2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148403We give a dual to the McKay correspondence, involving conjugacy classes of subgroups of SU(2). We prove a determinantal formula involving both correspondences. We pose some questions concerning a non-commutative Fourier transform.revised version, correcting misprints and incorporating Comments by Dolgachev and McKay, plus reference to Bourbaki's tables plain texAlgebraic Geometry14J17 (Primary) 20C15 (Secondary) 20F34 (Secondary)text