2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51324The origins of the 11-dimensional supermembrane are recalled, and a curious property is discussed: the field theory limit of a supermembrane in a hyper-Kähler background is a 3-dimensional sigma-model with N=4 supersymmetry, but the higher-order fermion interactions of the supermembrane generically break this to N=3.10 pp, Contribution to Stephen Hawking's 60th birthday conferenceHigh Energy Physics - Theorytext