\(QS7_{12}^{(2)}\)
Description
Phase Portrait
Topological Invariants
| TCSP | Fin Sep | Inf Sep |
|---|---|---|
| \(7\) | \(4220\) | \(2121\) |
Example
The quadratic differential system
\[\begin{cases} \dot{x} = ce \, x + x^{2} + 2 \, ch \, x \, y + (-19/100 - 2 \, ch) \, y^{2} \\ \dot{y} = (14 \, x^{2})/125 + y + 2 \, (483/1000 + ch) \, x \, y + (-67/250 - 2 \, ch) \, y^{2} \end{cases}\]
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 \(BD28\) in {J. C. Artés}, Systems of class BD, {Preprint} (2026).