2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/88725The relativistic angular momentum is introduced as an extension of the non-relativistic analysis of allowed states in the phase space for a quantum particle. The paper shows the conceptual basis of the approach. An interesting feature of the present point of view is that the indistinguishability of identical particles and the Pauli principle are found as corollaries.30 pagesQuantum Physicstext