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WW7 - related to problem 7

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**Sarah Dunning**:

What is a vertical (x-)nullcline equation and how do you find it?

What is a horizontal (y-)nullcline equation and how do you find it?

Using the nullclines how do you estimate trajectories in the phase plane?

**Victor Ivrii**:

From context: $x'=0$ or $y'=0$ respectively.

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