Coordinates in the Relativistic Boltzmann Theory

It is often the case in mathematical analysis that solving an open problem can be facilitated by finding a new set of coordinates which may illumniate the known difficulties. In this article, we illustrate how to derive an assortment coordinates in which to represent the relativistic Boltzmann collision operator. We show the equivalence between some known representations [15, 31], and others which seem to be new. One of these representations has been used recently to solve several open problems in [34, 39, 44, 45].