2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55294We discuss the precise relation of the open N=2 string to a self-dual Yang-Mills (SDYM) system in 2+2 dimensions. In particular, we review the description of the string target space action in terms of SDYM in a ``picture hyperspace'' parametrised by the standard vectorial R^{2,2} coordinate together with a commuting spinor of SO(2,2). The component form contains an infinite tower of prepotentials coupled to the one representing the SDYM degree of freedom. The truncation to five fields yields a novel one-loop exact lagrangean field theory.6 pages, LaTeX; contribution to the 31st Ahrenshoop International Symposium on the Theory of Elementary Particles, Buckow, Germany, 2-6 September 1997High Energy Physics - Theorytext