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.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter2: Systems Of Linear Equations
Section2.4: Applications
Problem 15EQ
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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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