2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/205533We describe higher-dimensional theories whose low-energy 4D descriptions contain larger gauge or global symmetry groups. As an example, we construct a Higgsless SU(2) x U(1) model of electroweak symmetry breaking. The 5D SU(2) gauge invariance contains both the weak SU(2) gauge group and a custodial symmetry that protects the rho parameter. Fermions obtain isospin-violating masses while maintaining universal gauge couplings among all three generations. As a further example, we construct a model of chiral color based on a single SU(3).4 pages, 1 eps figure, RevTeX4High Energy Physics - PhenomenologyHigh Energy Physics - Theorytext