Scrap
\($\displaystyle\sum\limits_{a < b} \langle \delta^3 ({\bf r_{ab}}) \rangle $\)
\(\varepsilon_{\infty}^{(5)}(log)\)
\(\varepsilon_{\infty}^{(5)}(nlog)\)
\(\frac{Z^3}{\pi n^3}\)
\($\displaystyle\sum\limits_{a} \langle \delta^3 ({\bf r_{a}}) \rangle $\)
