\(QS7_{5}^{(2)}\)
Description
Phase Portrait
Topological Invariants
| TCSP | Fin Sep | Inf Sep |
|---|---|---|
| \(7\) | \(4221\) | \(2111\) |
Example
The quadratic differential system
\[\begin{cases} \dot{x} = -x + x^{2} - (19 \, x \, y)/100 \\ \dot{y} = x^\frac{2}{10} + y + (4 \, x \, y)/5 - (9 \, y^{2})/100 \end{cases}\]
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 \(BD21\) in {J. C. Artés}, Systems of class BD, {Preprint} (2026).