Abstract
A local Kohn-Sham potential can be constructed explicitly either in the "exchange-only" density-functional theory of Talman, which does not constrain the density to its Hartree-Fock value, or in the "Hartree-Fock" density-functional theory of von Barth, which does. The Kohn-Sham orbital energies are essentially the same by either choice, as shown here for the beryllium atom. Our conclusion still stands that the exact Kohn-Sham orbital energies for tightly bound electrons are not physical removal energies.
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