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What does it mean for a solution to a system of differential equations to be fragile?

A context for the term can be found here: enter image description here

This is taken from here in Mathematical Methods for Mechanics: A Handbook With MATLAB Experiments by Eckart Gekeler.

Does it mean it is small perturbations grow over time?

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@ZevChonoles: Thanks for adding the page! – Student Apr 4 '12 at 19:00
No problem, glad to help! – Zev Chonoles Apr 4 '12 at 19:03
What is $\mu$? $ $ – draks ... Apr 4 '12 at 21:26
@draks: It is just a measure of mass. – Student Apr 4 '12 at 22:06

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