Errata: Sign error in equation (8.17) - (sI - A) should be (A - sI)

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Location: page 240, line -16, -13

There is a sign error in equation (8.17) and the displayed equation above it. To match the equations for a zero, the proper matrix in both places is

math

(Contributed by R. M. Murray, 14 Aug 08)

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