2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/116840A generic heterotic string theory is uniquely reduced to the standard model in terms of a geometry that transcends compactification. This device also extends the standard model to embrace three generations of fermions, including a left-handed strange quark that is devoid of strangeness and three right-handed neutrinos. Finally the proposed hypothesis indicates supergravitationally mediated quark-lepton transitions that preserve baryon structure, departing from the SUSY GUT tradition that predicts proton decay.7 pages, no figuresGeneral Physicstext