How can I construct the phase portrait(with Mathematica) of the following system?(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\dot{x}(t)=y(t)[/tex]

[tex]\dot{y}(t)=-x^3(t)+4x(t)y(t)[/tex]

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Phase portrait

**Physics Forums | Science Articles, Homework Help, Discussion**