\(QS7_{11}^{(2)}\)

Description

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

Phase Portrait

Phase Portrait Graphic Design

Topological Invariants

TCSPFin SepInf Sep
\(7\)\(4310\)\(3111\)

Example

The quadratic differential system

\[\begin{cases} \dot{x} = ce \, x + x^{2} + 2 \, ch \, x \, y + (-2 - 2 \, ch) \, y^{2} \\ \dot{y} = cl \, x^{2} + y + (3 + 2 \, ch - 2 \, cl) \, x \, y + (2 \, (-2 - 2 \, ch) + 2 \, ch + cl) \, y^{2} \end{cases}\]

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