\(QS27_{1}^{(2)}\)
Description
Phase Portrait
Topological Invariants
| TCSP | Fin Sep | Inf Sep |
|---|---|---|
| \(27\) | \(40\) | \(2211\) |
Example
The quadratic differential system
\[\begin{cases} \dot{x} = (cm \, x^{2})/10 - y + 2 \, ch \, x \, y \\ \dot{y} = x + (-2 \, ch + cl) \, x^{2} + (-cg + cm/10) \, x \, y + 2 \, ch \, y^{2} \end{cases}\]
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 \(BD02\) in {J. C. Artés}, Systems of class BD, {Preprint} (2026).
- With name \(7S06\) in Missing reference in QWF1SN02
- With name \(5.7L2\) 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
- With name \(2.7L18\) in {J. C. Artés, A. C. Rezende and R. D. S. Oliveira}, The geometry of quadratic polynomial differential systems with a finite and an infinite saddle-node (C), emph{Internat. J. Bifur. Chaos Appl. Sci. Engrg.}, textbf{25}, no. 3 (2015), 1530009, 111 pp.