Errata: In Example 4.13, inequality should be for x 1 instead of x 2
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Location: page 121, line 10
In Example 4.13, the sentence defining the invariant sets for the stabilized inverted pendulum should read:
Hence
foranysuch that
and
will be inside the invariant set defined by the level curves of
.
(Contributed by S. Livingston, 28 Feb 2011)
such that 

and
will be inside the invariant set defined by the level curves of
.