Dunkl intertwining operator for symmetric groups

Abstract

In this note, we express explicitly the Dunkl kernel and generalized Bessel functions of type $A_{n-1}$ by the Humbert's function ${\Phi }_2^{(n)}$, with one variable specified. The obtained formulas lead to a new proof of Xu's integral expression for the intertwining operator associated to symmetric groups, which was recently reported in [21].

Minor revision, remarks added. Comments welcome!