026).
- With name \(4.5L1\) in {J. C. Artés, R. D. S. Oliveira and A. C. Rezende}, Topological classification of quadratic polynomial differential systems with a finite semi-elemental triple saddle, Internat. J. Bifur. Chaos Appl. Sci. Engrg. { bf 26} (2016), no.~11, 1650188, 26 pp.; MR3566296