\(QS11_{9}^{(2)}\)

Description

Topological configuration of singularities: \(s,s,a,a;N,(0,2)SN\)

Phase Portrait

Phase Portrait Graphic Design

Topological Invariants

TCSPFin SepInf Sep
\(11\)\(4420\)\(4211\)

Example

The quadratic differential system

\[\begin{cases} \dot{x} = ce + x^{2} + 2 \, ch \, x \, y + (9 - 2 \, ch) \, y^{2} \\ \dot{y} = 5 \, x^{2} + y + (-18 + 2 \, ch) \, x \, y + (5 + 2 \, (9 - 2 \, ch) + 2 \, ch) \, y^{2} \end{cases}\]

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