On the additivity and interference of interactions
I. Mayer · International Journal of Quantum Chemistry · 1992
There is a very simple criterion showing whether two (or more) Hamiltonians describe strictly additive effects. Based on this criterion, an attempt is made to develop techniques that would permit treatment of different not strictly additive interactions by separating out their components, which can be considered strictly additive, and describing the nonadditive (interference) effects as some perturbation. As a first result, a promising scheme has been developed for estimating matrix eigenvalues by an ∼ N2 procedure. © 1992 John Wiley & Sons, Inc.