Clearly, this directs attention to the functional, which now contains the costs involved with the many-electron problem.
\subsection{Approximations for exchange and correlation}
\label{subsection:ldagga}
As discussed above, the HK and KS formulations are exact and so far no approximations except the adiabatic approximation entered the theory.
Clearly, this directs attention to the functional, which now contains the costs involved with the many-electron problem.
\subsection{Approximations for exchange and correlation}
\label{subsection:ldagga}
As discussed above, the HK and KS formulations are exact and so far no approximations except the adiabatic approximation entered the theory.