2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53831We construct a Grassmannian-like formulation for the potential KP-hierarchy including additional ``negative'' flows. Our approach will generalize the notion of a tau-function to include negative flows. We compare the resulting hierarchy with results by Hirota, Satsuma and Bogoyavlenskii.22 pages (LaTeX), Report KITCS94-2-1High Energy Physics - Theorytext