ABSTRACT
The Hartree and the Hartree-Fock approximations have the characteristic feature that A has the form A ( p , ω ) = 2 π δ ( ω − E ( p ) ) https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429493218/2723bf93-af84-4d1d-955c-798a77ad6aa2/content/eq137.tif"/>
