deletions | additions       diff --git a/XC Functionals.tex b/XC Functionals.tex  index 4fc092f..1e94865 100644  --- a/XC Functionals.tex  +++ b/XC Functionals.tex 
...
\section{Development of exchange and correlation functionals}  %Micael, Miguel, Xavier  The central quantity of the KS scheme of DFT is the exchange  and correlation (xc) xc  energy $E_{\rm xc}[n]$ that describes all non-trivial many-body effects. Clearly, the exact form of this  quantity is unknown and it must be approximated in any practical  application of DFT. We emphasize that the precision of any DFT