SphericalHarmonicY[l, m, , ] gives the spherical harmonic .
Mathematical function (see Section A.3.10).
The spherical harmonics are orthogonal with respect to integration over the surface of the unit sphere.
For , where is the associated Legendre function.
For , .
See Section 3.2.9.
See also: LegendreP, ClebschGordan.
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