2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49968Field theories that describe {\sl small} fluctuations of branes are limits of `brane theories' that describe {\sl large} fluctuations. In particular, supersymmetric sigma-models arise in this way. These lectures discuss the soliton solutions of the associated `brane theories' and their relation to calibrations.1999 Cargese Lectures, 31 pp. Revised version incorporates minor corrections. Second revision corrects misaligned equationHigh Energy Physics - Theorytext