# Errata: In Exercise 4.1, x 0 should not be subtracted from time-shifted solution

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Location: page 126, line -5

The printed version of the problem incorrectly shifts the initial condition . The corrected version of the problem should read:

Show that if we have a solution of the differential equation (4.x) given by with initial condition , then is a solution of the differential equation

(Contributed by C. Lepine, 1 Feb 08)