Sent to CCL by: "bonoit bonoit" [bonoit_10__yahoo.fr] Dear CCLers, I'm writing to enquire about the exchange term (Kij) in the Hartree-Fock method. My question is as follow: How c'd the exchange term reduce the energy in HF method? And what c'd be the difference between this term and the coulombian one in the same method HF? Thank you in advance Sincerely, Bonoit