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Electron repulsion integral (ERI) evaluator.
Implements the Obara-Saika recurrence for two-electron integrals over Cartesian Gaussian shells. For HF-3c, we need up to (pp|pp).
Electron repulsion integral (ERI) evaluator.
Implements the Obara-Saika recurrence for two-electron integrals over Cartesian Gaussian shells. For HF-3c, we need up to (pp|pp).