2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55951We give a description of supermembranes in nontrivial target-space geometries. A special class are the $AdS_4\times S^7$ and $AdS_7\times S^4$ spaces that have the maximal number of 32 supersymmetries.Lecture presented at the 22-nd Johns Hopkins Workshop, Novelties in String Theory, Göteborg, August 20-22, 1998. LateX 18 ppHigh Energy Physics - Theorytext