Hello, I'm considering the system:(adsbygoogle = window.adsbygoogle || []).push({});

dx/dt=y-x

dy/dt=x-y

I've found the fixed points and shown that this is a first integral of the system:

f(x,y)=x+y

How can I (using this information only) sketch a phase portrait? I know the graph of fixed points looks like the x=y graph, but im not sure how this relates to a phase portrait.

Any help? Thanks.

**Physics Forums - The Fusion of Science and Community**

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

# Phase Portrait Question

Loading...

Similar Threads - Phase Portrait Question | Date |
---|---|

B Function rules question | Saturday at 9:49 AM |

I Integral with complex oscillating phase | Nov 16, 2016 |

I Gaussian integration for complex phase | Oct 17, 2016 |

A FFT phase result interpretation? | May 30, 2016 |

Doubt on phase stationary method | Feb 18, 2016 |

**Physics Forums - The Fusion of Science and Community**