The great successes of theory of hyper-geometric series in one variable has stimulated the development of a corresponding theory in two, three , four and more variables. In a series of published papers, we present and study the properties of more than sixty new hyper-geometric functions of four variables. Nevertheless, the question of the possible applications of such functions are still not clear. So I still ask:
What are the possible applications of hyper-geometric functions of four variables in statistic , physics and other fields, if any?