2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/150709In these lecture notes, an introduction to superstring theory is presented. Classical strings, covariant and light-cone quantization, supersymmetric strings, anomaly cancelation, compactification, T-duality, supersymmetry breaking, and threshold corrections to low-energy couplings are discussed. A brief introduction to non-perturbative duality symmetries is also included.244 pages, Latex, 22 figures, uuencoded gzipped size of source file+figures ~ .6 Mb. Minor errors and misprints corrected. Version to be published in book form by Leuven University PressHigh Energy Physics - Theorytext