Spherical Harmonic Tensor
A tensor defined in terms of the tensors which satisfy the double contraction relation.
See also
Double Contraction Relation, Spherical HarmonicExplore with Wolfram|Alpha
WolframAlpha
More things to try:
Cite this as:
Weisstein, Eric W. "Spherical Harmonic Tensor." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/SphericalHarmonicTensor.html