Draw phase protrait, the direction

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SUMMARY

The discussion focuses on determining the types of equilibria for the system of differential equations defined by x' = y - x and y' = (x - 1)(y - 2). The equilibria found include a sink at (1,1) with eigenvalues (-1 ± sqrt(3))/2 and a saddle at (2,2). The participants confirm that the direction of trajectories can be assessed by evaluating the system at specific points, such as (1,2), where the direction is determined to be clockwise. Additionally, it is emphasized that eigenvectors are necessary for accurately depicting the saddle point in graphical representations.

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Homework Statement



x' = y-x
y' = (x-1)(y-2)

Determin the the type of equilibriums


Homework Equations




I have found the equilibriums and that one of them is a sink.
Eigenvalues (-1 +- sqrt(3))/2 with centre (1,1)

Now can I just determin the direction by looking at (1,2), where x' = 2 and y' = 0 and say ot goes clockwise?

Next question: I got two equilibrium points the sexond is in (2,2) and is a saddle.
Are there any rule for how I should draw two equilibrium points? I mean they are very close.
 
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MaxManus said:
Now can I just determin the direction by looking at (1,2), where x' = 2 and y' = 0 and say ot goes clockwise?

Yes, this is fine.

MaxManus said:
Next question: I got two equilibrium points the sexond is in (2,2) and is a saddle.
Are there any rule for how I should draw two equilibrium points? I mean they are very close.

Close is of course relative to how far you draw them apart. Anyway, keep in mind that to draw the saddle properly you will need to know the eigenvectors as well.
 
Thanks
 

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