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.

For the same fundamental reasons, also appears when calculating the Schrodinger equation solution for the hydrogen atom.

- 2D wave equation on a circular domain | 0, 106, 2
- Wave equation | 68, 191, 4
- Important partial differential equations | 41, 537, 13
- Partial differential equation | 0, 537, 14
- Differential equation | 0, 2k, 48
- Calculus | 11, 4k, 96
- Mathematics | 17, 10k, 239
- Ciro Santilli's Homepage | 238, 147k, 2k