R.K. Nesbet, R. Colle
Physical Review A - AMO
The existence of a ground-state density functional for the kinetic energy of an N-electron system implied the existence of a density-functional derivative equivalent to a local potential function. No conflict was found between standard variational theory in the orbital-functional derivation and formal results of functional analysis. The Hohenberg-Kohn theorems ensured that variational energy was minimized by the ground-state density associated with a given external potential. The results showed that a density-functional derivative does exist for more than two electrons but has the mathematical character of a linear operator that acts on orbital wave functions.
R.K. Nesbet, R. Colle
Physical Review A - AMO
R.K. Nesbet, C.J. Noble, et al.
Physical Review A
J. Barsuhn, R.K. Nesbet
The Journal of Chemical Physics
R.K. Nesbet
International Journal of Quantum Chemistry