"In mathematical harmonic analysis, Harish-Chandra's \u039E function is a special spherical function on a semisimple Lie group, studied by Harish-Chandra (1966,\u2002section 16).Harish-Chandra used it to define Harish-Chandra's Schwartz space.Wallach (1988, 4.5) gives a detailed description of the properties of \u039E."@en .