2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53016We review briefly the spin foam formalism for constructing path integrals for the BF and related theories. Then we describe how the path integral for the string theory on a group manifold can be defined as a two-dimensional spin foam state sum.6 pages, talk given at the Summer School in Modern Mathematical Physics, Zlatibor, 20-31 August, 2004High Energy Physics - Theorytext