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Unformatted text preview: steps: (1) Draw lines through the origin determined by a and b . (2) Along these lines, draw arrows going towards the origin if < 0, and away from the origin if > 0. (3) Using the relations A a = a b A b = a + b spiral from b to a if / < 0, and from a to b if / > 0. If is positive, we say that the direction eld is a nodal spiral . If is negative, we say that the direction eld is a spiral sink . 1...
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- Spring '09