2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/194852We present the main features of the physics of extremal black holes embedded in supersymmetric theories of gravitation, with a detailed analysis of the attractor mechanism for BPS and non-BPS black-hole solutions in four dimensions.Typos corrected, some points clarifiedHigh Energy Physics - Theorytext