2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/192162The partition function of two dimensional QCD on a Riemann surface of area $A$ is expanded as a power series in $1/N$ and $A$. It is shown that the coefficients of this expansion are precisely determined by a sum over maps from a two dimensional surface onto the two dimensional target space. Thus two dimensional QCD has a simple interpretation as a closed string theory.27 pages, PUPT-1376 LBL-33458High Energy Physics - TheoryHigh Energy Physics - Phenomenologytext