APM346--2020S > Chapter 4

4.1 typos

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**Yan Zhou**:

The solutions to equation (11) should be $k_{1,2} = \pm \frac{\pi n}{l}i$. There is a missing sign of $\pm$.

In the second term of equation (13), $B_{n}sin(\frac{c\pi nt}{l})$ has an extra letter A.

**Victor Ivrii**:

You seem to have a different texbook than posted

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