2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93801We present here a simple proof of the non-existence of a non-periodic invariant point for the quantum baker's map propagator presented in Rubin and Salwen (Annals of Physics, 1998), for Planck's constant h=1/N and N a positive integer.3 or 4 pagesQuantum Physicstext