2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54758We give a broad overview of superstring duality, Dirichlet branes, and some implications of both for questions about the structure of space-time at short distances.To appear in the proceedings of the LXIV Les Houches session on `Quantum Symmetries', August 1995. latex, 29 ppHigh Energy Physics - TheorySuperstring Dualities, Dirichlet Branes and the Small Scale Structure of Spacetext