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Part 2. 3D Green's function for the Helmholtz (wave equation) operator

[Click here for a PDF version of this post] This is a continuation of yesterday’s post on wave function Green’s functions. We derived the 1D Green’s function, now it’s time for the 3D. Next up after this will be the 2D Green’s function, which looks harder to evaluate than the 1D or 3D versions. 3D Green’s function. The 3D Green’s function that we wish to try to evaluate…