\(QS27_{4}^{(2)}\)
Description
Phase Portrait
Topological Invariants
| TCSP | Fin Sep | Inf Sep |
|---|---|---|
| \(27\) | \(40\) | \(3120\) |
Example
The quadratic differential system
\[\begin{cases} \dot{x} = ce + x^{2} + 2 \, ch \, x \, y + (9 - 2 \, ch) \, y^{2} \\ \dot{y} = 4 \, x^{2} + y + 2 \, (-8 + ch) \, x \, y + (22 - 2 \, ch) \, y^{2} \end{cases}\]
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 \(BD05\) in {J. C. Artés}, Systems of class BD, {Preprint} (2026).