2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/124766We give the mathematical theory of duality computer in the density matrix formalism. This result complements the mathematical theory of duality computer of Gudder in the pure state formalism.3 pages. Typos correctedQuantum PhysicsMathematical Theory of the Duality Computer in the Density Matrix Formalismtext