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13.3. The Kirchhoff–Helmholtz boundary integral

In the previous section we introduced the Green's function
$MathML$
(13.16)
which turns out to be a solution of the following inhomogeneous wave equation:
$MathML$
(13.17)
An important principle in acoustics is that of reciprocity whereby the locations of the sound source r 0 and its observation point r are interchangeable. It can be seen ...

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