2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94186This paper is concerned with whether or not the preferential gauge can ensure the uniqueness and correctness of results obtained from the standard time-dependent perturbation theory, in which the transition probability is formulated in terms of matrix elements of Hamiltonian.7 pages, O figureQuantum Physicstext