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DenseHamiltonian + PointGroup -> BlockDiagonalHamiltonian
Project atomic orbital matrices into irreducible representations of point groups to reduce Hamiltonian matrices into smaller, decoupled blocks.
Problem it solves
Dense matrix operations scale cubically, making un-diagonalized large matrices highly inefficient to compute.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.