2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/222784We observe that the partition function of the six vertex model on a finite square lattice with domain wall boundary conditions is (a restriction of) a KP tau function and express it as an expectation value of charged free fermions (up to an overall normalization).16 pages, LaTeX2eMathematical Physicstext