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If the Airy equation is transformed into a
system of the form (2) in the standard way, setting , we obtain
the linear time-dependent system

The Prüfer transformations are then applied to the Airy equation, as
represented by system (8), equation (6) becomes
Trajectories of this equation are shown in Figure . In the left
half-plane, various funnels and antifunnels are visible, but they do not
give any better information than the Ricccati equation (16).
The solutions on the right of Figure seem to be merging
(far offscreen) as ,
but they are too wiggly for us to be able to find good fences
for a funnel or antifunnel argument.

**Figure 2:** Trajectories for equation for , before balancing.

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**Up:** The Prüfer Transformation
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