MAT244-2014F > Quiz 4

Q4 problem 2

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**Yuan Bian**:

Q2: 7.6 #6

r2+9=0

r1=3i, r2=-3i

pure imaginary eigenvalue, so it's stable center

also whole soln is in the q1 fisrt post.

**Guang_Yang**:

7.6 #6

**Tao Hu**:

How to determine the direction of the circular phase portrait? What is the difference between clockwise and anti-clockwise? :o

**Yuan Bian**:

from prof Victor Ivrii : "Why you just don't learn a very simple criteria for the center or focus: if the top-right element of 2Ã—2 matrix is >0 the orientation is clock-wise; otherwise it is counter-clock-wise."

**Shuyang Wang**:

Just a plot by software

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