Chapter 44
1 Note to the instructor: Contrary to the usual “one lecture, one chapter” policy followed in this book, this particular chapter is supposed to be covered in two lectures.
2 Not even perfectly right, a physicist may remark!
3 or, the IBVP, as some people may prefer to call it
4 If we had started with the complete wave equation utt = c2Δ2u, then at this stage we would obtain the complete Helmholtz equation Δ2F + λ2F = 0. Subsequent application of 
would then yield Eqn. 44.23.
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