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
with initial condition
.
(Contributed by C. Lepine, 1 Feb 08)
