2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/66543We show that PSL(2,Z[1/p]) admits a combing with bounded asynchronous width, and use this combing to show that PSL(2,Z[1/p]) has an exponential Dehn function. As a corollary, PSL(2,Z[1/p]) has solvable word problem and is not an automatic group.16 pagesGroup Theorytext