  In this article, we introduce a new dielectric function that is different
even from the generalised RPA, first introduced in cond-mat/9810043, in that it
pays attention to fluctuations in the momentum distribution. We argued that
this is important when the momentum distribution is very nonideal. This new
dielectric function reduces to the generalised RPA when the number-fluctuations
are small, and the generalised RPA in turn reduces to the traditional RPA
dielectric function when the momentum distribution is close to ideal.
