In dealing with Poisson, Laplace, Schrodinger and other wave equations, one has to deal with propagating and evanescent waves. We know all about the propagating waves - orthogonality and completeness relations, but what about evanescent waves? Do they form a vector space with corresponding identities?(adsbygoogle = window.adsbygoogle || []).push({});

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# Do evanescent waves span a vector space?

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