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Tensor<CartesianIntegral> -> Tensor<SphericalIntegral>
Transform raw computed Gaussian integrals from a Cartesian coordinate representation to a spherical harmonic basis via matrix contraction.
Problem it solves
Cartesian representation contains redundant angular momentum states that must be projected out for efficient quantum chemistry calculations.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.