2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52713We give a simple introduction to ordinary and conformal supergravity, and write their actions as squares of curvatures.Contribution to ``50 Years of Yang-Mills Theory'', World Pub. Co., G. `t Hooft editor, LaTex, pp. 29High Energy Physics - Theorytext