libr12 Subpackage of libint

libr12 computes types integrals that appear in Kutzelnigg’s linear R12 theories for electronic structure. All linear R12 methods, such as MP2-R12, contain terms in the wave function that are linear in the inter-electronic distances r_{ij} (hence the name). Appearance of several types of two-body integrals is due to the use of the approximate resolution of the identity to reduce three- and four-body integrals to products of simpler integrals.

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