P. 571, line 21

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Exercise 11.4, number 4 should be:

\alpha = 2, L=20, and

u(x,0) = \left\{\begin{array}{lc}
0, & 0<x\leq 3\\
\sin 2 \pi x, & 3 < x \leq \frac{7}{2} \\
0, & \frac{7}{2} < x \leq 20.
\end{array} \right.

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