2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41219We describe a mechanism for using discrete symmetries to solve the doublet-triplet splitting problem of four-dimensional supersymmetric GUT's. We present two versions of the mechanism, one via ``deconstruction,'' and one in terms of M-theory compactification to four dimensions on a manifold of G_2 holonomy.21 pp, additional referencesHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext