2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170840In this survey article we give an overview of the developments on the congruence subgroup and the metaplectic problems after the work of Bass, Milnor and Serre.22 pagesNumber Theory20G30Developments on the congruence subgroup problem after the work of Bass, Milnor and Serretext