2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/217495It is shown that the violation of unitarity observed in space/time noncommutative field theories is due to an improper definition of quantum field theory on noncommutative spacetime.7 pages; typos corrected, sign convention changed on p.2High Energy Physics - TheoryQuantum Algebratext