Ciro Santilli
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Shows up when trying to solve 2D wave equation on a circular domain in spherical coordinates with separation of variables, where we have to decompose the initial condition in termes of a fourier-Bessel series, exactly like the Fourier series appears when solving the wave equation in linear coordinates.
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For the same fundamental reasons, also appears when calculating the Schrodinger equation solution for the hydrogen atom.
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Ancestors

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