2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149450The existence two S-dual descriptions of (N,1) string bound states suggests that the strong coupling behaviour of electric flux lines in large N 2D SYM theory has a dual description in terms of weakly coupled IIB string theory. In support of this identification, we propose a dual interpretation of the SYM loop equation as a perturbative string Ward identity, expressing the conformal invariance of the corresponding boundary interaction. This correspondence can be viewed as a weak coupling check of the matrix string conjecture.11 pages, latex, no figures, some equations correctedHigh Energy Physics - Theorytext