#plane-wave_expansion
Plane-wave expansion
Expressing a plane wave as a combination of spherical waves
In physics, the plane-wave expansion expresses a plane wave as a linear combination of spherical waves: wherei is the imaginary unit, k is a wave vector of length k, r is a position vector of length r, jℓ are spherical Bessel functions, Pℓ are Legendre polynomials, and the hat ^ denotes the unit vector.
Sat 26th
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