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**Quiz-7 / Re: Q7 TUT 0301**

« **on:**November 30, 2018, 06:34:02 PM »

c) For the first critical point(s), the eigenvalues are $\pm i$. This means the phaseportrait is centre (CW).Hi Michael, I think you should mention that phase portrait is counterclockwise for the first matrix since -1<0 rather than imaginary eigenvalues

From Prof. Ivrii's post: http://forum.math.toronto.edu/index.php?topic=1525.0

Given the matrix of the first critical point, b = 1, c = -1, and it seems the link above says, b >0, c<0 => clockwise?