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

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Location: page 132, line -5

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

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

math

with initial condition math.