2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/110004We introduce a formulation of combined systems in orthodox non-relativistic quantum mechanics, mathematically equivalent to the usual one. For context and larger issues, see http://euclid.unh.edu/~jjohnson/axiomatics.html and http://arxiv.org/quant-ph/0502124Mathematical Physicstext