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Support X2C1e for GHF/GKS and implement Density Fitting for GHF/GKS#569

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puzhichen wants to merge 16 commits intopyscf:masterfrom
bytedance:feat/ghf-x2c-df
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Support X2C1e for GHF/GKS and implement Density Fitting for GHF/GKS#569
puzhichen wants to merge 16 commits intopyscf:masterfrom
bytedance:feat/ghf-x2c-df

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This pull request implements two major enhancements:

  1. X2C1e Support:

    • Extended GHF and GKS solvers to support the X2C1e Hamiltonian using spin orbital basis.
    • Ensures consistent results with the CPU implementation in PySCF.
  2. Density Fitting (DF):

    • Implemented density fitting for GHF and GKS.

@puzhichen puzhichen marked this pull request as ready for review November 24, 2025 08:53
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