2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/60360We give a concise proof of a classification of lens spaces up to orientation-preserving homeomorphisms. The chief ingredient in our proof is a study of the Alexander polynomial of ` symmetric' links in $S^3$.LaTeX, 4 pages with 1 figureGeometric Topology57M27 (Primary) 57M25 (Secondary)text