Hohenberg-Kohn 1964 + Kohn-Sham 1965 (Nobel 1998): density-based reformulation; non-interacting reference system + exchange-correlation functional; modern B3LYP / HSE06 / PBE.
Hohenberg-Kohn 1964 + Kohn-Sham 1965 (Nobel 1998): density-based reformulation; non-interacting reference system + exchange-correlation functional; modern B3LYP / HSE06 / PBE.