• March 17th 2009, 10:52 AM
Hello,

I have a phase portrait that is supposed to contain a saddle and a node, only problem is i can only see the saddle which is at about 0.25. Could someone point out where the node is? I know the pictures not that great and if you want another view just say.
Thanks
• March 17th 2009, 10:59 AM
Showcase_22
Can you post the equation that you're using?

I'm eager to find this ellusive node, it's just that I want to see if I can work it out algebraically so I know where to look.
• March 17th 2009, 12:25 PM
Here's the equation $u'(t) = -au + v, v'(t) = \frac{1}{1+u^2} - v$