2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54270Following Sutherland's work on one-dimensional integrable systems we formulate and study its two-dimensional version. Physically it expresses the absence of true 3-body forces among an assembly of N particles leaving exclusively effective 2-body interactions. This criterion may be a suitable candidate for an integrability condition.13 pages,uses LATeX2e and epsf. File prepared using the uufiles packageHigh Energy Physics - Theorytext