If the eigenvalues from a linearized system of non-linear differential equations indicate a fixed point at the origin is an unstable spiral, yet the non-linearized system shows that a limit cycle exists at the circle r=1, do we still classify the origin as an unstable spiral even though it approaches the limit cycle?   In other words, does an unstable spiral have to approach infinity as time increases?  Or can we say an unstable spiral approaches a limit cycle? I'm wondering how do we classify the stability of the origin when a limit cycle exists?  Hope this makes sense.

Elementary Linear Algebra (MindTap Course List)
8th Edition
ISBN:9781305658004
Author:Ron Larson
Publisher:Ron Larson
Chapter7: Eigenvalues And Eigenvectors
Section7.1: Eigenvalues And Eigenvectors
Problem 65E
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If the eigenvalues from a linearized system of non-linear differential equations indicate a fixed point at the origin is an unstable spiral, yet the non-linearized system shows that a limit cycle exists at the circle r=1, do we still classify the origin as an unstable spiral even though it approaches the limit cycle?  

In other words, does an unstable spiral have to approach infinity as time increases?  Or can we say an unstable spiral approaches a limit cycle?

I'm wondering how do we classify the stability of the origin when a limit cycle exists?  Hope this makes sense.

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