Appendix: Applying a result of Roblin to get equidistribution on the boundary
Résumé
The purpose of this appendix is to show how one can recover a result in the spirit of Lim and Oh from a theorem of Roblin. The following is part of the author's PhD thesis T12U, with some minor modifications, and some of these ideas have also been used in T9U, but in the case of lattices in higher rank Lie groups.