2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/119037One of the most important results of the axiomatic quantum field theory - generalized Haag's theorem - is proven in SO(1,1) invariant quantum field theory, of which an important example is noncommutative quantum field theory. In SO(1,3) invariant theory new consequences of generalized Haag's theorem are obtained: it has been proved that equality of four-point Wightman functions in two theories leads to the equality of elastic scattering amplitudes and total cross-sections in these theories.11 pages, Talk given at the 14th International Seminar on High Energy Physics QUARKS'2006, Repino, St.Petersburg, Russia, May 19-25, 2006High Energy Physics - Theorytext