Abstract
We present optimal formulae for two-center two-electron replusion integrals (ERIs) over Cartesian Gaussian basis functions. Floating-point operations (flop) counts reveal that two-center ERIs are often an order of magnitude cheaper than their four-center analogues. © 2000 John Wiley & Sons, Inc. J Comput Chem 21: 1505–1510, 2000
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