. Hence, By definition of ?, it even suffices to see that t ell,reg (F ) G ? p(F ) = ?. But this follows immediately from the fact that P being proper

R. Harish-chandrak and ]. A. Kret, Harmonic analysis on reductive p-adic groups. Notes by G. van Dijk Existence of cuspidal representations of p-adic reductive groups, Lecture Notes in Mathematics, vol.162, 1970.

V. Platonov and A. Rapinchuk, Algebraic groups and number theory Translated from the 1991 Russian original by Rachel Rowen Représentations des groupes réductifs p-adiques Cours Spécialisés [Specialized Courses, Pure and Applied Mathematics, 1994.