2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/17606Anderson transition in three-dimensional systems is investigated using renormalization group theory. $β$-function of a very simple form is derived from a self-consistent consideration, and it gives a value $1+1/\sqrt{3}=1.58$ for the critical index of the transition, which is very close to those obtained by numerical studies.8 pages, 1 figureDisordered Systems and Neural NetworksMesoscale and Nanoscale Physicstext